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cmd/compile: add store to load forwarding rules on riscv64

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Adds the equivalent integer variants of the floating point rules
added in CL 599235.

Change-Id: Ibe03c26383059821d99cea2337799e6416b4c581
Reviewed-on: https://go-review.googlesource.com/c/go/+/700175
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Julian Zhu <jz531210@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Michael Munday 2025-08-30 21:53:37 +01:00 • committed by Gopher Robot
parent 80038586ed
commit 4373754bc9
2 changed files with 135 additions and 0 deletions
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2
src/cmd/compile/internal/ssa/_gen/RISCV64.rules
View file

@ -716,6 +716,8 @@
(MOVWUreg <t> x:(MOVWload [off] {sym} ptr mem)) && x.Uses == 1 && clobber(x) => @x.Block (MOVWUload <t> [off] {sym} ptr mem)
// Replace load from same location as preceding store with copy.
(MOV(D|W|H|B)load [off] {sym} ptr1 (MOV(D|W|H|B)store [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) => (MOV(D|W|H|B)reg x)
(MOV(W|H|B)Uload [off] {sym} ptr1 (MOV(W|H|B)store [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) => (MOV(W|H|B)Ureg x)
(MOVDload [off] {sym} ptr1 (FMOVDstore [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) => (FMVXD x)
(FMOVDload [off] {sym} ptr1 (MOVDstore [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) => (FMVDX x)
(MOVWload [off] {sym} ptr1 (FMOVWstore [off] {sym} ptr2 x _)) && isSamePtr(ptr1, ptr2) => (FMVXS x)

