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| author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-12-08 21:30:19 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-07 21:05:44 -0700 |
| commit | 45d84a60ee3f3f30ed1a41e39237d6fe53efdda7 (patch) | |
| tree | c5e711a960b3236a9e878e17ce9f8b8b8ebbce41 /example.c | |
| parent | 5f3baf5f3df4c7710631732cf34aad2869f5fd19 (diff) | |
| download | sparse-dev-45d84a60ee3f3f30ed1a41e39237d6fe53efdda7.tar.gz | |
Add a few more hard registers, and let things live a bit longer.
Our binops are destructive, but maybe we should try to copy
the destroyed register if it's still live.
Diffstat (limited to 'example.c')
| -rw-r--r-- | example.c | 36 |
1 files changed, 30 insertions, 6 deletions
@@ -29,6 +29,9 @@ static struct hardreg hardregs[] = { { .name = "eax" }, { .name = "edx" }, { .name = "ecx" }, + { .name = "ebx" }, + { .name = "esi" }, + { .name = "edi" }, }; #define REGNO (sizeof(hardregs)/sizeof(struct hardreg)) @@ -336,15 +339,36 @@ static const char* opcodes[] = { [OP_CONTEXT] = "context", }; + +static struct hardreg *copy_reg(struct bb_state *state, struct hardreg *src) +{ + int i; + + if (!src->busy) + return src; + + for (i = 0; i < REGNO; i++) { + struct hardreg *reg = hardregs + i; + if (!reg->busy) { + printf("\tmovl %s,%s\n", src->name, reg->name); + return reg; + } + } + + flush_reg(state, src); + return src; +} + static void generate_binop(struct bb_state *state, struct instruction *insn) { const char *op = opcodes[insn->opcode]; - struct hardreg *reg = getreg(state, insn->src1); - flush_reg(state, reg); - printf("\t%s.%d %s,%s\n", op, insn->size, reg_or_imm(state, insn->src2), reg->name); - reg->contains = insn->target; - reg->busy = 1; - reg->dirty = 1; + struct hardreg *src = getreg(state, insn->src1); + struct hardreg *dst = copy_reg(state, src); + + printf("\t%s.%d %s,%s\n", op, insn->size, reg_or_imm(state, insn->src2), dst->name); + dst->contains = insn->target; + dst->busy = 1; + dst->dirty = 1; } static void mark_pseudo_dead(pseudo_t pseudo) |