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cmd/compile: ARM comparisons with 0 incorrect on overflow

Browse source 
Some ARM rewriting rules convert 'comparing to zero' conditions of if
statements to a simplified version utilizing CMN and CMP instructions to
branch over condition flags, in order to save one Add or Sub caculation.

Such optimizations lead to wrong branching in case an overflow/underflow
occurs when executing CMN or CMP.

Fix the issue by introducing new block opcodes that don't honor the
overflow/underflow flag:

  Block-Op         Meaning                   ARM condition codes
  1. LTnoov        less than                 MI
  2. GEnoov        greater than or equal     PL
  3. LEnoov        less than or equal        MI || EQ
  4. GTnoov        greater than              NEQ & PL

The patch also adds a few test cases to cover scenarios that are specific
to ARM and fine-tunes the code generation tests for 'x-const'.

For more details please refer to the previous fix on 64-bit ARM:
  https://go-review.googlesource.com/c/go/+/233097

Go1 perf, 'old' is the non-optimized version, that is removing all concerned
rewriting rules.

name                     old time/op    new time/op     delta
BinaryTree17-8              7.73s ± 0%      7.81s ± 0%  +0.97%  (p=0.000 n=7+8)
Fannkuch11-8                7.06s ± 0%      7.00s ± 0%  -0.83%  (p=0.000 n=8+8)
FmtFprintfEmpty-8           181ns ± 1%      183ns ± 1%  +1.31%  (p=0.001 n=8+8)
FmtFprintfString-8          319ns ± 1%      325ns ± 2%  +1.71%  (p=0.009 n=7+8)
FmtFprintfInt-8             358ns ± 1%      359ns ± 1%    ~     (p=0.293 n=7+7)
FmtFprintfIntInt-8          459ns ± 3%      456ns ± 1%    ~     (p=0.869 n=8+8)
FmtFprintfPrefixedInt-8     535ns ± 4%      538ns ± 4%    ~     (p=0.572 n=8+8)
FmtFprintfFloat-8          1.01µs ± 2%     1.01µs ± 2%    ~     (p=0.625 n=8+8)
FmtManyArgs-8              1.93µs ± 2%     1.93µs ± 1%    ~     (p=0.979 n=8+7)
GobDecode-8                16.1ms ± 1%     16.5ms ± 1%  +2.32%  (p=0.000 n=8+8)
GobEncode-8                15.9ms ± 0%     15.8ms ± 1%  -1.00%  (p=0.000 n=8+7)
Gzip-8                      690ms ± 1%      670ms ± 0%  -2.90%  (p=0.000 n=8+8)
Gunzip-8                    109ms ± 1%      109ms ± 1%    ~     (p=0.694 n=7+8)
HTTPClientServer-8          149µs ± 3%      146µs ± 2%  -1.70%  (p=0.028 n=8+8)
JSONEncode-8               50.5ms ± 1%     49.2ms ± 0%  -2.60%  (p=0.001 n=7+7)
JSONDecode-8                135ms ± 2%      137ms ± 1%    ~     (p=0.054 n=8+7)
Mandelbrot200-8             951ms ± 0%      952ms ± 0%    ~     (p=0.852 n=6+8)
GoParse-8                  9.47ms ± 1%     9.66ms ± 1%  +2.01%  (p=0.000 n=8+8)
RegexpMatchEasy0_32-8       288ns ± 2%      277ns ± 2%  -3.61%  (p=0.000 n=8+8)
RegexpMatchEasy0_1K-8      1.66µs ± 1%     1.69µs ± 2%  +2.21%  (p=0.001 n=7+7)
RegexpMatchEasy1_32-8       334ns ± 1%      305ns ± 2%  -8.86%  (p=0.000 n=8+8)
RegexpMatchEasy1_1K-8      2.14µs ± 2%     2.15µs ± 0%    ~     (p=0.099 n=8+8)
RegexpMatchMedium_32-8     13.3ns ± 1%     13.3ns ± 0%    ~     (p=1.000 n=7+7)
RegexpMatchMedium_1K-8     81.1µs ± 3%     80.7µs ± 1%    ~     (p=0.955 n=7+8)
RegexpMatchHard_32-8       4.26µs ± 0%     4.26µs ± 0%    ~     (p=0.933 n=7+8)
RegexpMatchHard_1K-8        124µs ± 0%      124µs ± 0%  +0.31%  (p=0.000 n=8+8)
Revcomp-8                  14.7ms ± 2%     14.5ms ± 1%  -1.66%  (p=0.003 n=8+8)
Template-8                  197ms ± 2%      200ms ± 3%  +1.62%  (p=0.021 n=8+8)
TimeParse-8                1.33µs ± 1%     1.30µs ± 1%  -1.86%  (p=0.002 n=8+8)
TimeFormat-8               3.04µs ± 1%     3.02µs ± 0%  -0.60%  (p=0.000 n=8+8)

