diff options
| -rw-r--r-- | simplify.c | 8 | ||||
| -rw-r--r-- | validation/optim/canonical-cmpu.c | 1 |
2 files changed, 7 insertions, 2 deletions
@@ -1081,18 +1081,24 @@ static int simplify_seteq_setne(struct instruction *insn, long long value) static int simplify_compare_constant(struct instruction *insn, long long value) { + int changed = 0; + switch (insn->opcode) { case OP_SET_B: if (!value) // (x < 0) --> 0 return replace_with_pseudo(insn, value_pseudo(0)); if (value == 1) // (x < 1) --> (x == 0) return replace_binop_value(insn, OP_SET_EQ, 0); + else // (x < y) --> (x <= (y-1)) + changed |= replace_binop_value(insn, OP_SET_BE, value - 1); break; case OP_SET_AE: if (!value) // (x >= 0) --> 1 return replace_with_pseudo(insn, value_pseudo(1)); if (value == 1) // (x >= 1) --> (x != 0) return replace_binop_value(insn, OP_SET_NE, 0); + else // (x >= y) --> (x > (y-1) + changed |= replace_binop_value(insn, OP_SET_A, value - 1); break; case OP_SET_BE: if (!value) // (x <= 0) --> (x == 0) @@ -1103,7 +1109,7 @@ static int simplify_compare_constant(struct instruction *insn, long long value) return replace_opcode(insn, OP_SET_NE); break; } - return 0; + return changed; } static int simplify_constant_mask(struct instruction *insn, unsigned long long mask) diff --git a/validation/optim/canonical-cmpu.c b/validation/optim/canonical-cmpu.c index 482408aa..29bbd0a8 100644 --- a/validation/optim/canonical-cmpu.c +++ b/validation/optim/canonical-cmpu.c @@ -9,7 +9,6 @@ int cmp_geu(unsigned int x) { return (x >= 256) == (x > 255); } /* * check-name: canonical-cmpu * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-returns: 1 |