i386: Fix *vec_extractv2sf_1 and *vec_extractv2sf_1 shufps alternative [PR93828]

shufps moves two of the four packed single-precision floating-point values
from *destination* operand (first operand) into the low quadword of the
destination operand.  Match source operand to the destination.

	PR target/93828
	* config/i386/mmx.md (*vec_extractv2sf_1): Match source operand
	to destination operand for shufps alternative.
	(*vec_extractv2si_1): Ditto.

testsuite/ChangeLog:

	PR target/93828
	* g++.target/i386/pr93828.C: New test.

diff --git a/gcc/testsuite/g++.target/i386/pr93828.C b/gcc/testsuite/g++.target/i386/pr93828.C
new file mode 100644 (file)
index 0000000..e0c1975
--- /dev/null
+++ b/gcc/testsuite/g++.target/i386/pr93828.C
@@ -0,0 +1,17 @@
+// { dg-do run }
+// { dg-require-effective-target c++11 }
+// { dg-options "-O2 -march=k8" }
+
+using float2[[gnu::vector_size (8)]] = float;
+using int2[[gnu::vector_size (8)]] = int;
+float2 y = { 2, 2 };
+
+int
+main ()
+{
+  const auto k = y == float2 { 2, 2 };
+  if (k[1] == 0)
+    __builtin_abort ();
+  const auto a = k & int2 { 2, 2 };
+  return a[0] - 2;
+}