A sign-extension following another sign-extension can always
be simplified into a single sign-extension.
Simplify away such instructions.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
simplify.c | 5 +++++
validation/optim/sext-sext.c | 1 -
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index b05124027..51c930fad 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1090,6 +1090,11 @@ static int simplify_cast(struct instruction *insn)
insn->orig_type = def->orig_type;
return replace_pseudo(insn, &insn->src, def->src);
}
+ switch (insn->opcode) {
+ case OP_SEXT:
+ insn->orig_type = def->orig_type;
+ return replace_pseudo(insn, &insn->src, def->src);
+ }
break;
}
diff --git a/validation/optim/sext-sext.c b/validation/optim/sext-sext.c
index 3f7a0efc7..604a7dd4f 100644
--- a/validation/optim/sext-sext.c
+++ b/validation/optim/sext-sext.c
@@ -6,7 +6,6 @@ int foo(signed char offset)
/*
* check-name: sext-sext
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-ignore
* check-output-pattern(1): sext\\.
--
2.18.0
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