use elementwise sqrt builtin and contract

frasercrmck · frasercrmck · commit fa3797064cd6 · 2025-02-27T15:04:50.000Z
diff --git a/libclc/clc/lib/generic/math/clc_rsqrt.cl b/libclc/clc/lib/generic/math/clc_rsqrt.cl
@@ -21,7 +21,6 @@
  */
 
 #include <clc/internal/clc.h>
-#include <clc/math/clc_sqrt.h>
 
 #define __CLC_BODY <clc_rsqrt.inc>
 #include <clc/math/gentype.inc>
diff --git a/libclc/clc/lib/generic/math/clc_rsqrt.inc b/libclc/clc/lib/generic/math/clc_rsqrt.inc
@@ -1,4 +1,5 @@
 __attribute__((weak)) _CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE
 __clc_rsqrt(__CLC_GENTYPE val) {
-  return __CLC_FP_LIT(1.0) / __clc_sqrt(val);
+#pragma clang fp contract(fast)
+  return __CLC_FP_LIT(1.0) / __builtin_elementwise_sqrt(val);
 }

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`__attribute__((weak)) _CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE`
`2`	`2`	`__clc_rsqrt(__CLC_GENTYPE val) {`
`3`		`- return __CLC_FP_LIT(1.0) / __clc_sqrt(val);`
	`3`	`+#pragma clang fp contract(fast)`
	`4`	`+ return __CLC_FP_LIT(1.0) / __builtin_elementwise_sqrt(val);`
`4`	`5`	`}`