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Commit fddc0045 authored by Cherry Zhang's avatar Cherry Zhang
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cmd/compile: remove nil check for Zero/Move on 386, AMD64, S390X 

Fixes #18003.

Change-Id: Iadcc5c424c64badecfb5fdbd4dbd9197df56182c
Reviewed-on: https://go-review.googlesource.com/33421
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarKeith Randall <khr@golang.org>
parent c1363b2d
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Inline Side-by-side
Showing with 73 additions and 38 deletions
src/cmd/compile/internal/ssa/gen/386Ops.go
View file @ fddc0045
......@@ -373,6 +373,7 @@ func init() {
clobbers: buildReg("DI CX"),
// Note: CX is only clobbered when dynamic linking.
},
faultOnNilArg0: true,
},
// arg0 = address of memory to zero
......@@ -387,6 +388,7 @@ func init() {
inputs: []regMask{buildReg("DI"), buildReg("CX"), buildReg("AX")},
clobbers: buildReg("DI CX"),
},
faultOnNilArg0: true,
},
{name: "CALLstatic", argLength: 1, reg: regInfo{clobbers: callerSave}, aux: "SymOff", clobberFlags: true, call: true}, // call static function aux.(*gc.Sym). arg0=mem, auxint=argsize, returns mem
......@@ -408,7 +410,9 @@ func init() {
inputs: []regMask{buildReg("DI"), buildReg("SI")},
clobbers: buildReg("DI SI CX"), // uses CX as a temporary
},
clobberFlags: true,
clobberFlags: true,
faultOnNilArg0: true,
faultOnNilArg1: true,
},
// arg0 = destination pointer
......@@ -423,6 +427,8 @@ func init() {
inputs: []regMask{buildReg("DI"), buildReg("SI"), buildReg("CX")},
clobbers: buildReg("DI SI CX"),
},
faultOnNilArg0: true,
faultOnNilArg1: true,
},
// (InvertFlags (CMPL a b)) == (CMPL b a)
......
src/cmd/compile/internal/ssa/gen/AMD64Ops.go
View file @ fddc0045
......@@ -421,7 +421,8 @@ func init() {
inputs: []regMask{buildReg("DI"), buildReg("X0")},
clobbers: buildReg("DI"),
},
clobberFlags: true,
clobberFlags: true,
faultOnNilArg0: true,
},
{name: "MOVOconst", reg: regInfo{nil, 0, []regMask{fp}}, typ: "Int128", aux: "Int128", rematerializeable: true},
......@@ -437,6 +438,7 @@ func init() {
inputs: []regMask{buildReg("DI"), buildReg("CX"), buildReg("AX")},
clobbers: buildReg("DI CX"),
},
faultOnNilArg0: true,
},
{name: "CALLstatic", argLength: 1, reg: regInfo{clobbers: callerSave}, aux: "SymOff", clobberFlags: true, call: true}, // call static function aux.(*gc.Sym). arg0=mem, auxint=argsize, returns mem
......@@ -458,7 +460,9 @@ func init() {
inputs: []regMask{buildReg("DI"), buildReg("SI")},
clobbers: buildReg("DI SI X0"), // uses X0 as a temporary
},
clobberFlags: true,
clobberFlags: true,
faultOnNilArg0: true,
faultOnNilArg1: true,
},
// arg0 = destination pointer
......@@ -473,6 +477,8 @@ func init() {
inputs: []regMask{buildReg("DI"), buildReg("SI"), buildReg("CX")},
clobbers: buildReg("DI SI CX"),
},
faultOnNilArg0: true,
faultOnNilArg1: true,
},
// (InvertFlags (CMPQ a b)) == (CMPQ b a)
......
src/cmd/compile/internal/ssa/gen/S390XOps.go
View file @ fddc0045
......@@ -568,8 +568,10 @@ func init() {
inputs: []regMask{buildReg("R1"), buildReg("R2"), gpsp},
clobbers: buildReg("R1 R2"),
},
clobberFlags: true,
typ: "Mem",
clobberFlags: true,
typ: "Mem",
faultOnNilArg0: true,
faultOnNilArg1: true,
},
// large clear
......@@ -592,8 +594,9 @@ func init() {
inputs: []regMask{buildReg("R1"), gpsp},
clobbers: buildReg("R1"),
},
clobberFlags: true,
typ: "Mem",
clobberFlags: true,
typ: "Mem",
faultOnNilArg0: true,
},
}
......
src/cmd/compile/internal/ssa/opGen.go
View file @ fddc0045
......@@ -4071,9 +4071,10 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "DUFFZERO",
auxType: auxInt64,
argLen: 3,
name: "DUFFZERO",
auxType: auxInt64,
argLen: 3,
faultOnNilArg0: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -4083,8 +4084,9 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "REPSTOSL",
argLen: 4,
name: "REPSTOSL",
argLen: 4,
faultOnNilArg0: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -4152,10 +4154,12 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "DUFFCOPY",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
name: "DUFFCOPY",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
faultOnNilArg0: true,
faultOnNilArg1: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -4165,8 +4169,10 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "REPMOVSL",
argLen: 4,
name: "REPMOVSL",
argLen: 4,
faultOnNilArg0: true,
faultOnNilArg1: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -7062,10 +7068,11 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "DUFFZERO",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
name: "DUFFZERO",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
faultOnNilArg0: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -7086,8 +7093,9 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "REPSTOSQ",
argLen: 4,
name: "REPSTOSQ",
argLen: 4,
faultOnNilArg0: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -7155,10 +7163,12 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "DUFFCOPY",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
name: "DUFFCOPY",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
faultOnNilArg0: true,
faultOnNilArg1: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -7168,8 +7178,10 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "REPMOVSQ",
argLen: 4,
name: "REPMOVSQ",
argLen: 4,
faultOnNilArg0: true,
faultOnNilArg1: true,
reg: regInfo{
inputs: []inputInfo{
{0, 128}, // DI
......@@ -19714,10 +19726,12 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "LoweredMove",
auxType: auxInt64,
argLen: 4,
clobberFlags: true,
name: "LoweredMove",
auxType: auxInt64,
argLen: 4,
clobberFlags: true,
faultOnNilArg0: true,
faultOnNilArg1: true,
reg: regInfo{
inputs: []inputInfo{
{0, 2}, // R1
......@@ -19728,10 +19742,11 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "LoweredZero",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
name: "LoweredZero",
auxType: auxInt64,
argLen: 3,
clobberFlags: true,
faultOnNilArg0: true,
reg: regInfo{
inputs: []inputInfo{
{0, 2}, // R1
......
test/nilptr3.go
View file @ fddc0045
......@@ -254,3 +254,8 @@ func f7() (*Struct, float64) {
p := &t.Y // ERROR "removed nil check"
return t, *p // ERROR "removed nil check"
}
// make sure to remove nil check for memory move (issue #18003)
func f8(t *[8]int) [8]int {
return *t // ERROR "removed nil check"
}
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