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| author | Travis Staloch <twostepted@gmail.com> | 2021-09-14 18:26:28 -0700 |
|---|---|---|
| committer | Andrew Kelley <andrew@ziglang.org> | 2021-09-28 17:03:43 -0700 |
| commit | cd8d8add9153b17b4579c2e8951ac3f3f42e1bcd (patch) | |
| tree | 6e140beefb38a1ae50c2006aff0e12fc2ab0ce4e /src/link/C | |
| parent | 68050852fac6940d04e15900f135e6fc88845f9b (diff) | |
| download | zig-cd8d8add9153b17b4579c2e8951ac3f3f42e1bcd.tar.gz zig-cd8d8add9153b17b4579c2e8951ac3f3f42e1bcd.zip | |
sat-arithmetic: fix shl methods in cbe
Diffstat (limited to 'src/link/C')
| -rw-r--r-- | src/link/C/zig.h | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/src/link/C/zig.h b/src/link/C/zig.h index cb23492490..5c9d750729 100644 --- a/src/link/C/zig.h +++ b/src/link/C/zig.h @@ -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) |