--- /dev/null
+/* { dg-do compile } */
+/* { dg-require-effective-target int128 } */
+/* { dg-options "-Os -fdump-tree-evrp-details" } */
+
+#include <stdint.h>
+#include <limits.h>
+
+typedef unsigned int word __attribute__((mode(word)));
+typedef unsigned __int128 bigger_than_word;
+
+int
+foo (bigger_than_word a, word b, uint8_t c)
+{
+ /* Must fold use of t1 into use of b, as b is no wider than word_mode. */
+ const uint8_t t1 = b % UCHAR_MAX;
+
+ /* Must NOT fold use of t2 into use of a, as a is wider than word_mode. */
+ const uint8_t t2 = a % UCHAR_MAX;
+
+ /* Must fold use of t3 into use of c, as c is narrower than t3. */
+ const uint32_t t3 = (const uint32_t)(c >> 1);
+
+ uint16_t ret = 0;
+
+ if (t1 == 1)
+ ret = 20;
+ else if (t2 == 2)
+ ret = 30;
+ else if (t3 == 3)
+ ret = 40;
+ /* Th extra condition below is necessary to prevent a prior pass from
+ folding away the cast. Ignored in scan-tree-dump. */
+ else if (t3 == 4)
+ ret = 50;
+
+ return ret;
+}
+
+/* { dg-final { scan-tree-dump "Folded into: if \\(_\[0-9\]+ == 1\\)" "evrp" } } */
+/* { dg-final { scan-tree-dump-not "Folded into: if \\(_\[0-9\]+ == 2\\)" "evrp" } } */
+/* { dg-final { scan-tree-dump "Folded into: if \\(_\[0-9\]+ == 3\\)" "evrp" } } */
#include "gimple-range.h"
#include "gimple-range-path.h"
#include "value-pointer-equiv.h"
+#include "gimple-fold.h"
/* Set of SSA names found live during the RPO traversal of the function
for still active basic-blocks. */
bool fold_stmt (gimple_stmt_iterator *gsi) OVERRIDE
{
- return m_simplifier.simplify (gsi);
+ if (m_simplifier.simplify (gsi))
+ return true;
+ return ::fold_stmt (gsi, follow_single_use_edges);
}
private: