[libclc] [libclc] Move sqrt to CLC library (PR #128748)

[Fraser Cormack via cfe-commits]

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@@ -21,19 +21,17 @@
  */
 
 #if __CLC_FPSIZE == 64
-#define __CLC_NAN __builtin_nan("")
-#define ZERO 0.0
+#define __CLC_NAN DBL_NAN
 #elif __CLC_FPSIZE == 32
-#define __CLC_NAN NAN
-#define ZERO 0.0f
+#define __CLC_NAN FLT_NAN
 #elif __CLC_FPSIZE == 16
-#define __CLC_NAN (half)NAN
-#define ZERO 0.0h
+#define __CLC_NAN HALF_NAN
 #endif
 
-_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE __clc_sqrt(__CLC_GENTYPE val) {
-  return val < ZERO ? __CLC_NAN : __clc_llvm_intr_sqrt(val);
+__attribute__((weak)) _CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE
+__clc_sqrt(__CLC_GENTYPE val) {
+  return val < __CLC_FP_LIT(0.0) ? (__CLC_GENTYPE)__CLC_NAN
+                                 : __builtin_elementwise_sqrt(val);
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frasercrmck wrote:

Oh that's good to know, thanks. I couldn't see anything in the current LLVM or OpenCL specs, so just left it as-is.

https://github.com/llvm/llvm-project/pull/128748