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cmd/internal/obj: make morestack cutoff the same on all architectures

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There is always 128 bytes available below the stackguard. Allow functions
with medium-sized stack frames to use this, potentially allowing them to
avoid growing the stack.

This change makes all architectures use the same calculation as x86.

Change-Id: I2afb1a7c686ae5a933e50903b31ea4106e4cd0a0
Reviewed-on: https://go-review.googlesource.com/38734
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Michael Munday 2017-03-28 15:10:20 -04:00
parent fbe6723903
commit 41fd8d6401
5 changed files with 10 additions and 10 deletions
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4
src/cmd/internal/obj/mips/obj0.go
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@ -658,13 +658,13 @@ func stacksplit(ctxt *obj.Link, p *obj.Prog, framesize int32) *obj.Prog {
p.To.Reg = REG_R1
} else if framesize <= obj.StackBig {
// large stack: SP-framesize < stackguard-StackSmall
// ADD $-framesize, SP, R2
// ADD $-(framesize-StackSmall), SP, R2
// SGTU R2, stackguard, R1
p = obj.Appendp(ctxt, p)
p.As = add
p.From.Type = obj.TYPE_CONST
p.From.Offset = int64(-framesize)
p.From.Offset = -(int64(framesize) - obj.StackSmall)
p.Reg = REGSP
p.To.Type = obj.TYPE_REG
p.To.Reg = REG_R2