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tree-optimization/113896 - testcase for fixed PR

Message ID 20240213124045.E784738582A7@sourceware.org
State New
Headers show
Series tree-optimization/113896 - testcase for fixed PR | expand

Commit Message

Richard Biener Feb. 13, 2024, 12:40 p.m. UTC 
The SLP permute optimization rewrite fixed this.

Tested on x86_64-unknown-linux-gnu, pushed to trunk and 13 branch.

	PR tree-optimization/113896
	* g++.dg/torture/pr113896.C: New testcase.
---
 gcc/testsuite/g++.dg/torture/pr113896.C | 35 +++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/torture/pr113896.C
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Patch

diff --git a/gcc/testsuite/g++.dg/torture/pr113896.C b/gcc/testsuite/g++.dg/torture/pr113896.C
new file mode 100644
index 00000000000..534c1c2e1cc
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/pr113896.C
@@ -0,0 +1,35 @@ 
+// { dg-do run }
+// { dg-additional-options "-ffast-math" }
+
+double a1 = 1.0;
+double a2 = 1.0;
+
+void __attribute__((noipa))
+f(double K[2], bool b)
+{
+    double A[] = {
+        b ? a1 : a2,
+        0,
+        0,
+        0
+    };
+
+    double sum{};
+    for(double  a : A) sum += a;
+    for(double& a : A) a /= sum;
+
+    if (b) {
+        K[0] = A[0]; // 1.0
+        K[1] = A[1]; // 0.0
+    } else {
+        K[0] = A[0] + A[1];
+    }
+}
+
+int main()
+{
+  double K[2]{};
+  f(K, true);
+  if (K[0] != 1. || K[1] != 0.)
+    __builtin_abort ();
+}