[clang] 43f314f - clang/HIP: Use abs builtins instead of implementing them

[Matt Arsenault via cfe-commits]

Author: Matt Arsenault
Date: 2023-08-15T17:40:19-04:00
New Revision: 43f314f5e6cebe02ff63d5197c8e5c25204b20d2

URL: https://github.com/llvm/llvm-project/commit/43f314f5e6cebe02ff63d5197c8e5c25204b20d2
DIFF: https://github.com/llvm/llvm-project/commit/43f314f5e6cebe02ff63d5197c8e5c25204b20d2.diff

LOG: clang/HIP: Use abs builtins instead of implementing them

InstCombine already put these back together so there's no visible
change in the -O1 test for the header.

Added: 
    

Modified: 
    clang/lib/Headers/__clang_hip_math.h

Removed: 
    


################################################################################
diff  --git a/clang/lib/Headers/__clang_hip_math.h b/clang/lib/Headers/__clang_hip_math.h
index 8721167304a665..120961967d840f 100644
--- a/clang/lib/Headers/__clang_hip_math.h
+++ b/clang/lib/Headers/__clang_hip_math.h
@@ -315,18 +315,15 @@ float __tanf(float __x) {
 #if defined(__cplusplus)
 __DEVICE__
 int abs(int __x) {
-  int __sgn = __x >> (sizeof(int) * CHAR_BIT - 1);
-  return (__x ^ __sgn) - __sgn;
+  return __builtin_abs(__x);
 }
 __DEVICE__
 long labs(long __x) {
-  long __sgn = __x >> (sizeof(long) * CHAR_BIT - 1);
-  return (__x ^ __sgn) - __sgn;
+  return __builtin_labs(__x);
 }
 __DEVICE__
 long long llabs(long long __x) {
-  long long __sgn = __x >> (sizeof(long long) * CHAR_BIT - 1);
-  return (__x ^ __sgn) - __sgn;
+  return __builtin_llabs(__x);
 }
 #endif