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cmd/compile: use correct type in amd64 late-lower rules

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The wrong type causes the wrong width spill, which corrupts
the value.  I tried to write a test for this and did not
succeed, but was able (using gossahash and ssa.html) to
isolate to exact change and spill.

Fixes #59432.

Change-Id: I85ad82c9f8fed7674c69d6a2b0a62e111f690454
Reviewed-on: https://go-review.googlesource.com/c/go/+/482536
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
David Chase 2023-04-05 15:49:07 -04:00
parent 8d68b388d4
commit f9cf2c4d04
2 changed files with 41 additions and 35 deletions
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10
src/cmd/compile/internal/ssa/_gen/AMD64latelower.rules
View File

@ -4,11 +4,11 @@
// split 3 operand LEA.
// Note: Don't split pointer computations in order to avoid invalid pointers.
(LEA(Q|L|W)1 <t> [c] {s} x y) && isPtr(x.Type) && c != 0 && s == nil => (ADD(Q|L|L) x (ADD(Q|L|L)const <y.Type> [c] y))
(LEA(Q|L|W)1 <t> [c] {s} x y) && !isPtr(x.Type) && c != 0 && s == nil => (ADD(Q|L|L) y (ADD(Q|L|L)const <x.Type> [c] x))
(LEA(Q|L|W)2 <t> [c] {s} x y) && !isPtr(t) && c != 0 && s == nil => (ADD(Q|L|L)const [c] (LEA(Q|L|W)2 <x.Type> x y))
(LEA(Q|L|W)4 <t> [c] {s} x y) && !isPtr(t) && c != 0 && s == nil => (ADD(Q|L|L)const [c] (LEA(Q|L|W)4 <x.Type> x y))
(LEA(Q|L|W)8 <t> [c] {s} x y) && !isPtr(t) && c != 0 && s == nil => (ADD(Q|L|L)const [c] (LEA(Q|L|W)8 <x.Type> x y))
(LEA(Q|L|W)1 <t> [c] {s} x y) && isPtr(x.Type) && c != 0 && s == nil => (ADD(Q|L|L) x (ADD(Q|L|L)const <t> [c] y))
(LEA(Q|L|W)1 <t> [c] {s} x y) && !isPtr(x.Type) && c != 0 && s == nil => (ADD(Q|L|L) y (ADD(Q|L|L)const <t> [c] x))
(LEA(Q|L|W)2 <t> [c] {s} x y) && !isPtr(t) && c != 0 && s == nil => (ADD(Q|L|L)const [c] (LEA(Q|L|W)2 <t> x y))
(LEA(Q|L|W)4 <t> [c] {s} x y) && !isPtr(t) && c != 0 && s == nil => (ADD(Q|L|L)const [c] (LEA(Q|L|W)4 <t> x y))
(LEA(Q|L|W)8 <t> [c] {s} x y) && !isPtr(t) && c != 0 && s == nil => (ADD(Q|L|L)const [c] (LEA(Q|L|W)8 <t> x y))
// Prefer SARX/SHLX/SHRX instruction because it has less register restriction on the shift input.
(SAR(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SARX(Q|L) x y)

