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cmd/compile: added some intrinsics to SSA back end

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One intrinsic was needed to help get the very best
performance out of a future GC; as long as that one was
being added, I also added Bswap since that is sometimes
a handy thing to have.  I had intended to fill out the
bit-scan intrinsic family, but the mismatch between the
"scan forward" instruction and "count leading zeroes"
was large enough to cause me to leave it out -- it poses
a dilemma that I'd rather dodge right now.

These intrinsics are not exposed for general use.
That's a separate issue requiring an API proposal change
( https://github.com/golang/proposal )

All intrinsics are tested, both that they are substituted
on the appropriate architecture, and that they produce the
expected result.

Change-Id: I5848037cfd97de4f75bdc33bdd89bba00af4a8ee
Reviewed-on: https://go-review.googlesource.com/20564
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
David Chase 2016-03-11 00:10:52 -05:00
parent 2e90192b0e
commit 8eec2bbfbc
15 changed files with 1143 additions and 36 deletions
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36
src/cmd/compile/internal/amd64/ssa.go
View file

@ -477,6 +477,33 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
p.From.Offset = v.AuxInt2Int64()
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpAMD64CMOVQEQconst, ssa.OpAMD64CMOVLEQconst, ssa.OpAMD64CMOVWEQconst,
ssa.OpAMD64CMOVQNEconst, ssa.OpAMD64CMOVLNEconst, ssa.OpAMD64CMOVWNEconst:
r := gc.SSARegNum(v)
x := gc.SSARegNum(v.Args[0])
// Arg0 is in/out, move in to out if not already same
if r != x {
p := gc.Prog(moveByType(v.Type))
p.From.Type = obj.TYPE_REG
p.From.Reg = x
p.To.Type = obj.TYPE_REG
p.To.Reg = r
}
// Constant into AX, after arg0 movement in case arg0 is in AX
p := gc.Prog(moveByType(v.Type))
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt2Int64()
p.To.Type = obj.TYPE_REG
p.To.Reg = x86.REG_AX
p = gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = x86.REG_AX
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpAMD64MULQconst, ssa.OpAMD64MULLconst, ssa.OpAMD64MULWconst, ssa.OpAMD64MULBconst:
r := gc.SSARegNum(v)
x := gc.SSARegNum(v.Args[0])
@ -955,6 +982,7 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
gc.Maxarg = v.AuxInt
}
case ssa.OpAMD64NEGQ, ssa.OpAMD64NEGL, ssa.OpAMD64NEGW, ssa.OpAMD64NEGB,
ssa.OpAMD64BSWAPQ, ssa.OpAMD64BSWAPL,
ssa.OpAMD64NOTQ, ssa.OpAMD64NOTL, ssa.OpAMD64NOTW, ssa.OpAMD64NOTB:
x := gc.SSARegNum(v.Args[0])
r := gc.SSARegNum(v)
@ -968,7 +996,9 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
p := gc.Prog(v.Op.Asm())
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpAMD64SQRTSD:
case ssa.OpAMD64BSFQ, ssa.OpAMD64BSFL, ssa.OpAMD64BSFW,
ssa.OpAMD64BSRQ, ssa.OpAMD64BSRL, ssa.OpAMD64BSRW,
ssa.OpAMD64SQRTSD:
p := gc.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = gc.SSARegNum(v.Args[0])
@ -1008,9 +1038,9 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
opregreg(x86.AANDL, gc.SSARegNum(v), x86.REG_AX)
case ssa.OpAMD64InvertFlags:
v.Fatalf("InvertFlags should never make it to codegen %v", v)
v.Fatalf("InvertFlags should never make it to codegen %v", v.LongString())
case ssa.OpAMD64FlagEQ, ssa.OpAMD64FlagLT_ULT, ssa.OpAMD64FlagLT_UGT, ssa.OpAMD64FlagGT_ULT, ssa.OpAMD64FlagGT_UGT:
v.Fatalf("Flag* ops should never make it to codegen %v", v)
v.Fatalf("Flag* ops should never make it to codegen %v", v.LongString())
case ssa.OpAMD64REPSTOSQ:
gc.Prog(x86.AREP)
gc.Prog(x86.ASTOSQ)