diff options
| author |   Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-11-26 23:26:44 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-07 21:05:03 -0700 |
| commit | b22aa7228d7fab35b86cb57a4b33d3826ec7e916 (patch) | |
| tree | 4b2b80b7fa19b38946be9e5920b8989888e9c089 /simplify.c | |
| parent | Simplify constant subtraction into addition. (diff) | |
| download | sparse-b22aa7228d7fab35b86cb57a4b33d3826ec7e916.tar.gz sparse-b22aa7228d7fab35b86cb57a4b33d3826ec7e916.tar.bz2 sparse-b22aa7228d7fab35b86cb57a4b33d3826ec7e916.zip | |
Teach 'memop' simplification about offsetting.
Handle simple constant offsets and fold them into the
memop offset.
Diffstat (limited to 'simplify.c')
| -rw-r--r-- | simplify.c | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -409,6 +409,8 @@ static int simplify_unop(struct instruction *insn) static int simplify_memop(struct instruction *insn) { pseudo_t addr = insn->src; + pseudo_t new, off; + if (addr->type == PSEUDO_REG) { struct instruction *def = addr->def; if (def->opcode == OP_SETVAL && def->src) { @@ -416,8 +418,25 @@ static int simplify_memop(struct instruction *insn) use_pseudo(def->src, &insn->src); return REPEAT_CSE | REPEAT_SYMBOL_CLEANUP; } + if (def->opcode == OP_ADD) { + new = def->src1; + off = def->src2; + if (constant(off)) + goto offset; + new = off; + off = def->src1; + if (constant(off)) + goto offset; + return 0; + } } return 0; + +offset: + insn->offset += off->value; + use_pseudo(new, &insn->src); + remove_usage(addr, &insn->src); + return REPEAT_CSE | REPEAT_SYMBOL_CLEANUP; } int simplify_instruction(struct instruction *insn) |