https://gcc.gnu.org/g:e755f478c24c3e99409936af545ac83d35d27ad9
commit r15-319-ge755f478c24c3e99409936af545ac83d35d27ad9
Author: Stefan Schulze Frielinghaus <stefa...@linux.ibm.com>
Date: Wed May 8 10:48:45 2024 +0200
tree-ssa-loop-prefetch.cc: Honour -fno-unroll-loops
This fixes a couple of tests (gcc.dg/vect/pr109011-*.c) on s390 where
loops are unrolled although -fno-unroll-loops is specified.
gcc/ChangeLog:
* tree-ssa-loop-prefetch.cc (determine_unroll_factor): Honour
-fno-unroll-loops.
Diff:
---
gcc/tree-ssa-loop-prefetch.cc | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/gcc/tree-ssa-loop-prefetch.cc b/gcc/tree-ssa-loop-prefetch.cc
index 70073cc4fe46..bb5d5dec7795 100644
--- a/gcc/tree-ssa-loop-prefetch.cc
+++ b/gcc/tree-ssa-loop-prefetch.cc
@@ -1401,6 +1401,10 @@ determine_unroll_factor (class loop *loop, struct
mem_ref_group *refs,
struct mem_ref_group *agp;
struct mem_ref *ref;
+ /* Bail out early in case we must not unroll loops. */
+ if (!flag_unroll_loops)
+ return 1;
+
/* First check whether the loop is not too large to unroll. We ignore
PARAM_MAX_UNROLL_TIMES, because for small loops, it prevented us
from unrolling them enough to make exactly one cache line covered by each
