[gcc(refs/users/aoliva/heads/testme)] [PR42093] [arm] [thumb2] disable tree-dce for test

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:328d9cf03dd2ad6c469478d2099f5eb16dbe617a

commit 328d9cf03dd2ad6c469478d2099f5eb16dbe617a
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Fri Dec 2 03:28:05 2022 -0300

    [PR42093] [arm] [thumb2] disable tree-dce for test
    
    CD-DCE introduces blocks to share common PHI nodes, which replaces a
    backwards branch that used to prevent the thumb2 jump table shortening
    that PR42093 tested for.  In order to keep on testing that the
    backward branch prevents the jumptable shortening, disable tree-dce.
    
    
    for  gcc/testsuite/ChangeLog
    
            PR target/42093
            * gcc.target/arm/pr42093.c: Disable tree-dce.

Diff:
---
 gcc/testsuite/gcc.target/arm/pr42093.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.target/arm/pr42093.c b/gcc/testsuite/gcc.target/arm/pr42093.c
index 7ba2f933eef..69b1470607c 100644
--- a/gcc/testsuite/gcc.target/arm/pr42093.c
+++ b/gcc/testsuite/gcc.target/arm/pr42093.c
@@ -1,4 +1,4 @@
-/* { dg-options "-mthumb -O2 -fno-reorder-blocks" }  */
+/* { dg-options "-mthumb -O2 -fno-reorder-blocks -fno-tree-dce" }  */
 /* { dg-require-effective-target arm_thumb2_ok } */
 /* { dg-final { scan-assembler-not "tbb" } } */
 /* { dg-final { scan-assembler-not "tbh" } } */