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cmd/compile: fix typing of IData opcodes

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The rules for extracting the interface data word don't leave
the result typed correctly. If I do i.([1]*int)[0], the result
should have type *int, not [1]*int. Using (IData x) for the result
keeps the typing of the original top-level Value.

I don't think this would ever cause a real codegen bug, bug fixing it
at least makes the typing shown in ssa.html more consistent.

Change-Id: I239d821c394e58347639387981b0510d13b2f7b7
Reviewed-on: https://go-review.googlesource.com/c/go/+/204042
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Keith Randall 2019-10-29 13:14:58 -07:00 committed by Keith Randall
parent 1fb7d5472e
commit 70331a31ed
2 changed files with 15 additions and 15 deletions
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6
src/cmd/compile/internal/ssa/gen/generic.rules
View File

@ -803,7 +803,7 @@
// Putting struct{*byte} and similar into direct interfaces.
(IMake typ (StructMake1 val)) -> (IMake typ val)
(StructSelect [0] x:(IData _)) -> x
(StructSelect [0] (IData x)) -> (IData x)
// un-SSAable values use mem->mem copies
(Store {t} dst (Load src mem) mem) && !fe.CanSSA(t.(*types.Type)) ->
@ -823,9 +823,9 @@
(Store _ (ArrayMake0) mem) -> mem
(Store dst (ArrayMake1 e) mem) -> (Store {e.Type} dst e mem)
// Putting [1]{*byte} and similar into direct interfaces.
// Putting [1]*byte and similar into direct interfaces.
(IMake typ (ArrayMake1 val)) -> (IMake typ val)
(ArraySelect [0] x:(IData _)) -> x
(ArraySelect [0] (IData x)) -> (IData x)
// string ops
// Decomposing StringMake and lowering of StringPtr and StringLen

24
src/cmd/compile/internal/ssa/rewritegeneric.go
View File

@ -6142,18 +6142,18 @@ func rewriteValuegeneric_OpArraySelect_0(v *Value) bool {
v.AddArg(x)
return true
}
// match: (ArraySelect [0] x:(IData _))
// result: x
// match: (ArraySelect [0] (IData x))
// result: (IData x)
for {
if v.AuxInt != 0 {
break
}
x := v.Args[0]
if x.Op != OpIData {
v_0 := v.Args[0]
if v_0.Op != OpIData {
break
}
v.reset(OpCopy)
v.Type = x.Type
x := v_0.Args[0]
v.reset(OpIData)
v.AddArg(x)
return true
}
@ -43502,18 +43502,18 @@ func rewriteValuegeneric_OpStructSelect_10(v *Value) bool {
v0.AddArg(mem)
return true
}
// match: (StructSelect [0] x:(IData _))
// result: x
// match: (StructSelect [0] (IData x))
// result: (IData x)
for {
if v.AuxInt != 0 {
break
}
x := v.Args[0]
if x.Op != OpIData {
v_0 := v.Args[0]
if v_0.Op != OpIData {
break
}
v.reset(OpCopy)
v.Type = x.Type
x := v_0.Args[0]
v.reset(OpIData)
v.AddArg(x)
return true
}