Since the OP_SETCC instructions can only return a 0 or a 1,
a subsequent AND mask can often be heavily simplified.
Simplify the mask value.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
simplify.c | 5 +++++
validation/optim/setcc-mask.c | 1 -
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index 45e03de19..994c757a9 100644
--- a/simplify.c
+++ b/simplify.c
@@ -779,8 +779,13 @@ static int simplify_constant_mask(struct instruction *insn, unsigned long long m
int osize;
switch (DEF_OPCODE(def, old)) {
+ case OP_FPCMP ... OP_BINCMP_END:
+ osize = 1;
+ goto oldsize;
case OP_ZEXT:
osize = def->orig_type->bit_size;
+ /* fall through */
+ oldsize:
omask = (1ULL << osize) - 1;
nmask = mask & omask;
if (nmask == omask)
diff --git a/validation/optim/setcc-mask.c b/validation/optim/setcc-mask.c
index c8df10494..5d2717880 100644
--- a/validation/optim/setcc-mask.c
+++ b/validation/optim/setcc-mask.c
@@ -6,7 +6,6 @@ int foo (int a)
/*
* check-name: setcc-mask
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-start
foo:
--
2.18.0
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