Combine will put CLOBBER (with a non-void mode) anywhere in a pattern
to poison it. reg_overlap_mentioned_p did not handle this. This patch
fixes that.
Tested on the PR testcase on x86_64-linux; also bootstrapped and
regression checked on powerpc64-linux {-m32,-m64}. Is this okay for
trunk and backports?
What should I do with the testcase? I don't think tool-generated
testcases are useful at all (instead, we should ship the tool!); but
if people want it anyway, should this be gcc.target/x86_64, or more
general somehow?
Segher
2018-09-18 Segher Boessenkool <seg...@kernel.crashing.org>
PR rtl-optimization/86882
* rtlanal.c (reg_overlap_mentioned_p): Handle CLOBBER.
---
gcc/rtlanal.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 6c620a4..e8b6b9c 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -1815,6 +1815,7 @@ reg_overlap_mentioned_p (const_rtx x, const_rtx in)
recurse:
switch (GET_CODE (x))
{
+ case CLOBBER:
case STRICT_LOW_PART:
case ZERO_EXTRACT:
case SIGN_EXTRACT:
--
1.8.3.1
