[gcc r13-2013] tree-optimization/106513 - fix mistake in bswap symbolic number shifts

[Richard Biener]

https://gcc.gnu.org/g:f675afa4eeac9910a2c085a95aa04d6d9f2fd8d6

commit r13-2013-gf675afa4eeac9910a2c085a95aa04d6d9f2fd8d6
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Aug 10 15:45:22 2022 +0200

    tree-optimization/106513 - fix mistake in bswap symbolic number shifts
    
    This fixes a mistake in typing a local variable in the symbolic
    shift routine.
    
            PR tree-optimization/106513
            * gimple-ssa-store-merging.cc (do_shift_rotate): Use uint64_t
            for head_marker.
    
            * gcc.dg/torture/pr106513.c: New testcase.

Diff:
---
 gcc/gimple-ssa-store-merging.cc         |  2 +-
 gcc/testsuite/gcc.dg/torture/pr106513.c | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/gcc/gimple-ssa-store-merging.cc b/gcc/gimple-ssa-store-merging.cc
index 0640168bcc4..b80b8eac444 100644
--- a/gcc/gimple-ssa-store-merging.cc
+++ b/gcc/gimple-ssa-store-merging.cc
@@ -263,7 +263,7 @@ do_shift_rotate (enum tree_code code,
 		 int count)
 {
   int i, size = TYPE_PRECISION (n->type) / BITS_PER_UNIT;
-  unsigned head_marker;
+  uint64_t head_marker;
 
   if (count < 0
       || count >= TYPE_PRECISION (n->type)
diff --git a/gcc/testsuite/gcc.dg/torture/pr106513.c b/gcc/testsuite/gcc.dg/torture/pr106513.c
new file mode 100644
index 00000000000..aa4f4d513d7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr106513.c
@@ -0,0 +1,26 @@
+/* { dg-do run } */
+
+typedef __INT64_TYPE__ int64_t;
+
+__attribute__((noinline)) int64_t
+swap64 (int64_t n)
+{
+  return (((n & (((int64_t) 0xff) )) << 56) |
+          ((n & (((int64_t) 0xff) << 8)) << 40) |
+          ((n & (((int64_t) 0xff) << 16)) << 24) |
+          ((n & (((int64_t) 0xff) << 24)) << 8) |
+          ((n & (((int64_t) 0xff) << 32)) >> 8) |
+          ((n & (((int64_t) 0xff) << 40)) >> 24) |
+          ((n & (((int64_t) 0xff) << 48)) >> 40) |
+          ((n & ((int64_t)(0xffull << 56))) >> 56));
+}
+
+int main (void)
+{
+  volatile int64_t n = 0x8000000000000000ll;
+
+  if (swap64(n) != 0xffffffffffffff80ll)
+    __builtin_abort ();
+
+  return 0;
+}