re PR tree-optimization/93098 (ICE with negative shifter)

	PR tree-optimization/93098
	* match.pd (popcount): For shift amounts, use integer_onep
	or wi::to_widest () == cst instead of tree_to_uhwi () == cst
	tests.  Make sure that precision is power of two larger than or equal
	to 16.  Ensure shift is never negative.  Use HOST_WIDE_INT_UC macro
	instead of ULL suffixed constants.  Formatting fixes.

	* gcc.c-torture/compile/pr93098.c: New test.

From-SVN: r279809

1 files changed, 37 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.c-torture/compile/pr93098.c b/gcc/testsuite/gcc.c-torture/compile/pr93098.c
new file mode 100644
index 00000000000..fb80719f28c
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr93098.c
@@ -0,0 +1,37 @@
+/* PR tree-optimization/93098 */
+
+int
+foo (unsigned long long x)
+{
+  x -= (x >> -1) & 0x5555555555555555ULL;
+  x = (x & 0x3333333333333333ULL) + ((x >> 2) & 0x3333333333333333ULL);
+  x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
+  return (x * 0x0101010101010101ULL) >> 56;
+}
+
+int
+bar (unsigned long long x)
+{
+  x -= (x >> 1) & 0x5555555555555555ULL;
+  x = (x & 0x3333333333333333ULL) + ((x >> -2) & 0x3333333333333333ULL);
+  x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
+  return (x * 0x0101010101010101ULL) >> 56;
+}
+
+int
+baz (unsigned long long x)
+{
+  x -= (x >> 1) & 0x5555555555555555ULL;
+  x = (x & 0x3333333333333333ULL) + ((x >> 2) & 0x3333333333333333ULL);
+  x = (x + (x >> -4)) & 0x0f0f0f0f0f0f0f0fULL;
+  return (x * 0x0101010101010101ULL) >> 56;
+}
+
+int
+qux (unsigned long long x)
+{
+  x -= (x >> 1) & 0x5555555555555555ULL;
+  x = (x & 0x3333333333333333ULL) + ((x >> 2) & 0x3333333333333333ULL);
+  x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
+  return (x * 0x0101010101010101ULL) >> -56;
+}