66
src/cmd/compile/internal/ssa/rewriteAMD64latelower.go
View File

@ -51,8 +51,9 @@ func rewriteValueAMD64latelower_OpAMD64LEAL1(v *Value) bool {
b := v.Block
// match: (LEAL1 <t> [c] {s} x y)
// cond: isPtr(x.Type) && c != 0 && s == nil
// result: (ADDL x (ADDLconst <y.Type> [c] y))
// result: (ADDL x (ADDLconst <t> [c] y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
s := auxToSym(v.Aux)
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
@ -62,7 +63,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL1(v *Value) bool {
continue
}
v.reset(OpAMD64ADDL)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, y.Type)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, t)
v0.AuxInt = int32ToAuxInt(c)
v0.AddArg(y)
v.AddArg2(x, v0)
@ -72,8 +73,9 @@ func rewriteValueAMD64latelower_OpAMD64LEAL1(v *Value) bool {
}
// match: (LEAL1 <t> [c] {s} x y)
// cond: !isPtr(x.Type) && c != 0 && s == nil
// result: (ADDL y (ADDLconst <x.Type> [c] x))
// result: (ADDL y (ADDLconst <t> [c] x))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
s := auxToSym(v.Aux)
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
@ -83,7 +85,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL1(v *Value) bool {
continue
}
v.reset(OpAMD64ADDL)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, t)
v0.AuxInt = int32ToAuxInt(c)
v0.AddArg(x)
v.AddArg2(y, v0)
@ -99,7 +101,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL2(v *Value) bool {
b := v.Block
// match: (LEAL2 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDLconst [c] (LEAL2 <x.Type> x y))
// result: (ADDLconst [c] (LEAL2 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -111,7 +113,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL2(v *Value) bool {
}
v.reset(OpAMD64ADDLconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAL2, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAL2, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -124,7 +126,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL4(v *Value) bool {
b := v.Block
// match: (LEAL4 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDLconst [c] (LEAL4 <x.Type> x y))
// result: (ADDLconst [c] (LEAL4 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -136,7 +138,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL4(v *Value) bool {
}
v.reset(OpAMD64ADDLconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAL4, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAL4, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -149,7 +151,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL8(v *Value) bool {
b := v.Block
// match: (LEAL8 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDLconst [c] (LEAL8 <x.Type> x y))
// result: (ADDLconst [c] (LEAL8 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -161,7 +163,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAL8(v *Value) bool {
}
v.reset(OpAMD64ADDLconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAL8, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAL8, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -174,8 +176,9 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ1(v *Value) bool {
b := v.Block
// match: (LEAQ1 <t> [c] {s} x y)
// cond: isPtr(x.Type) && c != 0 && s == nil
// result: (ADDQ x (ADDQconst <y.Type> [c] y))
// result: (ADDQ x (ADDQconst <t> [c] y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
s := auxToSym(v.Aux)
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
@ -185,7 +188,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ1(v *Value) bool {
continue
}
v.reset(OpAMD64ADDQ)
v0 := b.NewValue0(v.Pos, OpAMD64ADDQconst, y.Type)
v0 := b.NewValue0(v.Pos, OpAMD64ADDQconst, t)
v0.AuxInt = int32ToAuxInt(c)
v0.AddArg(y)
v.AddArg2(x, v0)
@ -195,8 +198,9 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ1(v *Value) bool {
}
// match: (LEAQ1 <t> [c] {s} x y)
// cond: !isPtr(x.Type) && c != 0 && s == nil
// result: (ADDQ y (ADDQconst <x.Type> [c] x))
// result: (ADDQ y (ADDQconst <t> [c] x))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
s := auxToSym(v.Aux)
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
@ -206,7 +210,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ1(v *Value) bool {
continue
}
v.reset(OpAMD64ADDQ)
v0 := b.NewValue0(v.Pos, OpAMD64ADDQconst, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64ADDQconst, t)
v0.AuxInt = int32ToAuxInt(c)
v0.AddArg(x)
v.AddArg2(y, v0)
@ -222,7 +226,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ2(v *Value) bool {
b := v.Block
// match: (LEAQ2 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDQconst [c] (LEAQ2 <x.Type> x y))
// result: (ADDQconst [c] (LEAQ2 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -234,7 +238,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ2(v *Value) bool {
}
v.reset(OpAMD64ADDQconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAQ2, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAQ2, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -247,7 +251,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ4(v *Value) bool {
b := v.Block
// match: (LEAQ4 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDQconst [c] (LEAQ4 <x.Type> x y))
// result: (ADDQconst [c] (LEAQ4 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -259,7 +263,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ4(v *Value) bool {
}
v.reset(OpAMD64ADDQconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAQ4, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAQ4, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -272,7 +276,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ8(v *Value) bool {
b := v.Block
// match: (LEAQ8 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDQconst [c] (LEAQ8 <x.Type> x y))
// result: (ADDQconst [c] (LEAQ8 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -284,7 +288,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAQ8(v *Value) bool {
}
v.reset(OpAMD64ADDQconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAQ8, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAQ8, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -297,8 +301,9 @@ func rewriteValueAMD64latelower_OpAMD64LEAW1(v *Value) bool {
b := v.Block
// match: (LEAW1 <t> [c] {s} x y)
// cond: isPtr(x.Type) && c != 0 && s == nil
// result: (ADDL x (ADDLconst <y.Type> [c] y))
// result: (ADDL x (ADDLconst <t> [c] y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
s := auxToSym(v.Aux)
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
@ -308,7 +313,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW1(v *Value) bool {
continue
}
v.reset(OpAMD64ADDL)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, y.Type)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, t)
v0.AuxInt = int32ToAuxInt(c)
v0.AddArg(y)
v.AddArg2(x, v0)
@ -318,8 +323,9 @@ func rewriteValueAMD64latelower_OpAMD64LEAW1(v *Value) bool {
}
// match: (LEAW1 <t> [c] {s} x y)
// cond: !isPtr(x.Type) && c != 0 && s == nil
// result: (ADDL y (ADDLconst <x.Type> [c] x))
// result: (ADDL y (ADDLconst <t> [c] x))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
s := auxToSym(v.Aux)
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
@ -329,7 +335,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW1(v *Value) bool {
continue
}
v.reset(OpAMD64ADDL)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64ADDLconst, t)
v0.AuxInt = int32ToAuxInt(c)
v0.AddArg(x)
v.AddArg2(y, v0)
@ -345,7 +351,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW2(v *Value) bool {
b := v.Block
// match: (LEAW2 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDLconst [c] (LEAW2 <x.Type> x y))
// result: (ADDLconst [c] (LEAW2 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -357,7 +363,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW2(v *Value) bool {
}
v.reset(OpAMD64ADDLconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAW2, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAW2, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -370,7 +376,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW4(v *Value) bool {
b := v.Block
// match: (LEAW4 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDLconst [c] (LEAW4 <x.Type> x y))
// result: (ADDLconst [c] (LEAW4 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -382,7 +388,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW4(v *Value) bool {
}
v.reset(OpAMD64ADDLconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAW4, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAW4, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true
@ -395,7 +401,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW8(v *Value) bool {
b := v.Block
// match: (LEAW8 <t> [c] {s} x y)
// cond: !isPtr(t) && c != 0 && s == nil
// result: (ADDLconst [c] (LEAW8 <x.Type> x y))
// result: (ADDLconst [c] (LEAW8 <t> x y))
for {
t := v.Type
c := auxIntToInt32(v.AuxInt)
@ -407,7 +413,7 @@ func rewriteValueAMD64latelower_OpAMD64LEAW8(v *Value) bool {
}
v.reset(OpAMD64ADDLconst)
v.AuxInt = int32ToAuxInt(c)
v0 := b.NewValue0(v.Pos, OpAMD64LEAW8, x.Type)
v0 := b.NewValue0(v.Pos, OpAMD64LEAW8, t)
v0.AddArg2(x, y)
v.AddArg(v0)
return true