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Nuno Cruces
2025-04-07 01:32:15 +01:00
parent 2043d5fca4
commit a3ce8f9de5
5 changed files with 377 additions and 3 deletions
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5
sqlite3/libc/build.sh
View File

@@ -21,10 +21,13 @@ trap 'rm -f libc.tmp' EXIT
-Wl,--initial-memory=16777216 \
-Wl,--export=memset \
-Wl,--export=memcpy \
-Wl,--export=memchr \
-Wl,--export=memcmp \
-Wl,--export=strlen \
-Wl,--export=strchr \
-Wl,--export=strcmp \
-Wl,--export=strncmp
-Wl,--export=strncmp \
-Wl,--export=strchrnul
"$BINARYEN/wasm-ctor-eval" -g -c _initialize libc.wasm -o libc.tmp
"$BINARYEN/wasm-opt" -g --strip --strip-producers -c -O3 \

BIN
sqlite3/libc/libc.wasm
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286
sqlite3/libc/libc.wat
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@@ -1,16 +1,19 @@
(module $libc.wasm
(type $0 (func (param i32 i32 i32) (result i32)))
(type $1 (func (param i32) (result i32)))
(type $2 (func (param i32 i32) (result i32)))
(type $1 (func (param i32 i32) (result i32)))
(type $2 (func (param i32) (result i32)))
(memory $0 256)
(data $0 (i32.const 1024) "\01")
(export "memory" (memory $0))
(export "memset" (func $memset))
(export "memcpy" (func $memcpy))
(export "memcmp" (func $memcmp))
(export "memchr" (func $memchr))
(export "strlen" (func $strlen))
(export "strcmp" (func $strcmp))
(export "strncmp" (func $strncmp))
(export "strchrnul" (func $strchrnul))
(export "strchr" (func $strchr))
(func $memset (param $0 i32) (param $1 i32) (param $2 i32) (result i32)
(memory.fill
(local.get $0)
@@ -130,6 +133,96 @@
)
(i32.const 0)
)
(func $memchr (param $0 i32) (param $1 i32) (param $2 i32) (result i32)
(local $3 v128)
(block $block2
(block $block1
(block $block
(if
(i32.ge_u
(local.get $2)
(i32.const 16)
)
(then
(local.set $3
(i8x16.splat
(local.get $1)
)
)
(loop $label
(br_if $block
(v128.any_true
(i8x16.eq
(v128.load align=1
(local.get $0)
)
(local.get $3)
)
)
)
(local.set $0
(i32.add
(local.get $0)
(i32.const 16)
)
)
(br_if $label
(i32.gt_u
(local.tee $2
(i32.sub
(local.get $2)
(i32.const 16)
)
)
(i32.const 15)
)
)
)
)
)
(br_if $block1
(i32.eqz
(local.get $2)
)
)
)
(local.set $1
(i32.and
(local.get $1)
(i32.const 255)
)
)
(loop $label1
(br_if $block2
(i32.eq
(i32.load8_u
(local.get $0)
)
(local.get $1)
)
)
(local.set $0
(i32.add
(local.get $0)
(i32.const 1)
)
)
(br_if $label1
(local.tee $2
(i32.sub
(local.get $2)
(i32.const 1)
)
)
)
)
)
(local.set $0
(i32.const 0)
)
)
(local.get $0)
)
(func $strlen (param $0 i32) (result i32)
(local $1 i32)
(local $2 i32)
@@ -490,6 +583,195 @@
)
(i32.const 0)
)
(func $strchrnul (param $0 i32) (param $1 i32) (result i32)
(local $2 i32)
(local $3 v128)
(local $4 v128)
(block $block
(br_if $block
(i32.lt_u
(local.tee $2
(i32.sub
(i32.shl
(memory.size)
(i32.const 16)
)
(i32.const 16)
)
)
(local.get $0)
)
)
(local.set $3
(i8x16.splat
(local.get $1)
)
)
(loop $label
(br_if $block
(i32.eqz
(i8x16.all_true
(local.tee $4
(v128.load align=1
(local.get $0)
)
)
)
)
)
(br_if $block
(v128.any_true
(i8x16.eq
(local.get $4)
(local.get $3)
)
)
)
(br_if $label
(i32.le_u
(local.tee $0
(i32.add
(local.get $0)
(i32.const 16)
)
)
(local.get $2)
)
)
)
)
(local.set $1
(i32.extend8_s
(local.get $1)
)
)
(local.set $0
(i32.sub
(local.get $0)
(i32.const 1)
)
)
(loop $label1
(br_if $label1
(select
(local.tee $2
(i32.load8_s
(local.tee $0
(i32.add
(local.get $0)
(i32.const 1)
)
)
)
)
(i32.const 0)
(i32.ne
(local.get $1)
(local.get $2)
)
)
)
)
(local.get $0)
)
(func $strchr (param $0 i32) (param $1 i32) (result i32)
(local $2 i32)
(local $3 v128)
(local $4 v128)
(block $block
(br_if $block
(i32.lt_u
(local.tee $2
(i32.sub
(i32.shl
(memory.size)
(i32.const 16)
)
(i32.const 16)
)
)
(local.get $0)
)
)
(local.set $3
(i8x16.splat
(local.get $1)
)
)
(loop $label
(br_if $block
(i32.eqz
(i8x16.all_true
(local.tee $4
(v128.load align=1
(local.get $0)
)
)
)
)
)
(br_if $block
(v128.any_true
(i8x16.eq
(local.get $4)
(local.get $3)
)
)
)
(br_if $label
(i32.le_u
(local.tee $0
(i32.add
(local.get $0)
(i32.const 16)
)
)
(local.get $2)
)
)
)
)
(local.set $1
(i32.extend8_s
(local.get $1)
)
)
(local.set $0
(i32.sub
(local.get $0)
(i32.const 1)
)
)
(loop $label1
(br_if $label1
(select
(local.tee $2
(i32.load8_s
(local.tee $0
(i32.add
(local.get $0)
(i32.const 1)
)
)
)
)
(i32.const 0)
(i32.ne
(local.get $1)
(local.get $2)
)
)
)
)
(select
(local.get $0)
(i32.const 0)
(i32.eq
(local.get $1)
(local.get $2)
)
)
)
;; features section: mutable-globals, nontrapping-float-to-int, simd, bulk-memory, sign-ext, reference-types, multivalue, bulk-memory-opt
)

