Since the OP_SETCC instructions can only return a 0 or a 1, a
sign-extension won't change the value if the size is wider than 1.
The OP_SETCC can thus be changed to directly return the extended size.
Remove the unneeded extension.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
simplify.c | 4 ++++
validation/optim/setne0-sext.c | 1 -
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index 9927dd240..728647a3e 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1191,6 +1191,10 @@ static int simplify_cast(struct instruction *insn)
break;
case OP_FPCMP ... OP_BINCMP_END:
switch (insn->opcode) {
+ case OP_SEXT:
+ if (insn->size == 1)
+ break;
+ /* fall through */
case OP_ZEXT:
// simplify:
// setcc.n %t <- %a, %b
diff --git a/validation/optim/setne0-sext.c b/validation/optim/setne0-sext.c
index 565f8df24..4167979b8 100644
--- a/validation/optim/setne0-sext.c
+++ b/validation/optim/setne0-sext.c
@@ -3,7 +3,6 @@ long foo(int a) { return a != 0; }
/*
* check-name: setne0-sext
* check-command: test-linearize -m64 -Wno-decl $file
- * check-known-to-fail
*
* check-output-ignore
* check-output-excludes: sext\\.
--
2.18.0
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