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Better strcasestr.

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This commit is contained in:
Nuno Cruces
2025-06-02 10:25:10 +01:00
parent 9142e19d61
commit b64b9b0415
3 changed files with 112 additions and 79 deletions
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BIN
sqlite3/libc/libc.wasm
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175
sqlite3/libc/libc.wat
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@@ -3700,10 +3700,13 @@
(local $6 i32)
(local $7 i32)
(local $8 i32)
(local $9 v128)
(local $9 i32)
(local $10 v128)
(local $11 v128)
(local $12 v128)
(local $13 v128)
(local $14 v128)
(local $15 v128)
(if
(i32.eqz
(local.tee $2
@@ -3718,7 +3721,7 @@
)
)
)
(local.set $5
(local.set $3
(i32.extend8_s
(local.get $2)
)
@@ -3738,17 +3741,17 @@
)
)
)
(local.set $4
(local.set $5
(local.get $6)
)
(loop $label
(if
(i32.ne
(local.tee $3
(local.tee $4
(i32.load8_u
(i32.add
(local.get $1)
(local.get $4)
(local.get $5)
)
)
)
@@ -3756,15 +3759,15 @@
)
(then
(local.set $2
(local.get $3)
(local.get $4)
)
(br $block)
)
)
(br_if $label
(local.tee $4
(local.tee $5
(i32.sub
(local.get $4)
(local.get $5)
(i32.const 1)
)
)
@@ -3778,27 +3781,43 @@
)
)
)
(local.set $4
(local.set $5
(local.get $6)
)
)
(local.set $3
(local.set $4
(select
(i32.or
(local.get $5)
(local.get $3)
(i32.const 32)
)
(local.get $5)
(local.get $3)
(i32.lt_u
(i32.sub
(local.get $5)
(local.get $3)
(i32.const 65)
)
(i32.const 26)
)
)
)
(local.set $2
(local.set $3
(select
(i32.and
(local.get $3)
(i32.const 95)
)
(local.get $3)
(i32.lt_u
(i32.sub
(local.get $3)
(i32.const 97)
)
(i32.const 26)
)
)
)
(local.set $8
(select
(i32.or
(local.tee $2
@@ -3818,19 +3837,35 @@
)
)
)
(local.set $2
(select
(i32.and
(local.get $2)
(i32.const 95)
)
(local.get $2)
(i32.lt_u
(i32.sub
(local.get $2)
(i32.const 97)
)
(i32.const 26)
)
)
)
(block $block3
(block $block4
(block $block1
(br_if $block1
(i32.lt_u
(local.tee $5
(local.tee $9
(i32.sub
(i32.sub
(i32.shl
(memory.size)
(i32.const 16)
)
(local.get $4)
(local.get $5)
)
(i32.const 16)
)
@@ -3838,17 +3873,27 @@
(local.get $0)
)
)
(local.set $10
(local.set $11
(i8x16.splat
(local.get $4)
)
)
(local.set $12
(i8x16.splat
(local.get $3)
)
)
(local.set $11
(local.set $13
(i8x16.splat
(local.get $8)
)
)
(local.set $14
(i8x16.splat
(local.get $2)
)
)
(local.set $8
(local.set $3
(i32.add
(local.get $1)
(i32.const 1)
@@ -3857,24 +3902,9 @@
(loop $label2
(local.set $2
(i8x16.all_true
(local.tee $9
(v128.or
(v128.bitselect
(v128.const i32x4 0x20202020 0x20202020 0x20202020 0x20202020)
(v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
(i8x16.gt_s
(i8x16.add
(local.tee $9
(v128.load align=1
(local.get $0)
)
)
(v128.const i32x4 0x25252525 0x25252525 0x25252525 0x25252525)
)
(v128.const i32x4 0x65656565 0x65656565 0x65656565 0x65656565)
)
)
(local.get $9)
(local.tee $10
(v128.load align=1
(local.get $0)
)
)
)
@@ -3882,35 +3912,34 @@
(block $block2
(if
(v128.any_true
(local.tee $9
(local.tee $10
(v128.and
(i8x16.eq
(local.get $11)
(v128.or
(v128.bitselect
(v128.const i32x4 0x20202020 0x20202020 0x20202020 0x20202020)
(v128.const i32x4 0x00000000 0x00000000 0x00000000 0x00000000)
(i8x16.gt_s
(i8x16.add
(local.tee $12
(v128.load align=1
(i32.add
(local.get $0)
(local.get $4)
)
)
)
(v128.const i32x4 0x25252525 0x25252525 0x25252525 0x25252525)
(v128.or
(i8x16.eq
(local.get $13)
(local.tee $15
(v128.load align=1
(i32.add
(local.get $0)
(local.get $5)
)
(v128.const i32x4 0x65656565 0x65656565 0x65656565 0x65656565)
)
)
(local.get $12)
)
(i8x16.eq
(local.get $14)
(local.get $15)
)
)
(i8x16.eq
(local.get $10)
(local.get $9)
(v128.or
(i8x16.eq
(local.get $11)
(local.get $10)
)
(i8x16.eq
(local.get $12)
(local.get $10)
)
)
)
)
@@ -3925,7 +3954,7 @@
(i32.eqz
(local.tee $2
(i8x16.bitmask
(local.get $9)
(local.get $10)
)
)
)
@@ -3935,7 +3964,7 @@
(i32.eqz
(call $strncasecmp
(i32.add
(local.tee $3
(local.tee $4
(i32.add
(local.get $0)
(i32.ctz
@@ -3945,7 +3974,7 @@
)
(i32.const 1)
)
(local.get $8)
(local.get $3)
(local.get $6)
)
)
@@ -3979,12 +4008,12 @@
(i32.const 16)
)
)
(local.get $5)
(local.get $9)
)
)
)
)
(local.set $3
(local.set $4
(local.get $0)
)
(local.set $2
@@ -3997,7 +4026,7 @@
(i32.load8_s
(i32.add
(local.get $2)
(local.get $3)
(local.get $4)
)
)
)
@@ -4007,7 +4036,7 @@
(i32.eq
(select
(i32.or
(local.tee $4
(local.tee $5
(i32.load8_s
(i32.add
(local.get $1)
@@ -4017,10 +4046,10 @@
)
(i32.const 32)
)
(local.get $4)
(local.get $5)
(i32.lt_u
(i32.sub
(local.get $4)
(local.get $5)
(i32.const 65)
)
(i32.const 26)
@@ -4055,9 +4084,9 @@
)
)
(else
(local.set $3
(local.set $4
(i32.add
(local.get $3)
(local.get $4)
(i32.const 1)
)
)
@@ -4070,11 +4099,11 @@
)
(unreachable)
)
(local.set $3
(local.set $4
(i32.const 0)
)
)
(local.get $3)
(local.get $4)
)
(func $memccpy (param $0 i32) (param $1 i32) (param $2 i32) (param $3 i32) (result i32)
(memory.copy

