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pass: remove redundant jumps and dangling labels (#81)

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In jump-table-like constructs, the natural way of writing the code can sometimes produce redundant jumps or labels. Therefore some basic cleanup steps have been proposed. This diff adds two transforms:

1. Remove unconditional jumps to a label immediately following.
2. Remove labels with no references at all.

Fixes #75
This commit is contained in:
Michael McLoughlin
2019-04-15 19:42:11 -07:00
committed by GitHub
parent 57c23b967e
commit 2e7d06bc7a
12 changed files with 223 additions and 3 deletions
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16
tests/labels/labels.s Normal file
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@@ -0,0 +1,16 @@
// Code generated by command: go run asm.go -out labels.s -stubs stub.go. DO NOT EDIT.
#include "textflag.h"
// func Labels() uint64
TEXT ·Labels(SB), NOSPLIT, $0-8
XORQ AX, AX
INCQ AX
INCQ AX
INCQ AX
INCQ AX
INCQ AX
INCQ AX
INCQ AX
MOVQ AX, ret+0(FP)
RET