name                     old speed      new speed       delta
GobDecode-8              47.6MB/s ± 1%   46.5MB/s ± 1%  -2.28%  (p=0.000 n=8+8)
GobEncode-8              48.1MB/s ± 0%   48.6MB/s ± 1%  +1.02%  (p=0.000 n=8+7)
Gzip-8                   28.1MB/s ± 1%   29.0MB/s ± 0%  +2.97%  (p=0.000 n=8+8)
Gunzip-8                  178MB/s ± 1%    179MB/s ± 2%    ~     (p=0.694 n=7+8)
JSONEncode-8             38.4MB/s ± 1%   39.4MB/s ± 0%  +2.67%  (p=0.001 n=7+7)
JSONDecode-8             14.3MB/s ± 2%   14.2MB/s ± 1%  -0.81%  (p=0.043 n=8+7)
GoParse-8                6.12MB/s ± 1%   5.99MB/s ± 1%  -2.00%  (p=0.000 n=8+8)
RegexpMatchEasy0_32-8     111MB/s ± 2%    115MB/s ± 2%  +3.77%  (p=0.000 n=8+8)
RegexpMatchEasy0_1K-8     618MB/s ± 1%    604MB/s ± 2%  -2.16%  (p=0.001 n=7+7)
RegexpMatchEasy1_32-8    95.7MB/s ± 1%  105.1MB/s ± 2%  +9.76%  (p=0.000 n=8+8)
RegexpMatchEasy1_1K-8     479MB/s ± 2%    477MB/s ± 0%    ~     (p=0.105 n=8+8)
RegexpMatchMedium_32-8   75.2MB/s ± 1%   75.2MB/s ± 0%    ~     (p=0.247 n=7+7)
RegexpMatchMedium_1K-8   12.6MB/s ± 3%   12.7MB/s ± 1%    ~     (p=0.538 n=7+8)
RegexpMatchHard_32-8     7.52MB/s ± 0%   7.52MB/s ± 0%    ~     (p=0.968 n=7+8)
RegexpMatchHard_1K-8     8.26MB/s ± 0%   8.24MB/s ± 0%  -0.30%  (p=0.001 n=8+8)
Revcomp-8                 173MB/s ± 2%    176MB/s ± 1%  +1.68%  (p=0.003 n=8+8)
Template-8               9.85MB/s ± 2%   9.69MB/s ± 3%  -1.59%  (p=0.021 n=8+8)

Fixes   #39303
Updates #38740

Change-Id: I0a5f87bfda679f66414c0041ace2ca2e28363f36
Reviewed-on: https://go-review.googlesource.com/c/go/+/236637
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Xiangdong Ji 2020-06-01 11:01:14 +00:00 • committed by Keith Randall
parent bdcf33f1c0
commit e031318ca6
8 changed files with 418 additions and 259 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/cmd/compile/fmtmap_test.go
View file

@ -140,6 +140,7 @@ var knownFormats = map[string]string{
"float64 %.3f": "", "float64 %.3f": "",
"float64 %.6g": "", "float64 %.6g": "",
"float64 %g": "", "float64 %g": "",
"int %#x": "",
"int %-12d": "", "int %-12d": "",
"int %-6d": "", "int %-6d": "",
"int %-8o": "", "int %-8o": "",
@ -203,6 +204,7 @@ var knownFormats = map[string]string{
"uint64 %b": "", "uint64 %b": "",
"uint64 %d": "", "uint64 %d": "",
"uint64 %x": "", "uint64 %x": "",
"uint8 %#x": "",
"uint8 %d": "", "uint8 %d": "",
"uint8 %v": "", "uint8 %v": "",
"uint8 %x": "", "uint8 %x": "",

