[SystemZ] Avoid unnecessary conversions in vecintrin.h

uweigand · uweigand · commit cebba7ce3952 · 2020-01-16T18:58:14.000+01:00
Use floating-point instead of integer zero constants to avoid
creating implicit conversions, which currently cause suboptimal
code to be generated with -ffp-exception-behavior=strict.

NFC otherwise.
diff --git a/clang/lib/Headers/vecintrin.h b/clang/lib/Headers/vecintrin.h
@@ -290,7 +290,7 @@ vec_promote(unsigned long long __scalar, int __index) {
 #if __ARCH__ >= 12
 static inline __ATTRS_o_ai vector float
 vec_promote(float __scalar, int __index) {
-  const vector float __zero = (vector float)0;
+  const vector float __zero = (vector float)0.0f;
   vector float __vec = __builtin_shufflevector(__zero, __zero, -1, -1, -1, -1);
   __vec[__index & 3] = __scalar;
   return __vec;
@@ -299,7 +299,7 @@ vec_promote(float __scalar, int __index) {
 
 static inline __ATTRS_o_ai vector double
 vec_promote(double __scalar, int __index) {
-  const vector double __zero = (vector double)0;
+  const vector double __zero = (vector double)0.0;
   vector double __vec = __builtin_shufflevector(__zero, __zero, -1, -1);
   __vec[__index & 1] = __scalar;
   return __vec;
@@ -366,15 +366,15 @@ vec_insert_and_zero(const unsigned long long *__ptr) {
 #if __ARCH__ >= 12
 static inline __ATTRS_o_ai vector float
 vec_insert_and_zero(const float *__ptr) {
-  vector float __vec = (vector float)0;
+  vector float __vec = (vector float)0.0f;
   __vec[1] = *__ptr;
   return __vec;
 }
 #endif
 
 static inline __ATTRS_o_ai vector double
 vec_insert_and_zero(const double *__ptr) {
-  vector double __vec = (vector double)0;
+  vector double __vec = (vector double)0.0;
   __vec[0] = *__ptr;
   return __vec;
 }
