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* [gcc r13-3211] [PR rtl-optimization/107182] Clear EDGE_CROSSING for jump->ret optimization
@ 2022-10-11 4:45 Jeff Law
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From: Jeff Law @ 2022-10-11 4:45 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:db24bdc743cf23ea12d2dcf8254d86ab366bb46d
commit r13-3211-gdb24bdc743cf23ea12d2dcf8254d86ab366bb46d
Author: Jeff Law <jeffreyalaw@gmail.com>
Date: Tue Oct 11 00:44:26 2022 -0400
[PR rtl-optimization/107182] Clear EDGE_CROSSING for jump->ret optimization
When turning a jump to a return into a return, we need to clear EDGE_CROSSING
of the fallthru edge to prevent a checking failure.
I considered not applying the transformation when the edge has EDGE_CROSSING
set, but it still seems like we ought to eliminate the unnecessary jump in
that case.
gcc/
PR rtl-optimization/107182
* cfgrtl.cc (fixup_reorder_chain): When optimizing a jump to a
return, clear EDGE_CROSSING on the appropriate edge.
Diff:
---
gcc/cfgrtl.cc | 1 +
1 file changed, 1 insertion(+)
diff --git a/gcc/cfgrtl.cc b/gcc/cfgrtl.cc
index 281a432f6a6..f31941a61f9 100644
--- a/gcc/cfgrtl.cc
+++ b/gcc/cfgrtl.cc
@@ -4055,6 +4055,7 @@ fixup_reorder_chain (void)
ret_label = PATTERN (ret);
dest = EXIT_BLOCK_PTR_FOR_FN (cfun);
+ e_fall->flags &= ~EDGE_CROSSING;
/* E_FALL->dest might become unreachable as a result of
replacing the jump with a return. So arrange to remove
unreachable blocks. */
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2022-10-11 4:45 [gcc r13-3211] [PR rtl-optimization/107182] Clear EDGE_CROSSING for jump->ret optimization Jeff Law
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