23
src/cmd/compile/internal/arm/ssa.go
View file

@ -898,6 +898,20 @@ var blockJump = map[ssa.BlockKind]struct {
ssa.BlockARMUGE: {arm.ABHS, arm.ABLO}, ssa.BlockARMUGE: {arm.ABHS, arm.ABLO},
ssa.BlockARMUGT: {arm.ABHI, arm.ABLS}, ssa.BlockARMUGT: {arm.ABHI, arm.ABLS},
ssa.BlockARMULE: {arm.ABLS, arm.ABHI}, ssa.BlockARMULE: {arm.ABLS, arm.ABHI},
ssa.BlockARMLTnoov: {arm.ABMI, arm.ABPL},
ssa.BlockARMGEnoov: {arm.ABPL, arm.ABMI},
}
// To model a 'LEnoov' ('<=' without overflow checking) branching
var leJumps = [2][2]gc.IndexJump{
{{Jump: arm.ABEQ, Index: 0}, {Jump: arm.ABPL, Index: 1}}, // next == b.Succs[0]
{{Jump: arm.ABMI, Index: 0}, {Jump: arm.ABEQ, Index: 0}}, // next == b.Succs[1]
}
// To model a 'GTnoov' ('>' without overflow checking) branching
var gtJumps = [2][2]gc.IndexJump{
{{Jump: arm.ABMI, Index: 1}, {Jump: arm.ABEQ, Index: 1}}, // next == b.Succs[0]
{{Jump: arm.ABEQ, Index: 1}, {Jump: arm.ABPL, Index: 0}}, // next == b.Succs[1]
} }
func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) { func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) {
@ -941,7 +955,8 @@ func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) {
ssa.BlockARMLT, ssa.BlockARMGE, ssa.BlockARMLT, ssa.BlockARMGE,
ssa.BlockARMLE, ssa.BlockARMGT, ssa.BlockARMLE, ssa.BlockARMGT,
ssa.BlockARMULT, ssa.BlockARMUGT, ssa.BlockARMULT, ssa.BlockARMUGT,
ssa.BlockARMULE, ssa.BlockARMUGE: ssa.BlockARMULE, ssa.BlockARMUGE,
ssa.BlockARMLTnoov, ssa.BlockARMGEnoov:
jmp := blockJump[b.Kind] jmp := blockJump[b.Kind]
switch next { switch next {
case b.Succs[0].Block(): case b.Succs[0].Block():
@ -958,6 +973,12 @@ func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) {
} }
} }
case ssa.BlockARMLEnoov:
s.CombJump(b, next, &leJumps)
case ssa.BlockARMGTnoov:
s.CombJump(b, next, &gtJumps)
default: default:
b.Fatalf("branch not implemented: %s", b.LongString()) b.Fatalf("branch not implemented: %s", b.LongString())
} }

