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x86_64: implement switch jump tables

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This commit is contained in:
Jacob Young
2025-01-02 03:10:19 -05:00
parent ac1a975f9b
commit e5d5a8bc4e
33 changed files with 476 additions and 199 deletions
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6
lib/std/Thread/Condition.zig
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@@ -161,17 +161,17 @@ const WindowsImpl = struct {
}
}
if (comptime builtin.mode == .Debug) {
if (builtin.mode == .Debug) {
// The internal state of the DebugMutex needs to be handled here as well.
mutex.impl.locking_thread.store(0, .unordered);
}
const rc = os.windows.kernel32.SleepConditionVariableSRW(
&self.condition,
if (comptime builtin.mode == .Debug) &mutex.impl.impl.srwlock else &mutex.impl.srwlock,
if (builtin.mode == .Debug) &mutex.impl.impl.srwlock else &mutex.impl.srwlock,
timeout_ms,
0, // the srwlock was assumed to acquired in exclusive mode not shared
);
if (comptime builtin.mode == .Debug) {
if (builtin.mode == .Debug) {
// The internal state of the DebugMutex needs to be handled here as well.
mutex.impl.locking_thread.store(std.Thread.getCurrentId(), .unordered);
}

2
lib/std/Thread/Mutex.zig
View File

@@ -158,7 +158,7 @@ const FutexImpl = struct {
// On x86, use `lock bts` instead of `lock cmpxchg` as:
// - they both seem to mark the cache-line as modified regardless: https://stackoverflow.com/a/63350048
// - `lock bts` is smaller instruction-wise which makes it better for inlining
if (comptime builtin.target.cpu.arch.isX86()) {
if (builtin.target.cpu.arch.isX86()) {
const locked_bit = @ctz(locked);
return self.state.bitSet(locked_bit, .acquire) == 0;
}