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* [gcc r11-5769] loop-iv: Add missing calls to `onlyjump_p'
@ 2020-12-05 18:28 Maciej W. Rozycki
0 siblings, 0 replies; only message in thread
From: Maciej W. Rozycki @ 2020-12-05 18:28 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:a2bd4e52cf710924107b08daaf3d09d7798c8022
commit r11-5769-ga2bd4e52cf710924107b08daaf3d09d7798c8022
Author: Maciej W. Rozycki <macro@linux-mips.org>
Date: Sat Dec 5 18:26:24 2020 +0000
loop-iv: Add missing calls to `onlyjump_p'
Ignore jumps that have side effects in loop processing as pasting the
body of a loop multiple times within is semantically equivalent to jump
deletion (between the iterations unrolled) even if we do not physically
delete the jump RTL insn.
gcc/
* loop-iv.c (simplify_using_initial_values): Only process jumps
that match `onlyjump_p'.
(check_simple_exit): Likewise.
Diff:
---
gcc/loop-iv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c
index 9f266e2a43c..9d401d29b95 100644
--- a/gcc/loop-iv.c
+++ b/gcc/loop-iv.c
@@ -1936,7 +1936,7 @@ simplify_using_initial_values (class loop *loop, enum rtx_code op, rtx *expr)
while (1)
{
insn = BB_END (e->src);
- if (any_condjump_p (insn))
+ if (any_condjump_p (insn) && onlyjump_p (insn))
{
rtx cond = get_condition (BB_END (e->src), NULL, false, true);
@@ -2887,7 +2887,7 @@ check_simple_exit (class loop *loop, edge e, class niter_desc *desc)
return;
/* It must end in a simple conditional jump. */
- if (!any_condjump_p (BB_END (exit_bb)))
+ if (!any_condjump_p (BB_END (exit_bb)) || !onlyjump_p (BB_END (exit_bb)))
return;
ein = EDGE_SUCC (exit_bb, 0);
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2020-12-05 18:28 [gcc r11-5769] loop-iv: Add missing calls to `onlyjump_p' Maciej W. Rozycki
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