148
src/cmd/compile/internal/ssa/gen/ARM.rules
View file

@ -704,6 +704,10 @@
(UGE (InvertFlags cmp) yes no) -> (ULE cmp yes no) (UGE (InvertFlags cmp) yes no) -> (ULE cmp yes no)
(EQ (InvertFlags cmp) yes no) -> (EQ cmp yes no) (EQ (InvertFlags cmp) yes no) -> (EQ cmp yes no)
(NE (InvertFlags cmp) yes no) -> (NE cmp yes no) (NE (InvertFlags cmp) yes no) -> (NE cmp yes no)
(LTnoov (InvertFlags cmp) yes no) => (GTnoov cmp yes no)
(GEnoov (InvertFlags cmp) yes no) => (LEnoov cmp yes no)
(LEnoov (InvertFlags cmp) yes no) => (GEnoov cmp yes no)
(GTnoov (InvertFlags cmp) yes no) => (LTnoov cmp yes no)
// absorb flag constants into boolean values // absorb flag constants into boolean values
(Equal (FlagEQ)) -> (MOVWconst [1]) (Equal (FlagEQ)) -> (MOVWconst [1])
@ -1417,42 +1421,42 @@
(NE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (NE (TEQshiftLLreg x y z) yes no) (NE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (NE (TEQshiftLLreg x y z) yes no)
(NE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (NE (TEQshiftRLreg x y z) yes no) (NE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (NE (TEQshiftRLreg x y z) yes no)
(NE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (NE (TEQshiftRAreg x y z) yes no) (NE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (NE (TEQshiftRAreg x y z) yes no)
(LT (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (LT (CMP x y) yes no) (LT (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (LTnoov (CMP x y) yes no)
(LT (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (LT (CMP a (MUL <x.Type> x y)) yes no) (LT (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (LTnoov (CMP a (MUL <x.Type> x y)) yes no)
(LT (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (LT (CMPconst [c] x) yes no) (LT (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (LTnoov (CMPconst [c] x) yes no)
(LT (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (LT (CMPshiftLL x y [c]) yes no) (LT (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (LTnoov (CMPshiftLL x y [c]) yes no)
(LT (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (LT (CMPshiftRL x y [c]) yes no) (LT (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (LTnoov (CMPshiftRL x y [c]) yes no)
(LT (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (LT (CMPshiftRA x y [c]) yes no) (LT (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (LTnoov (CMPshiftRA x y [c]) yes no)
(LT (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (LT (CMPshiftLLreg x y z) yes no) (LT (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (CMPshiftLLreg x y z) yes no)
(LT (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (LT (CMPshiftRLreg x y z) yes no) (LT (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (CMPshiftRLreg x y z) yes no)
(LT (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (LT (CMPshiftRAreg x y z) yes no) (LT (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (LTnoov (CMPshiftRAreg x y z) yes no)
(LE (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (LE (CMP x y) yes no) (LE (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (LEnoov (CMP x y) yes no)
(LE (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (LE (CMP a (MUL <x.Type> x y)) yes no) (LE (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (LEnoov (CMP a (MUL <x.Type> x y)) yes no)
(LE (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (LE (CMPconst [c] x) yes no) (LE (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (LEnoov (CMPconst [c] x) yes no)
(LE (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (LE (CMPshiftLL x y [c]) yes no) (LE (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (LEnoov (CMPshiftLL x y [c]) yes no)
(LE (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (LE (CMPshiftRL x y [c]) yes no) (LE (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (LEnoov (CMPshiftRL x y [c]) yes no)
(LE (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (LE (CMPshiftRA x y [c]) yes no) (LE (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (LEnoov (CMPshiftRA x y [c]) yes no)
(LE (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (LE (CMPshiftLLreg x y z) yes no) (LE (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMPshiftLLreg x y z) yes no)
(LE (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (LE (CMPshiftRLreg x y z) yes no) (LE (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMPshiftRLreg x y z) yes no)
(LE (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (LE (CMPshiftRAreg x y z) yes no) (LE (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMPshiftRAreg x y z) yes no)
(LT (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (LT (CMN x y) yes no) (LT (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (LTnoov (CMN x y) yes no)
(LT (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (LT (CMN a (MUL <x.Type> x y)) yes no) (LT (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (LTnoov (CMN a (MUL <x.Type> x y)) yes no)
(LT (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (LT (CMNconst [c] x) yes no) (LT (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (LTnoov (CMNconst [c] x) yes no)
(LT (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (LT (CMNshiftLL x y [c]) yes no) (LT (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (LTnoov (CMNshiftLL x y [c]) yes no)
(LT (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (LT (CMNshiftRL x y [c]) yes no) (LT (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (LTnoov (CMNshiftRL x y [c]) yes no)
(LT (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (LT (CMNshiftRA x y [c]) yes no) (LT (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (LTnoov (CMNshiftRA x y [c]) yes no)
(LT (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LT (CMNshiftLLreg x y z) yes no) (LT (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (CMNshiftLLreg x y z) yes no)
(LT (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LT (CMNshiftRLreg x y z) yes no) (LT (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LTnoov (CMNshiftRLreg x y z) yes no)
(LT (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LT (CMNshiftRAreg x y z) yes no) (LT (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LTnoov (CMNshiftRAreg x y z) yes no)
(LE (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (LE (CMN x y) yes no) (LE (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (LEnoov (CMN x y) yes no)
(LE (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (LE (CMN a (MUL <x.Type> x y)) yes no) (LE (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (LEnoov (CMN a (MUL <x.Type> x y)) yes no)
(LE (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (LE (CMNconst [c] x) yes no) (LE (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (LEnoov (CMNconst [c] x) yes no)
(LE (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (LE (CMNshiftLL x y [c]) yes no) (LE (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (LEnoov (CMNshiftLL x y [c]) yes no)
(LE (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (LE (CMNshiftRL x y [c]) yes no) (LE (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (LEnoov (CMNshiftRL x y [c]) yes no)
(LE (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (LE (CMNshiftRA x y [c]) yes no) (LE (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (LEnoov (CMNshiftRA x y [c]) yes no)
(LE (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LE (CMNshiftLLreg x y z) yes no) (LE (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMNshiftLLreg x y z) yes no)
(LE (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LE (CMNshiftRLreg x y z) yes no) (LE (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMNshiftRLreg x y z) yes no)
(LE (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LE (CMNshiftRAreg x y z) yes no) (LE (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (LEnoov (CMNshiftRAreg x y z) yes no)
(LT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (LT (TST x y) yes no) (LT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (LT (TST x y) yes no)
(LT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (LT (TSTconst [c] x) yes no) (LT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (LT (TSTconst [c] x) yes no)
