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Avoid UB.

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Nuno Cruces
2025-07-14 14:21:37 +01:00
parent 14b98a5d05
commit b4e8fcb752
1 changed files with 6 additions and 8 deletions
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14
sqlite3/libc/string.h
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@@ -5,7 +5,6 @@
#include <stdint.h>
#include <wasm_simd128.h>
#include <__macro_PAGESIZE.h>
#ifdef __cplusplus
extern "C" {
@@ -244,16 +243,16 @@ char *strrchr(const char *s, int c) {
// http://0x80.pl/notesen/2018-10-18-simd-byte-lookup.html
typedef struct {
__u8x16 l;
__u8x16 h;
__u8x16 lo;
__u8x16 hi;
} __wasm_v128_bitmap256_t;
__attribute__((always_inline))
static void __wasm_v128_setbit(__wasm_v128_bitmap256_t *bitmap, int i) {
uint8_t hi_nibble = (uint8_t)i >> 4;
uint8_t lo_nibble = (uint8_t)i & 0xf;
bitmap->l[lo_nibble] |= 1 << (hi_nibble - 0);
bitmap->h[lo_nibble] |= 1 << (hi_nibble - 8);
bitmap->lo[lo_nibble] |= (uint8_t)((uint32_t)1 << (hi_nibble - 0));
bitmap->hi[lo_nibble] |= (uint8_t)((uint32_t)1 << (hi_nibble - 8));
}
#ifndef __wasm_relaxed_simd__
@@ -272,11 +271,10 @@ static v128_t __wasm_v128_chkbits(__wasm_v128_bitmap256_t bitmap, v128_t v) {
v128_t indices_0_7 = v & wasm_u8x16_const_splat(0x8f);
v128_t indices_8_15 = indices_0_7 ^ wasm_u8x16_const_splat(0x80);
v128_t row_0_7 = wasm_i8x16_swizzle(bitmap.l, indices_0_7);
v128_t row_8_15 = wasm_i8x16_swizzle(bitmap.h, indices_8_15);
v128_t row_0_7 = wasm_i8x16_swizzle(bitmap.lo, indices_0_7);
v128_t row_8_15 = wasm_i8x16_swizzle(bitmap.hi, indices_8_15);
v128_t bitsets = row_0_7 | row_8_15;
return wasm_i8x16_eq(bitsets & bitmask, bitmask);
}