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cmd/compile: mark LoweredGetCallerPC rematerializeable

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The caller's PC is always available in the frame. We can just
load it when needed, no need to spill.

Change-Id: I9c0a525903e574bb4eec9fe53cbeb8c64321166a
Reviewed-on: https://go-review.googlesource.com/70710
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2017-10-13 11:05:12 -04:00
parent d1bbdbe760
commit e01eac371a
3 changed files with 8 additions and 6 deletions
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2
src/cmd/compile/internal/ssa/gen/386Ops.go
View File

@ -444,7 +444,7 @@ func init() {
// I.e., if f calls g "calls" getcallerpc,
// the result should be the PC within f that g will return to.
// See runtime/stubs.go for a more detailed discussion.
{name: "LoweredGetCallerPC", reg: gp01},
{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},
// LoweredGetCallerSP returns the SP of the caller of the current function.
{name: "LoweredGetCallerSP", reg: gp01, rematerializeable: true},
//arg0=ptr,arg1=mem, returns void. Faults if ptr is nil.

2
src/cmd/compile/internal/ssa/gen/AMD64Ops.go
View File

@ -555,7 +555,7 @@ func init() {
// I.e., if f calls g "calls" getcallerpc,
// the result should be the PC within f that g will return to.
// See runtime/stubs.go for a more detailed discussion.
{name: "LoweredGetCallerPC", reg: gp01},
{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},
// LoweredGetCallerSP returns the SP of the caller of the current function.
{name: "LoweredGetCallerSP", reg: gp01, rematerializeable: true},
//arg0=ptr,arg1=mem, returns void. Faults if ptr is nil.

10
src/cmd/compile/internal/ssa/opGen.go
View File

@ -4341,8 +4341,9 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "LoweredGetCallerPC",
argLen: 0,
name: "LoweredGetCallerPC",
argLen: 0,
rematerializeable: true,
reg: regInfo{
outputs: []outputInfo{
{0, 239}, // AX CX DX BX BP SI DI
@ -8118,8 +8119,9 @@ var opcodeTable = [...]opInfo{
},
},
{
name: "LoweredGetCallerPC",
argLen: 0,
name: "LoweredGetCallerPC",
argLen: 0,
rematerializeable: true,
reg: regInfo{
outputs: []outputInfo{
{0, 65519}, // AX CX DX BX BP SI DI R8 R9 R10 R11 R12 R13 R14 R15