(LT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (LT (TSTshiftLL x y [c]) yes no) (LT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (LT (TSTshiftLL x y [c]) yes no)
@ -1485,43 +1489,43 @@
(LE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftLLreg x y z) yes no) (LE (CMPconst [0] l:(XORshiftLLreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftLLreg x y z) yes no)
(LE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftRLreg x y z) yes no) (LE (CMPconst [0] l:(XORshiftRLreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftRLreg x y z) yes no)
(LE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftRAreg x y z) yes no) (LE (CMPconst [0] l:(XORshiftRAreg x y z)) yes no) && l.Uses==1 -> (LE (TEQshiftRAreg x y z) yes no)
(GT (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (GT (CMP x y) yes no) (GT (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (GTnoov (CMP x y) yes no)
(GT (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (GT (CMP a (MUL <x.Type> x y)) yes no) (GT (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (GTnoov (CMP a (MUL <x.Type> x y)) yes no)
(GT (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (GT (CMPconst [c] x) yes no) (GT (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (GTnoov (CMPconst [c] x) yes no)
(GT (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (GT (CMPshiftLL x y [c]) yes no) (GT (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (GTnoov (CMPshiftLL x y [c]) yes no)
(GT (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (GT (CMPshiftRL x y [c]) yes no) (GT (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (GTnoov (CMPshiftRL x y [c]) yes no)
(GT (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (GT (CMPshiftRA x y [c]) yes no) (GT (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (GTnoov (CMPshiftRA x y [c]) yes no)
(GT (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (GT (CMPshiftLLreg x y z) yes no) (GT (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (CMPshiftLLreg x y z) yes no)
(GT (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (GT (CMPshiftRLreg x y z) yes no) (GT (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (CMPshiftRLreg x y z) yes no)
(GT (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (GT (CMPshiftRAreg x y z) yes no) (GT (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (GTnoov (CMPshiftRAreg x y z) yes no)
(GE (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (GE (CMP x y) yes no) (GE (CMPconst [0] l:(SUB x y)) yes no) && l.Uses==1 -> (GEnoov (CMP x y) yes no)
(GE (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (GE (CMP a (MUL <x.Type> x y)) yes no) (GE (CMPconst [0] l:(MULS x y a)) yes no) && l.Uses==1 -> (GEnoov (CMP a (MUL <x.Type> x y)) yes no)
(GE (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (GE (CMPconst [c] x) yes no) (GE (CMPconst [0] l:(SUBconst [c] x)) yes no) && l.Uses==1 -> (GEnoov (CMPconst [c] x) yes no)
(GE (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (GE (CMPshiftLL x y [c]) yes no) (GE (CMPconst [0] l:(SUBshiftLL x y [c])) yes no) && l.Uses==1 -> (GEnoov (CMPshiftLL x y [c]) yes no)
(GE (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (GE (CMPshiftRL x y [c]) yes no) (GE (CMPconst [0] l:(SUBshiftRL x y [c])) yes no) && l.Uses==1 -> (GEnoov (CMPshiftRL x y [c]) yes no)
(GE (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (GE (CMPshiftRA x y [c]) yes no) (GE (CMPconst [0] l:(SUBshiftRA x y [c])) yes no) && l.Uses==1 -> (GEnoov (CMPshiftRA x y [c]) yes no)
(GE (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (GE (CMPshiftLLreg x y z) yes no) (GE (CMPconst [0] l:(SUBshiftLLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMPshiftLLreg x y z) yes no)
(GE (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (GE (CMPshiftRLreg x y z) yes no) (GE (CMPconst [0] l:(SUBshiftRLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMPshiftRLreg x y z) yes no)
(GE (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (GE (CMPshiftRAreg x y z) yes no) (GE (CMPconst [0] l:(SUBshiftRAreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMPshiftRAreg x y z) yes no)
(GT (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (GT (CMN x y) yes no) (GT (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (GTnoov (CMN x y) yes no)
(GT (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (GT (CMNconst [c] x) yes no) (GT (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (GTnoov (CMNconst [c] x) yes no)
(GT (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (GT (CMNshiftLL x y [c]) yes no) (GT (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (GTnoov (CMNshiftLL x y [c]) yes no)
(GT (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (GT (CMNshiftRL x y [c]) yes no) (GT (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (GTnoov (CMNshiftRL x y [c]) yes no)
(GT (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (GT (CMNshiftRA x y [c]) yes no) (GT (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (GTnoov (CMNshiftRA x y [c]) yes no)
(GT (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GT (CMNshiftLLreg x y z) yes no) (GT (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (CMNshiftLLreg x y z) yes no)
(GT (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GT (CMNshiftRLreg x y z) yes no) (GT (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GTnoov (CMNshiftRLreg x y z) yes no)
(GT (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GT (CMNshiftRAreg x y z) yes no) (GT (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GTnoov (CMNshiftRAreg x y z) yes no)
(GE (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (GE (CMN x y) yes no) (GE (CMPconst [0] l:(ADD x y)) yes no) && l.Uses==1 -> (GEnoov (CMN x y) yes no)
(GE (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (GE (CMN a (MUL <x.Type> x y)) yes no) (GE (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (GEnoov (CMN a (MUL <x.Type> x y)) yes no)
(GE (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (GE (CMNconst [c] x) yes no) (GE (CMPconst [0] l:(ADDconst [c] x)) yes no) && l.Uses==1 -> (GEnoov (CMNconst [c] x) yes no)
(GE (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (GE (CMNshiftLL x y [c]) yes no) (GE (CMPconst [0] l:(ADDshiftLL x y [c])) yes no) && l.Uses==1 -> (GEnoov (CMNshiftLL x y [c]) yes no)
(GE (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (GE (CMNshiftRL x y [c]) yes no) (GE (CMPconst [0] l:(ADDshiftRL x y [c])) yes no) && l.Uses==1 -> (GEnoov (CMNshiftRL x y [c]) yes no)
(GE (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (GE (CMNshiftRA x y [c]) yes no) (GE (CMPconst [0] l:(ADDshiftRA x y [c])) yes no) && l.Uses==1 -> (GEnoov (CMNshiftRA x y [c]) yes no)
(GE (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GE (CMNshiftLLreg x y z) yes no) (GE (CMPconst [0] l:(ADDshiftLLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMNshiftLLreg x y z) yes no)
(GE (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GE (CMNshiftRLreg x y z) yes no) (GE (CMPconst [0] l:(ADDshiftRLreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMNshiftRLreg x y z) yes no)
(GE (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GE (CMNshiftRAreg x y z) yes no) (GE (CMPconst [0] l:(ADDshiftRAreg x y z)) yes no) && l.Uses==1 -> (GEnoov (CMNshiftRAreg x y z) yes no)
(GT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (GT (TST x y) yes no) (GT (CMPconst [0] l:(AND x y)) yes no) && l.Uses==1 -> (GT (TST x y) yes no)
(GT (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (GT (CMN a (MUL <x.Type> x y)) yes no) (GT (CMPconst [0] l:(MULA x y a)) yes no) && l.Uses==1 -> (GTnoov (CMN a (MUL <x.Type> x y)) yes no)
(GT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (GT (TSTconst [c] x) yes no) (GT (CMPconst [0] l:(ANDconst [c] x)) yes no) && l.Uses==1 -> (GT (TSTconst [c] x) yes no)
(GT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (GT (TSTshiftLL x y [c]) yes no) (GT (CMPconst [0] l:(ANDshiftLL x y [c])) yes no) && l.Uses==1 -> (GT (TSTshiftLL x y [c]) yes no)
(GT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (GT (TSTshiftRL x y [c]) yes no) (GT (CMPconst [0] l:(ANDshiftRL x y [c])) yes no) && l.Uses==1 -> (GT (TSTshiftRL x y [c]) yes no)

