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| author |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-02-04 12:21:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-07 21:06:19 -0700 |
| commit | 7c1b75d0de6b3ad68fa40221a9b918d7fdd9e6fb (patch) | |
| tree | 1f1cd8d5fdc025d8aea5defcec02ab3d25fa47f8 /simplify.c | |
| parent | Split OP_CAST into signed, unsigned and FP casts. (diff) | |
| download | sparse-7c1b75d0de6b3ad68fa40221a9b918d7fdd9e6fb.tar.gz sparse-7c1b75d0de6b3ad68fa40221a9b918d7fdd9e6fb.tar.bz2 sparse-7c1b75d0de6b3ad68fa40221a9b918d7fdd9e6fb.zip | |
Make simplification remove casts that change neither size nor sign.
Diffstat (limited to 'simplify.c')
| -rw-r--r-- | simplify.c | 13 |
1 files changed, 12 insertions, 1 deletions
@@ -553,12 +553,17 @@ static int simplify_memop(struct instruction *insn) static int simplify_cast(struct instruction *insn) { + struct symbol *orig_type; int orig_size, size; pseudo_t src; if (dead_insn(insn, &insn->src, NULL, NULL)) return REPEAT_CSE; - orig_size = insn->orig_type ? insn->orig_type->bit_size : 0; + + orig_type = insn->orig_type; + if (!orig_type) + return 0; + orig_size = orig_type->bit_size; size = insn->size; src = insn->src; @@ -575,6 +580,12 @@ static int simplify_cast(struct instruction *insn) } } + if (size == orig_size) { + int op = (orig_type->ctype.modifiers & MOD_SIGNED) ? OP_SCAST : OP_CAST; + if (insn->opcode == op) + goto simplify; + } + return 0; simplify: |