38
sqlite3/libc/libc_test.go
View File

@@ -25,8 +25,10 @@ var (
memset api.Function
memcpy api.Function
memcmp api.Function
memchr api.Function
strlen api.Function
strcmp api.Function
strchr api.Function
strncmp api.Function
stack [8]uint64
)
@@ -49,8 +51,10 @@ func TestMain(m *testing.M) {
module = mod
memset = mod.ExportedFunction("memset")
memcpy = mod.ExportedFunction("memcpy")
memchr = mod.ExportedFunction("memchr")
memcmp = mod.ExportedFunction("memcmp")
strlen = mod.ExportedFunction("strlen")
strchr = mod.ExportedFunction("strchr")
strcmp = mod.ExportedFunction("strcmp")
strncmp = mod.ExportedFunction("strncmp")
memory, _ = mod.Memory().Read(0, mod.Memory().Size())
@@ -93,6 +97,23 @@ func Benchmark_memcpy(b *testing.B) {
}
}
func Benchmark_memchr(b *testing.B) {
clear(memory)
call(memset, ptr1, 7, size)
call(memset, ptr1+size/2, 5, size)
b.SetBytes(size / 2)
b.ResetTimer()
for range b.N {
call(memchr, ptr1, 5, size)
}
b.StopTimer()
if got := call(memchr, ptr1, 5, size); got != ptr1+size/2 {
b.Fatal(got)
}
}
func Benchmark_memcmp(b *testing.B) {
clear(memory)
call(memset, ptr1, 7, size)
@@ -132,6 +153,23 @@ func Benchmark_strlen(b *testing.B) {
}
}
func Benchmark_strchr(b *testing.B) {
clear(memory)
call(memset, ptr1, 7, size)
call(memset, ptr1+size/2, 5, size)
b.SetBytes(size / 2)
b.ResetTimer()
for range b.N {
call(strchr, ptr1, 5)
}
b.StopTimer()
if got := call(strchr, ptr1, 5); got != ptr1+size/2 {
b.Fatal(got)
}
}
func Benchmark_strcmp(b *testing.B) {
clear(memory)
call(memset, ptr1, 7, size-1)

51
sqlite3/strings.c
View File

@@ -43,6 +43,26 @@ int memcmp(const void *v1, const void *v2, size_t n) {
return 0;
}
void *memchr(const void *v, int c, size_t n) {
c = (uint8_t)c;
const v128_t wc = wasm_i8x16_splat(c);
const v128_t *w = (void *)v;
for (; n >= sizeof(v128_t); n -= sizeof(v128_t)) {
if (wasm_v128_any_true(wasm_i8x16_eq(wasm_v128_load(w), wc))) {
break; // *w has a c
}
w++;
}
const uint8_t *u = (void *)w;
while (n--) {
if (*u == c) return (void *)u;
u++;
}
return 0;
}
size_t strlen(const char *s) {
const v128_t *const limit =
(v128_t *)(__builtin_wasm_memory_size(0) * PAGESIZE) - 1;
@@ -116,4 +136,35 @@ int strncmp(const char *s1, const char *s2, size_t n) {
return 0;
}
char *strchrnul(const char *s, int c) {
c = (char)c;
const v128_t *const limit =
(v128_t *)(__builtin_wasm_memory_size(0) * PAGESIZE) - 1;
const v128_t wc = wasm_i8x16_splat(c);
const v128_t *w = (void *)s;
while (w <= limit) {
if (!wasm_i8x16_all_true(wasm_v128_load(w))) {
break; // *w has a NUL
}
if (wasm_v128_any_true(wasm_i8x16_eq(wasm_v128_load(w), wc))) {
break; // *w has a c
}
w++;
}
s = (void *)w;
while (true) {
if (*s == 0 || *s == c) break;
s++;
}
return (void *)s;
}
char *strchr(const char *s, int c) {
char *r = strchrnul(s, c);
return *(char *)r == (char)c ? r : 0;
}
#endif