PR tree-optimization/19899

	* Makefile.in (tree-scalar-evolution.o): Add real.h.
	* tree-scalar-evolution.c: Include real.h.
	(add_to_evolution): Build constant -1 of correct type.

	* gcc.dg/tree-ssa/scev-1.c: New test.
	* gcc.dg/tree-ssa/scev-2.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102695 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 19 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/scev-1.c b/gcc/testsuite/gcc.dg/tree-ssa/scev-1.c
new file mode 100644
index 00000000000..b959fa17b2c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/scev-1.c
@@ -0,0 +1,19 @@
+/* PR tree-optimization/19899 */
+/* Decrementing a floating-point variable in a loop caused an ICE.  */
+
+/* { dg-do run } */
+/* { dg-options "-O -ftree-vectorize" } */
+
+extern void abort (void);
+
+int main()
+{
+  float i=1;
+
+  while (i>=0)
+    --i;
+
+  if (i != -1)
+    abort();
+  return 0;
+}