diff options
Diffstat (limited to 'lib/builtins/ctzdi2.c')
| -rw-r--r-- | lib/builtins/ctzdi2.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/builtins/ctzdi2.c b/lib/builtins/ctzdi2.c index eecde29718d7..ef6d7fea1365 100644 --- a/lib/builtins/ctzdi2.c +++ b/lib/builtins/ctzdi2.c @@ -16,8 +16,13 @@ /* Returns: the number of trailing 0-bits */ -#if !defined(__clang__) && (defined(__sparc64__) || defined(__mips64) || defined(__riscv__)) -/* gcc resolves __builtin_ctz -> __ctzdi2 leading to infinite recursion */ +#if !defined(__clang__) && \ + ((defined(__sparc__) && defined(__arch64__)) || \ + defined(__mips64) || \ + (defined(__riscv) && __SIZEOF_POINTER__ >= 8)) +/* On 64-bit architectures with neither a native clz instruction nor a native + * ctz instruction, gcc resolves __builtin_ctz to __ctzdi2 rather than + * __ctzsi2, leading to infinite recursion. */ #define __builtin_ctz(a) __ctzsi2(a) extern si_int __ctzsi2(si_int); #endif |