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cmd/compile: remove gc.Sysfunc calls from 387 backend

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gc.Sysfunc must not be called concurrently.
We set up runtime routines used by the backend
prior to doing any backend compilation.
I missed the 387 ones; fix that.

Sysfunc should have been unexported during 1.9.
I will rectify that in a subsequent CL.

Fixes #21352

Change-Id: I8386eaa1e05879c25c672b9c9fc693c938e9aeb6
Reviewed-on: https://go-review.googlesource.com/54090
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Avelino <t@avelino.xxx>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-08-08 16:38:25 -07:00
parent 6b53dd4f2b
commit 2fe53d8d55
3 changed files with 10 additions and 2 deletions
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4
src/cmd/compile/internal/gc/go.go
View File

@ -293,4 +293,8 @@ var (
typedmemmove,
typedmemclr,
Udiv *obj.LSym
// GO386=387
ControlWord64trunc,
ControlWord32 *obj.LSym
)

4
src/cmd/compile/internal/gc/ssa.go
View File

@ -92,6 +92,10 @@ func initssaconfig() {
typedmemmove = Sysfunc("typedmemmove")
typedmemclr = Sysfunc("typedmemclr")
Udiv = Sysfunc("udiv")
// GO386=387 runtime functions
ControlWord64trunc = Sysfunc("controlWord64trunc")
ControlWord32 = Sysfunc("controlWord32")
}
// buildssa builds an SSA function for fn.

4
src/cmd/compile/internal/x86/387.go
View File

@ -120,7 +120,7 @@ func ssaGenValue387(s *gc.SSAGenState, v *ssa.Value) {
p = s.Prog(x86.AFLDCW)
p.From.Type = obj.TYPE_MEM
p.From.Name = obj.NAME_EXTERN
p.From.Sym = gc.Sysfunc("controlWord32")
p.From.Sym = gc.ControlWord32
}
var op obj.As
@ -210,7 +210,7 @@ func ssaGenValue387(s *gc.SSAGenState, v *ssa.Value) {
p = s.Prog(x86.AFLDCW)
p.From.Type = obj.TYPE_MEM
p.From.Name = obj.NAME_EXTERN
p.From.Sym = gc.Sysfunc("controlWord64trunc")
p.From.Sym = gc.ControlWord64trunc
// Now do the conversion.
p = s.Prog(x86.AFMOVLP)