An OP_ZEXT/OP_SEXT following by a OP_TRUNC to the original size is a NOP.
Simplify away such OP_TRUNC.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>
---
simplify.c | 10 ++++++++++
validation/optim/ext-trunc-same.c | 1 -
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/simplify.c b/simplify.c
index 1ac000e52..2549860e3 100644
--- a/simplify.c
+++ b/simplify.c
@@ -1008,6 +1008,16 @@ static int simplify_cast(struct instruction *insn)
return replace_pseudo(insn, &insn->src1, def->src);
}
break;
+ case OP_ZEXT:
+ case OP_SEXT:
+ switch (insn->opcode) {
+ case OP_TRUNC:
+ osize = def->orig_type->bit_size;
+ if (size == osize)
+ return replace_with_pseudo(insn, def->src);
+ break;
+ }
+ break;
}
return 0;
diff --git a/validation/optim/ext-trunc-same.c b/validation/optim/ext-trunc-same.c
index 634fdb87a..2bfcf0304 100644
--- a/validation/optim/ext-trunc-same.c
+++ b/validation/optim/ext-trunc-same.c
@@ -11,7 +11,6 @@ short ueq(unsigned short x)
/*
* check-name: ext-trunc-same
* check-command: test-linearize -Wno-decl $file
- * check-known-to-fail
*
* check-output-ignore
* check-output-excludes: trunc\\.
--
2.18.0
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