testsuite: Avoid strict aliasing violations in some avx512 tests

These tests violated strict aliasing, fixed by using a union and
type punning through that.

2020-12-08  Jakub Jelinek  <jakub@redhat.com>

	* gcc.target/i386/avx512dq-vandnpd-2.c (CALC): Use union
	to avoid aliasing violations.
	* gcc.target/i386/avx512dq-vandnps-2.c (CALC): Likewise.
	* gcc.target/i386/avx512dq-vandpd-2.c (CALC): Likewise.
	* gcc.target/i386/avx512dq-vandps-2.c (CALC): Likewise.
	* gcc.target/i386/avx512dq-vorpd-2.c (CALC): Likewise.
	* gcc.target/i386/avx512dq-vorps-2.c (CALC): Likewise.
	* gcc.target/i386/avx512dq-vxorpd-2.c (CALC): Likewise.
	* gcc.target/i386/avx512dq-vxorps-2.c (CALC): Likewise.

8 files changed, 40 insertions, 16 deletions

diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vandnpd-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vandnpd-2.c
index 0be2b7c..0a7d19b 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vandnpd-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vandnpd-2.c
@@ -16,8 +16,11 @@ CALC (double *s1, double *s2, double *r)
 
   for (i = 0; i < SIZE; i++)
     {
-      tmp = (~(*(long long *) &s1[i])) & (*(long long *) &s2[i]);
-      r[i] = *(double *) &tmp;
+      union U { double d; long long l; } u1, u2;
+      u1.d = s1[i];
+      u2.d = s2[i];
+      u1.l = (~u1.l) & u2.l;
+      r[i] = u1.d;
     }
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vandnps-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vandnps-2.c
index 39a45c1..836a7ab 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vandnps-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vandnps-2.c
@@ -16,8 +16,11 @@ CALC (float *s1, float *s2, float *r)
 
   for (i = 0; i < SIZE; i++)
     {
-      tmp = (~(*(int *) &s1[i])) & (*(int *) &s2[i]);
-      r[i] = *(float *) &tmp;
+      union U { float f; int i; } u1, u2;
+      u1.f = s1[i];
+      u2.f = s2[i];
+      u1.i = (~u1.i) & u2.i;
+      r[i] = u1.f;
     }
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vandpd-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vandpd-2.c
index 208336b6..b629c9f 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vandpd-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vandpd-2.c
@@ -16,8 +16,11 @@ CALC (double *s1, double *s2, double *r)
 
   for (i = 0; i < SIZE; i++)
     {
-      tmp = (*(long long *) &s1[i]) & (*(long long *) &s2[i]);
-      r[i] = *(double *) &tmp;
+      union U { double d; long long l; } u1, u2;
+      u1.d = s1[i];
+      u2.d = s2[i];
+      u1.l &= u2.l;
+      r[i] = u1.d;
     }
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vandps-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vandps-2.c
index 50268b9..6e55e66 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vandps-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vandps-2.c
@@ -16,8 +16,11 @@ CALC (float *s1, float *s2, float *r)
 
   for (i = 0; i < SIZE; i++)
     {
-      tmp = (*(int *) &s1[i]) & (*(int *) &s2[i]);
-      r[i] = *(float *) &tmp;
+      union U { float f; int i; } u1, u2;
+      u1.f = s1[i];
+      u2.f = s2[i];
+      u1.i &= u2.i;
+      r[i] = u1.f;
     }
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vorpd-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vorpd-2.c
index 97fe84e..6376c1c 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vorpd-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vorpd-2.c
@@ -15,8 +15,11 @@ CALC (double *src1, double *src2, double *dst)
 
   for (i = 0; i < SIZE; i++)
     {
-      long long tmp = (*(long long *) &src1[i]) | (*(long long *) &src2[i]);
-      dst[i] = *(double *) &tmp;
+      union U { double d; long long l; } u1, u2;
+      u1.d = src1[i];
+      u2.d = src2[i];
+      u1.l |= u2.l;
+      dst[i] = u1.d;
     }
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vorps-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vorps-2.c
index 95a7c5f..3d30247 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vorps-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vorps-2.c
@@ -15,8 +15,11 @@ CALC (float *src1, float *src2, float *dst)
 
   for (i = 0; i < SIZE; i++)
     {
-      int tmp = (*(int *) &src1[i]) | (*(int *) &src2[i]);
-      dst[i] = *(float *) &tmp;
+      union U { float f; int i; } u1, u2;
+      u1.f = src1[i];
+      u2.f = src2[i];
+      u1.i |= u2.i;
+      dst[i] = u1.f;
     }
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vxorpd-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vxorpd-2.c
index 4f4a07e..068be60 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vxorpd-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vxorpd-2.c
@@ -15,8 +15,11 @@ CALC (double *src1, double *src2, double *dst)
 
   for (i = 0; i < SIZE; i++)
     {
-      long long tmp = (*(long long *) &src1[i]) ^ (*(long long *) &src2[i]);
-      dst[i] = *(double *) &tmp;
+      union U { double d; long long l; } u1, u2;
+      u1.d = src1[i];
+      u2.d = src2[i];
+      u1.l ^= u2.l;
+      dst[i] = u1.d;
     }
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/avx512dq-vxorps-2.c b/gcc/testsuite/gcc.target/i386/avx512dq-vxorps-2.c
index 144283e..716bb81 100644
--- a/gcc/testsuite/gcc.target/i386/avx512dq-vxorps-2.c
+++ b/gcc/testsuite/gcc.target/i386/avx512dq-vxorps-2.c
@@ -15,8 +15,11 @@ CALC (float *src1, float *src2, float *dst)
 
   for (i = 0; i < SIZE; i++)
     {
-      int tmp = (*(int *) &src1[i]) ^ (*(int *) &src2[i]);
-      dst[i] = *(float *) &tmp;
+      union U { float f; int i; } u1, u2;
+      u1.f = src1[i];
+      u2.f = src2[i];
+      u1.i ^= u2.i;
+      dst[i] = u1.f;
     }
 }