4
src/cmd/compile/internal/ssa/gen/ARMOps.go
View file

@ -584,6 +584,10 @@ func init() {
{name: "ULE", controls: 1}, {name: "ULE", controls: 1},
{name: "UGT", controls: 1}, {name: "UGT", controls: 1},
{name: "UGE", controls: 1}, {name: "UGE", controls: 1},
{name: "LTnoov", controls: 1}, // 'LT' but without honoring overflow
{name: "LEnoov", controls: 1}, // 'LE' but without honoring overflow
{name: "GTnoov", controls: 1}, // 'GT' but without honoring overflow
{name: "GEnoov", controls: 1}, // 'GE' but without honoring overflow
} }
archs = append(archs, arch{ archs = append(archs, arch{

8
src/cmd/compile/internal/ssa/opGen.go
View file

@ -61,6 +61,10 @@ const (
BlockARMULE BlockARMULE
BlockARMUGT BlockARMUGT
BlockARMUGE BlockARMUGE
BlockARMLTnoov
BlockARMLEnoov
BlockARMGTnoov
BlockARMGEnoov
BlockARM64EQ BlockARM64EQ
BlockARM64NE BlockARM64NE
@ -195,6 +199,10 @@ var blockString = [...]string{
BlockARMULE: "ULE", BlockARMULE: "ULE",
BlockARMUGT: "UGT", BlockARMUGT: "UGT",
BlockARMUGE: "UGE", BlockARMUGE: "UGE",
BlockARMLTnoov: "LTnoov",
BlockARMLEnoov: "LEnoov",
BlockARMGTnoov: "GTnoov",
BlockARMGEnoov: "GEnoov",
BlockARM64EQ: "EQ", BlockARM64EQ: "EQ",
BlockARM64NE: "NE", BlockARM64NE: "NE",

