[PPC64LE] Update builtins-ppc-altivec.c for PPC64 and PPC64LE

The Altivec builtin test case test/CodeGen/builtins-ppc-altivec.c has
always been executed only for 32-bit PowerPC.  These tests are equally
valid for 64-bit PowerPC.  This patch updates the test to be run for
three targets:  powerpc-unknown-unknown, powerpc64-unknown-unknown,
and powerpc64le-unknown-unknown.  The expected code generation changes
for some of the Altivec builtins for little endian, so this patch adds
new CHECK-LE variants to the test for the powerpc64le target.

These tests satisfy the testing requirements for some previous patches
committed over the last couple of days for lib/Headers/altivec.h:
r210279 for vec_perm, r210337 for vec_mul[eo], and r210340 for
vec_pack.

llvm-svn: 210384

1 files changed, 26 insertions, 0 deletions

diff --git a/clang/lib/Headers/altivec.h b/clang/lib/Headers/altivec.h
index 5719ab019d3..7dfb74e0698 100644
--- a/clang/lib/Headers/altivec.h
+++ b/clang/lib/Headers/altivec.h
@@ -8356,10 +8356,26 @@ vec_vsum4shs(vector signed short __a, vector int __b)
 
 /* vec_sum2s */
 
+/* The vsum2sws instruction has a big-endian bias, so that the second
+   input vector and the result always reference big-endian elements
+   1 and 3 (little-endian element 0 and 2).  For ease of porting the
+   programmer wants elements 1 and 3 in both cases, so for little
+   endian we must perform some permutes.  */
+
 static vector signed int __attribute__((__always_inline__))
 vec_sum2s(vector int __a, vector int __b)
 {
+#ifdef __LITTLE_ENDIAN__
+  vector int __c = (vector signed int)
+    vec_perm(__b, __b, (vector unsigned char)
+	     (4,5,6,7,0,1,2,3,12,13,14,15,8,9,10,11));
+  __c = __builtin_altivec_vsum2sws(__a, __c);
+  return (vector signed int)
+    vec_perm(__c, __c, (vector unsigned char)
+	     (4,5,6,7,0,1,2,3,12,13,14,15,8,9,10,11));
+#else
   return __builtin_altivec_vsum2sws(__a, __b);
+#endif
 }
 
 /* vec_vsum2sws */
@@ -8367,7 +8383,17 @@ vec_sum2s(vector int __a, vector int __b)
 static vector signed int __attribute__((__always_inline__))
 vec_vsum2sws(vector int __a, vector int __b)
 {
+#ifdef __LITTLE_ENDIAN__
+  vector int __c = (vector signed int)
+    vec_perm(__b, __b, (vector unsigned char)
+	     (4,5,6,7,0,1,2,3,12,13,14,15,8,9,10,11));
+  __c = __builtin_altivec_vsum2sws(__a, __c);
+  return (vector signed int)
+    vec_perm(__c, __c, (vector unsigned char)
+	     (4,5,6,7,0,1,2,3,12,13,14,15,8,9,10,11));
+#else
   return __builtin_altivec_vsum2sws(__a, __b);
+#endif
 }
 
 /* vec_sums */