133
src/cmd/compile/internal/ssa/rewriteRISCV64.go
View file

@ -4740,6 +4740,25 @@ func rewriteValueRISCV64_OpRISCV64MOVBUload(v *Value) bool {
v.AddArg2(base, mem)
return true
}
// match: (MOVBUload [off] {sym} ptr1 (MOVBstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVBUreg x)
for {
off := auxIntToInt32(v.AuxInt)
sym := auxToSym(v.Aux)
ptr1 := v_0
if v_1.Op != OpRISCV64MOVBstore || auxIntToInt32(v_1.AuxInt) != off || auxToSym(v_1.Aux) != sym {
break
}
x := v_1.Args[1]
ptr2 := v_1.Args[0]
if !(isSamePtr(ptr1, ptr2)) {
break
}
v.reset(OpRISCV64MOVBUreg)
v.AddArg(x)
return true
}
return false
}
func rewriteValueRISCV64_OpRISCV64MOVBUreg(v *Value) bool {
@ -5049,6 +5068,25 @@ func rewriteValueRISCV64_OpRISCV64MOVBload(v *Value) bool {
v.AddArg2(base, mem)
return true
}
// match: (MOVBload [off] {sym} ptr1 (MOVBstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVBreg x)
for {
off := auxIntToInt32(v.AuxInt)
sym := auxToSym(v.Aux)
ptr1 := v_0
if v_1.Op != OpRISCV64MOVBstore || auxIntToInt32(v_1.AuxInt) != off || auxToSym(v_1.Aux) != sym {
break
}
x := v_1.Args[1]
ptr2 := v_1.Args[0]
if !(isSamePtr(ptr1, ptr2)) {
break
}
v.reset(OpRISCV64MOVBreg)
v.AddArg(x)
return true
}
return false
}
func rewriteValueRISCV64_OpRISCV64MOVBreg(v *Value) bool {
@ -5397,6 +5435,25 @@ func rewriteValueRISCV64_OpRISCV64MOVDload(v *Value) bool {
v.AddArg2(base, mem)
return true
}
// match: (MOVDload [off] {sym} ptr1 (MOVDstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVDreg x)
for {
off := auxIntToInt32(v.AuxInt)
sym := auxToSym(v.Aux)
ptr1 := v_0
if v_1.Op != OpRISCV64MOVDstore || auxIntToInt32(v_1.AuxInt) != off || auxToSym(v_1.Aux) != sym {
break
}
x := v_1.Args[1]
ptr2 := v_1.Args[0]
if !(isSamePtr(ptr1, ptr2)) {
break
}
v.reset(OpRISCV64MOVDreg)
v.AddArg(x)
return true
}
// match: (MOVDload [off] {sym} ptr1 (FMOVDstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (FMVXD x)
@ -5616,6 +5673,25 @@ func rewriteValueRISCV64_OpRISCV64MOVHUload(v *Value) bool {
v.AddArg2(base, mem)
return true
}
// match: (MOVHUload [off] {sym} ptr1 (MOVHstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVHUreg x)
for {
off := auxIntToInt32(v.AuxInt)
sym := auxToSym(v.Aux)
ptr1 := v_0
if v_1.Op != OpRISCV64MOVHstore || auxIntToInt32(v_1.AuxInt) != off || auxToSym(v_1.Aux) != sym {
break
}
x := v_1.Args[1]
ptr2 := v_1.Args[0]
if !(isSamePtr(ptr1, ptr2)) {
break
}
v.reset(OpRISCV64MOVHUreg)
v.AddArg(x)
return true
}
return false
}
func rewriteValueRISCV64_OpRISCV64MOVHUreg(v *Value) bool {
@ -5782,6 +5858,25 @@ func rewriteValueRISCV64_OpRISCV64MOVHload(v *Value) bool {
v.AddArg2(base, mem)
return true
}
// match: (MOVHload [off] {sym} ptr1 (MOVHstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVHreg x)
for {
off := auxIntToInt32(v.AuxInt)
sym := auxToSym(v.Aux)
ptr1 := v_0
if v_1.Op != OpRISCV64MOVHstore || auxIntToInt32(v_1.AuxInt) != off || auxToSym(v_1.Aux) != sym {
break
}
x := v_1.Args[1]
ptr2 := v_1.Args[0]
if !(isSamePtr(ptr1, ptr2)) {
break
}
v.reset(OpRISCV64MOVHreg)
v.AddArg(x)
return true
}
return false
}
func rewriteValueRISCV64_OpRISCV64MOVHreg(v *Value) bool {
@ -6141,6 +6236,25 @@ func rewriteValueRISCV64_OpRISCV64MOVWUload(v *Value) bool {
v.AddArg2(base, mem)
return true
}
// match: (MOVWUload [off] {sym} ptr1 (MOVWstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVWUreg x)
for {
off := auxIntToInt32(v.AuxInt)
sym := auxToSym(v.Aux)
ptr1 := v_0
if v_1.Op != OpRISCV64MOVWstore || auxIntToInt32(v_1.AuxInt) != off || auxToSym(v_1.Aux) != sym {
break
}
x := v_1.Args[1]
ptr2 := v_1.Args[0]
if !(isSamePtr(ptr1, ptr2)) {
break
}
v.reset(OpRISCV64MOVWUreg)
v.AddArg(x)
return true
}
// match: (MOVWUload [off] {sym} ptr1 (FMOVWstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVWUreg (FMVXS x))
@ -6352,6 +6466,25 @@ func rewriteValueRISCV64_OpRISCV64MOVWload(v *Value) bool {
v.AddArg2(base, mem)
return true
}
// match: (MOVWload [off] {sym} ptr1 (MOVWstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (MOVWreg x)
for {
off := auxIntToInt32(v.AuxInt)
sym := auxToSym(v.Aux)
ptr1 := v_0
if v_1.Op != OpRISCV64MOVWstore || auxIntToInt32(v_1.AuxInt) != off || auxToSym(v_1.Aux) != sym {
break
}
x := v_1.Args[1]
ptr2 := v_1.Args[0]
if !(isSamePtr(ptr1, ptr2)) {
break
}
v.reset(OpRISCV64MOVWreg)
v.AddArg(x)
return true
}
// match: (MOVWload [off] {sym} ptr1 (FMOVWstore [off] {sym} ptr2 x _))
// cond: isSamePtr(ptr1, ptr2)
// result: (FMVXS x)