diff options
Diffstat (limited to 'simplify.c')
| -rw-r--r-- | simplify.c | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -454,6 +454,13 @@ static inline pseudo_t is_same_op(pseudo_t src, int op, unsigned osize) return def->src; } +static bool is_negate_of(pseudo_t p, pseudo_t ref) +{ + struct instruction *def; + + return (DEF_OPCODE(def, p) == OP_NEG) && (def->src == ref); +} + /// // replace the operand of an instruction // @insn: the instruction @@ -2308,6 +2315,13 @@ static int simplify_select(struct instruction *insn) // SEL(x {<,<=} y, a, b) --> SEL(x {>=,>} y, b, a) def->opcode = opcode_negate(def->opcode); return switch_pseudo(insn, &insn->src2, insn, &insn->src3); + case OP_SET_GT: + if (one_use(cond) && is_zero(def->src2)) { + if (is_negate_of(src2, src1)) + // SEL(x > 0, a, -a) --> SEL(x >= 0, a, -a) + return replace_opcode(def, OP_SET_GE); + } + break; case OP_SEL: if (constant(def->src2) && constant(def->src3)) { // Is the def of the conditional another select? |