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[v4,9/9] fix: cast of OP_AND only valid if it's an OP_CAST

Message ID 20170809193806.30975-10-luc.vanoostenryck@gmail.com (mailing list archive)
State Superseded, archived
Headers show

Commit Message

Luc Van Oostenryck Aug. 9, 2017, 7:38 p.m. UTC 
A cast of an OP_AND can be simplified away if the mask
already 'cover' the value.
However this cannot be done if the cast is in fact
a sign-extension.

Fix this by adding the appropriate check of OP_CAST vs. OP_SCAST

Fixes: caeaf72d34d1e91aaea7340241232d1d877907b7
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 simplify.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/simplify.c b/simplify.c
index 370d4cb81..dc4fd457b 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1036,7 +1036,7 @@  static int simplify_cast(struct instruction *insn)
 	}
 
 	/* A cast of a "and" might be a no-op.. */
-	if (def_opcode(src) == OP_AND) {
+	if (insn->opcode == OP_CAST && def_opcode(src) == OP_AND) {
 		struct instruction *def = src->def;
 		if (def->size >= size) {
 			pseudo_t val = def->src2;