16
sqlite3/libc/string.h
View File

@@ -616,18 +616,22 @@ char *strcasestr(const char *haystk, const char *needle) {
while (i > 0 && needle[0] == needle[i]) i--;
if (i == 0) i = sn - 1;
const v128_t fst = wasm_i8x16_splat(tolower(needle[0]));
const v128_t lst = wasm_i8x16_splat(tolower(needle[i]));
const v128_t fstl = wasm_i8x16_splat(tolower(needle[0]));
const v128_t fstu = wasm_i8x16_splat(toupper(needle[0]));
const v128_t lstl = wasm_i8x16_splat(tolower(needle[i]));
const v128_t lstu = wasm_i8x16_splat(toupper(needle[i]));
// The last haystk offset for which loading blk_lst is safe.
const char *H =
(char *)(__builtin_wasm_memory_size(0) * PAGESIZE - i - sizeof(v128_t));
while (haystk <= H) {
const v128_t blk_fst = __tolower8x16(wasm_v128_load((v128_t *)(haystk)));
const v128_t blk_lst = __tolower8x16(wasm_v128_load((v128_t *)(haystk + i)));
const v128_t eq_fst = wasm_i8x16_eq(fst, blk_fst);
const v128_t eq_lst = wasm_i8x16_eq(lst, blk_lst);
const v128_t blk_fst = wasm_v128_load((v128_t *)(haystk));
const v128_t blk_lst = wasm_v128_load((v128_t *)(haystk + i));
const v128_t eq_fst =
wasm_i8x16_eq(fstl, blk_fst) | wasm_i8x16_eq(fstu, blk_fst);
const v128_t eq_lst =
wasm_i8x16_eq(lstl, blk_lst) | wasm_i8x16_eq(lstu, blk_lst);
const v128_t cmp = eq_fst & eq_lst;
if (wasm_v128_any_true(cmp)) {