From cbafd33d81b31159929cc484a908868f2b6cc5bc Mon Sep 17 00:00:00 2001 From: Luc Van Oostenryck Date: Mon, 4 Jan 2021 00:20:06 +0100 Subject: simplify (x & M) {==,!=} C Signed-off-by: Luc Van Oostenryck --- simplify.c | 8 ++++++++ validation/optim/cmpe-and0.c | 1 - 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/simplify.c b/simplify.c index 6c11018e..b46e08c3 100644 --- a/simplify.c +++ b/simplify.c @@ -1263,6 +1263,14 @@ static int simplify_compare_constant(struct instruction *insn, long long value) break; bits = def->src2->value; switch (insn->opcode) { + case OP_SET_EQ: + if ((value & bits) != value) + return replace_with_value(insn, 0); + break; + case OP_SET_NE: + if ((value & bits) != value) + return replace_with_value(insn, 1); + break; case OP_SET_LE: value = sign_extend(value, def->size); if (bits & sign_bit(def->size)) diff --git a/validation/optim/cmpe-and0.c b/validation/optim/cmpe-and0.c index 7db60836..75af7752 100644 --- a/validation/optim/cmpe-and0.c +++ b/validation/optim/cmpe-and0.c @@ -4,7 +4,6 @@ int cmpe_and_ne(int a) { return ((a & 0xff00) != 0xff01) + 0; } /* * check-name: cmpe-and0 * check-command: test-linearize -Wno-decl $file - * check-known-to-fail * * check-output-ignore * check-output-returns: 1 -- cgit 1.2.3-korg