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sat-arithmetic: fix shl methods in cbe

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Travis Staloch 2021-09-14 18:26:28 -07:00 committed by Andrew Kelley
parent 68050852fa
commit cd8d8add91
1 changed files with 10 additions and 6 deletions
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16
src/link/C/zig.h
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@ -428,17 +428,21 @@ zig_mul_sat_s(int, int, long)
zig_mul_sat_s(long, long, long long)
#define zig_shl_sat_u(ZT, T, bits) static inline T zig_shls_##ZT(T x, T y, T max) { \
T leading_zeros = __builtin_clz(x); \
return (leading_zeros + y > bits) ? max : x << y; \
if(x == 0) return 0; \
T bits_set = 64 - __builtin_clzll(x); \
return (bits_set + y > bits) ? max : x << y; \
}
#define zig_shl_sat_s(ZT, T, bits) static inline T zig_shls_##ZT(T x, T y, T min, T max) { \
T leading_zeros = __builtin_clz(x & ~max); \
return (leading_zeros + y > bits) ? max : x << y; \
if(x == 0) return 0; \
T x_twos_comp = x < 0 ? -x : x; \
T bits_set = 64 - __builtin_clzll(x_twos_comp); \
T min_or_max = (x < 0) ? min : max; \
return (y + bits_set > bits ) ? min_or_max : x << y; \
}
zig_shl_sat_u(u8, uint8_t, 8)
zig_shl_sat_s(i8, int8_t, 7)
zig_shl_sat_u(u8, uint8_t, 8)
zig_shl_sat_s(i8, int8_t, 7)
zig_shl_sat_u(u16, uint16_t, 16)
zig_shl_sat_s(i16, int16_t, 15)
zig_shl_sat_u(u32, uint32_t, 32)