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[builtins] Use __builtin_clzll for 64-bit types #99874

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Merged
merged 1 commit into from
Jul 22, 2024
Merged

[builtins] Use __builtin_clzll for 64-bit types #99874

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11 changes: 1 addition & 10 deletions compiler-rt/lib/builtins/fp_extend.h
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Original file line number Diff line number Diff line change
Expand Up @@ -37,16 +37,7 @@ static const int srcSigFracBits = 52;
// srcBits - srcSigFracBits - 1
static const int srcExpBits = 11;

static inline int src_rep_t_clz_impl(src_rep_t a) {
#if defined __LP64__
return __builtin_clzl(a);
#else
if (a & REP_C(0xffffffff00000000))
return clzsi(a >> 32);
else
return 32 + clzsi(a & REP_C(0xffffffff));
#endif
}
static inline int src_rep_t_clz_impl(src_rep_t a) { return __builtin_clzll(a); }
#define src_rep_t_clz src_rep_t_clz_impl

#elif defined SRC_80
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11 changes: 1 addition & 10 deletions compiler-rt/lib/builtins/fp_lib.h
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Original file line number Diff line number Diff line change
Expand Up @@ -58,16 +58,7 @@ typedef double fp_t;
#define REP_C UINT64_C
#define significandBits 52

static __inline int rep_clz(rep_t a) {
#if defined __LP64__
return __builtin_clzl(a);
#else
if (a & REP_C(0xffffffff00000000))
return clzsi(a >> 32);
else
return 32 + clzsi(a & REP_C(0xffffffff));
#endif
}
static inline int rep_clz(rep_t a) { return __builtin_clzll(a); }

#define loWord(a) (a & 0xffffffffU)
#define hiWord(a) (a >> 32)
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