324
src/cmd/compile/internal/ssa/rewriteARM.go
View file

File diff suppressed because it is too large Load diff

69
src/cmd/compile/internal/ssa/rewriteCond_test.go
View file

@ -7,7 +7,6 @@ package ssa
import ( import (
"math" "math"
"math/rand" "math/rand"
"runtime"
"testing" "testing"
) )
@ -18,6 +17,7 @@ var (
y64 int64 = math.MinInt64 + 1 y64 int64 = math.MinInt64 + 1
x32 int32 = math.MaxInt32 - 2 x32 int32 = math.MaxInt32 - 2
x32b int32 = math.MaxInt32 - 2 x32b int32 = math.MaxInt32 - 2
x32c int32 = math.MaxInt32 - 2
y32 int32 = math.MinInt32 + 1 y32 int32 = math.MinInt32 + 1
one64 int64 = 1 one64 int64 = 1
one32 int32 = 1 one32 int32 = 1
@ -25,6 +25,8 @@ var (
v64_n int64 = -11 v64_n int64 = -11
v32 int32 = 11 v32 int32 = 11
v32_n int32 = -11 v32_n int32 = -11
uv32 uint32 = 19
uz uint8 = 1 // for lowering to SLL/SRL/SRA
) )
var crTests = []struct { var crTests = []struct {
@ -39,6 +41,8 @@ var crTests = []struct {
{"MAddVar32", testMAddVar32}, {"MAddVar32", testMAddVar32},
{"MSubVar64", testMSubVar64}, {"MSubVar64", testMSubVar64},
{"MSubVar32", testMSubVar32}, {"MSubVar32", testMSubVar32},
{"AddShift32", testAddShift32},
{"SubShift32", testSubShift32},
} }
var crBenches = []struct { var crBenches = []struct {
@ -58,9 +62,6 @@ var crBenches = []struct {
// and machine code sequences are covered. // and machine code sequences are covered.
// It's for arm64 initially, please see https://github.com/golang/go/issues/38740 // It's for arm64 initially, please see https://github.com/golang/go/issues/38740
func TestCondRewrite(t *testing.T) { func TestCondRewrite(t *testing.T) {
if runtime.GOARCH == "arm" {
t.Skip("fix on arm expected!")
}
for _, test := range crTests { for _, test := range crTests {
t.Run(test.name, test.tf) t.Run(test.name, test.tf)
} }
@ -408,6 +409,66 @@ func testMSubVar32(t *testing.T) {
} }
} }
// 32-bit ADDshift, pick up 1~2 scenarios randomly for each condition
func testAddShift32(t *testing.T) {
if x32+v32<<1 < 0 {
} else {
t.Errorf("'%#x + %#x<<%#x < 0' failed", x32, v32, 1)
}
if x32+v32>>1 <= 0 {
} else {
t.Errorf("'%#x + %#x>>%#x <= 0' failed", x32, v32, 1)
}
if x32+int32(uv32>>1) > 0 {
t.Errorf("'%#x + int32(%#x>>%#x) > 0' failed", x32, uv32, 1)
}
if x32+v32<<uz >= 0 {
t.Errorf("'%#x + %#x<<%#x >= 0' failed", x32, v32, uz)
}
if x32+v32>>uz > 0 {
t.Errorf("'%#x + %#x>>%#x > 0' failed", x32, v32, uz)
}
if x32+int32(uv32>>uz) < 0 {
} else {
t.Errorf("'%#x + int32(%#x>>%#x) < 0' failed", x32, uv32, uz)
}
}
// 32-bit SUBshift, pick up 1~2 scenarios randomly for each condition
func testSubShift32(t *testing.T) {
if y32-v32<<1 > 0 {
} else {
t.Errorf("'%#x - %#x<<%#x > 0' failed", y32, v32, 1)
}
if y32-v32>>1 < 0 {
t.Errorf("'%#x - %#x>>%#x < 0' failed", y32, v32, 1)
}
if y32-int32(uv32>>1) >= 0 {
} else {
t.Errorf("'%#x - int32(%#x>>%#x) >= 0' failed", y32, uv32, 1)
}
if y32-v32<<uz < 0 {
t.Errorf("'%#x - %#x<<%#x < 0' failed", y32, v32, uz)
}
if y32-v32>>uz >= 0 {
} else {
t.Errorf("'%#x - %#x>>%#x >= 0' failed", y32, v32, uz)
}
if y32-int32(uv32>>uz) <= 0 {
t.Errorf("'%#x - int32(%#x>>%#x) <= 0' failed", y32, uv32, uz)
}
}
var rnd = rand.New(rand.NewSource(0)) var rnd = rand.New(rand.NewSource(0))
var sink int64 var sink int64

