diff options
| author | Keith Randall <khr@golang.org> | 2020-08-15 08:08:37 -0700 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2020-08-20 01:12:34 +0000 |
| commit | 46ca7b5ee2a8582736f1ddac27d8660e1104c345 (patch) | |
| tree | 77aa6865ac09a55a63362a7d6edd5780a87eff68 /src/cmd/internal/obj/mips | |
| parent | b0cc02e8c2bdba5401838d9d70a859191af9bfa5 (diff) | |
| download | go-46ca7b5ee2a8582736f1ddac27d8660e1104c345.tar.xz | |
cmd/internal/obj: stop removing NOPs from instruction stream
This has already been done for s390x, ppc64. This CL is for
all the other architectures.
Fixes #40796
Change-Id: Idd1816e057df63022d47e99fa06617811d8c8489
Reviewed-on: https://go-review.googlesource.com/c/go/+/248684
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Diffstat (limited to 'src/cmd/internal/obj/mips')
| -rw-r--r-- | src/cmd/internal/obj/mips/asm0.go | 3 | ||||
| -rw-r--r-- | src/cmd/internal/obj/mips/obj0.go | 26 |
2 files changed, 6 insertions, 23 deletions
diff --git a/src/cmd/internal/obj/mips/asm0.go b/src/cmd/internal/obj/mips/asm0.go index faa12bf133..faa827da9f 100644 --- a/src/cmd/internal/obj/mips/asm0.go +++ b/src/cmd/internal/obj/mips/asm0.go @@ -391,6 +391,9 @@ var optab = []Optab{ {obj.APCDATA, C_LCON, C_NONE, C_LCON, 0, 0, 0, 0, 0}, {obj.AFUNCDATA, C_SCON, C_NONE, C_ADDR, 0, 0, 0, 0, 0}, {obj.ANOP, C_NONE, C_NONE, C_NONE, 0, 0, 0, 0, 0}, + {obj.ANOP, C_LCON, C_NONE, C_NONE, 0, 0, 0, 0, 0}, // nop variants, see #40689 + {obj.ANOP, C_REG, C_NONE, C_NONE, 0, 0, 0, 0, 0}, + {obj.ANOP, C_FREG, C_NONE, C_NONE, 0, 0, 0, 0, 0}, {obj.ADUFFZERO, C_NONE, C_NONE, C_LBRA, 11, 4, 0, 0, 0}, // same as AJMP {obj.ADUFFCOPY, C_NONE, C_NONE, C_LBRA, 11, 4, 0, 0, 0}, // same as AJMP diff --git a/src/cmd/internal/obj/mips/obj0.go b/src/cmd/internal/obj/mips/obj0.go index 3106143844..77cad979a6 100644 --- a/src/cmd/internal/obj/mips/obj0.go +++ b/src/cmd/internal/obj/mips/obj0.go @@ -158,19 +158,14 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { /* * find leaf subroutines - * strip NOPs * expand RET * expand BECOME pseudo */ - var q *obj.Prog - var q1 *obj.Prog for p := c.cursym.Func.Text; p != nil; p = p.Link { switch p.As { /* too hard, just leave alone */ case obj.ATEXT: - q = p - p.Mark |= LABEL | LEAF | SYNC if p.Link != nil { p.Link.Mark |= LABEL @@ -179,7 +174,6 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { /* too hard, just leave alone */ case AMOVW, AMOVV: - q = p if p.To.Type == obj.TYPE_REG && p.To.Reg >= REG_SPECIAL { p.Mark |= LABEL | SYNC break @@ -195,11 +189,9 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { ATLBWI, ATLBP, ATLBR: - q = p p.Mark |= LABEL | SYNC case ANOR: - q = p if p.To.Type == obj.TYPE_REG { if p.To.Reg == REGZERO { p.Mark |= LABEL | SYNC @@ -235,8 +227,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { } else { p.Mark |= BRANCH } - q = p - q1 = p.Pcond + q1 := p.Pcond if q1 != nil { for q1.As == obj.ANOP { q1 = q1.Link @@ -254,24 +245,11 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { if q1 != nil { q1.Mark |= LABEL } - continue case ARET: - q = p if p.Link != nil { p.Link.Mark |= LABEL } - continue - - case obj.ANOP: - q1 = p.Link - q.Link = q1 /* q is non-nop */ - q1.Mark |= p.Mark - continue - - default: - q = p - continue } } @@ -284,6 +262,8 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) { mov = AMOVW } + var q *obj.Prog + var q1 *obj.Prog autosize := int32(0) var p1 *obj.Prog var p2 *obj.Prog |