33
test/codegen/comparisons.go
View file

@ -253,6 +253,8 @@ func CmpLogicalToZero(a, b, c uint32, d, e uint64) uint64 {
// 'comparing to zero' expressions // 'comparing to zero' expressions
// var + const // var + const
// 'x-const' might be canonicalized to 'x+(-const)', so we check both
// CMN and CMP for subtraction expressions to make the pattern robust.
func CmpToZero_ex1(a int64, e int32) int { func CmpToZero_ex1(a int64, e int32) int {
// arm64:`CMN`,-`ADD`,`(BMI|BPL)` // arm64:`CMN`,-`ADD`,`(BMI|BPL)`
if a+3 < 0 { if a+3 < 0 {
@ -269,37 +271,41 @@ func CmpToZero_ex1(a int64, e int32) int {
return 2 return 2
} }
// arm64:`CMP`,-`SUB`,`(BMI|BPL)` // arm64:`CMP|CMN`,-`(ADD|SUB)`,`(BMI|BPL)`
if a-7 < 0 { if a-7 < 0 {
return 3 return 3
} }
// arm64:`CMP`,-`SUB`,`(BMI|BPL)` // arm64:`CMP|CMN`,-`(ADD|SUB)`,`(BMI|BPL)`
if a-11 >= 0 { if a-11 >= 0 {
return 4 return 4
} }
// arm64:`CMP`,-`SUB`,`BEQ`,`(BMI|BPL)` // arm64:`CMP|CMN`,-`(ADD|SUB)`,`BEQ`,`(BMI|BPL)`
if a-19 > 0 { if a-19 > 0 {
return 4 return 4
} }
// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)` // arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
// arm:`CMN`,-`ADD`,`(BMI|BPL)`
if e+3 < 0 { if e+3 < 0 {
return 5 return 5
} }
// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)` // arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
// arm:`CMN`,-`ADD`,`(BMI|BPL)`
if e+13 >= 0 { if e+13 >= 0 {
return 6 return 6
} }
// arm64:`CMPW`,-`SUBW`,`(BMI|BPL)` // arm64:`CMPW|CMNW`,`(BMI|BPL)`
// arm:`CMP|CMN`, -`(ADD|SUB)`, `(BMI|BPL)`
if e-7 < 0 { if e-7 < 0 {
return 7 return 7
} }
// arm64:`CMPW`,-`SUBW`,`(BMI|BPL)` // arm64:`CMPW|CMNW`,`(BMI|BPL)`
// arm:`CMP|CMN`, -`(ADD|SUB)`, `(BMI|BPL)`
if e-11 >= 0 { if e-11 >= 0 {
return 8 return 8
} }
@ -326,11 +332,13 @@ func CmpToZero_ex2(a, b, c int64, e, f, g int32) int {
} }
// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)` // arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
// arm:`CMN`,-`ADD`,`(BMI|BPL)`
if e+f < 0 { if e+f < 0 {
return 5 return 5
} }
// arm64:`CMNW`,-`ADDW`,`(BMI|BPL)` // arm64:`CMNW`,-`ADDW`,`(BMI|BPL)`
// arm:`CMN`,-`ADD`,`(BMI|BPL)`
if f+g >= 0 { if f+g >= 0 {
return 6 return 6
} }
@ -350,11 +358,13 @@ func CmpToZero_ex3(a, b, c, d int64, e, f, g, h int32) int {
} }
// arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)` // arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)`
// arm:`CMN`,-`MULA`,`MUL`,`BEQ`,`(BMI|BPL)`
if e+f*g > 0 { if e+f*g > 0 {
return 5 return 5
} }
// arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)` // arm64:`CMNW`,-`MADDW`,`MULW`,`BEQ`,`(BMI|BPL)`
// arm:`CMN`,-`MULA`,`MUL`,`BEQ`,`(BMI|BPL)`
if f+g*h <= 0 { if f+g*h <= 0 {
return 6 return 6
} }
@ -384,3 +394,16 @@ func CmpToZero_ex4(a, b, c, d int64, e, f, g, h int32) int {
} }
return 0 return 0
} }
func CmpToZero_ex5(e, f int32, u uint32) int {
// arm:`CMN`,-`ADD`,`BEQ`,`(BMI|BPL)`
if e+f<<1 > 0 {
return 1
}
// arm:`CMP`,-`SUB`,`(BMI|BPL)`
if f-int32(u>>2) >= 0 {
return 2
}
return 0
}