Commit e4c053f047
Changed files (6)
lib
std
lib/std/special/compiler_rt/parity.zig
@@ -0,0 +1,40 @@
+const std = @import("std");
+const builtin = @import("builtin");
+
+// parity - if number of bits set is even => 0, else => 1
+// - pariytXi2_generic for big and little endian
+
+fn parityXi2_generic(comptime T: type) fn (a: T) callconv(.C) i32 {
+ return struct {
+ fn f(a: T) callconv(.C) i32 {
+ @setRuntimeSafety(builtin.is_test);
+
+ var x = switch (@bitSizeOf(T)) {
+ 32 => @bitCast(u32, a),
+ 64 => @bitCast(u64, a),
+ 128 => @bitCast(u128, a),
+ else => unreachable,
+ };
+ // Bit Twiddling Hacks: Compute parity in parallel
+ comptime var shift: u8 = @bitSizeOf(T) / 2;
+ inline while (shift > 2) {
+ x ^= x >> shift;
+ shift = shift >> 1;
+ }
+ x &= 0xf;
+ return (@intCast(u16, 0x6996) >> @intCast(u4, x)) & 1; // optimization for >>2 and >>1
+ }
+ }.f;
+}
+
+pub const __paritysi2 = parityXi2_generic(i32);
+
+pub const __paritydi2 = parityXi2_generic(i64);
+
+pub const __parityti2 = parityXi2_generic(i128);
+
+test {
+ _ = @import("paritysi2_test.zig");
+ _ = @import("paritydi2_test.zig");
+ _ = @import("parityti2_test.zig");
+}
lib/std/special/compiler_rt/paritydi2_test.zig
@@ -0,0 +1,35 @@
+const parity = @import("parity.zig");
+const testing = @import("std").testing;
+
+fn paritydi2Naive(a: i64) i32 {
+ var x = @bitCast(u64, a);
+ var has_parity: bool = false;
+ while (x > 0) {
+ has_parity = !has_parity;
+ x = x & (x - 1);
+ }
+ return @intCast(i32, @boolToInt(has_parity));
+}
+
+fn test__paritydi2(a: i64) !void {
+ var x = parity.__paritydi2(a);
+ var expected: i64 = paritydi2Naive(a);
+ try testing.expectEqual(expected, x);
+}
+
+test "paritydi2" {
+ try test__paritydi2(0);
+ try test__paritydi2(1);
+ try test__paritydi2(2);
+ try test__paritydi2(@bitCast(i64, @as(u64, 0xffffffff_fffffffd)));
+ try test__paritydi2(@bitCast(i64, @as(u64, 0xffffffff_fffffffe)));
+ try test__paritydi2(@bitCast(i64, @as(u64, 0xffffffff_ffffffff)));
+
+ const RndGen = @import("std").rand.DefaultPrng;
+ var rnd = RndGen.init(42);
+ var i: u32 = 0;
+ while (i < 10_000) : (i += 1) {
+ var rand_num = rnd.random().int(i64);
+ try test__paritydi2(rand_num);
+ }
+}
lib/std/special/compiler_rt/paritysi2_test.zig
@@ -0,0 +1,35 @@
+const parity = @import("parity.zig");
+const testing = @import("std").testing;
+
+fn paritysi2Naive(a: i32) i32 {
+ var x = @bitCast(u32, a);
+ var has_parity: bool = false;
+ while (x > 0) {
+ has_parity = !has_parity;
+ x = x & (x - 1);
+ }
+ return @intCast(i32, @boolToInt(has_parity));
+}
+
+fn test__paritysi2(a: i32) !void {
+ var x = parity.__paritysi2(a);
+ var expected: i32 = paritysi2Naive(a);
+ try testing.expectEqual(expected, x);
+}
+
+test "paritysi2" {
+ try test__paritysi2(0);
+ try test__paritysi2(1);
+ try test__paritysi2(2);
+ try test__paritysi2(@bitCast(i32, @as(u32, 0xfffffffd)));
+ try test__paritysi2(@bitCast(i32, @as(u32, 0xfffffffe)));
+ try test__paritysi2(@bitCast(i32, @as(u32, 0xffffffff)));
+
+ const RndGen = @import("std").rand.DefaultPrng;
+ var rnd = RndGen.init(42);
+ var i: u32 = 0;
+ while (i < 10_000) : (i += 1) {
+ var rand_num = rnd.random().int(i32);
+ try test__paritysi2(rand_num);
+ }
+}
lib/std/special/compiler_rt/parityti2_test.zig
@@ -0,0 +1,35 @@
+const parity = @import("parity.zig");
+const testing = @import("std").testing;
+
+fn parityti2Naive(a: i128) i32 {
+ var x = @bitCast(u128, a);
+ var has_parity: bool = false;
+ while (x > 0) {
+ has_parity = !has_parity;
+ x = x & (x - 1);
+ }
+ return @intCast(i32, @boolToInt(has_parity));
+}
+
+fn test__parityti2(a: i128) !void {
+ var x = parity.__parityti2(a);
+ var expected: i128 = parityti2Naive(a);
+ try testing.expectEqual(expected, x);
+}
+
+test "parityti2" {
+ try test__parityti2(0);
+ try test__parityti2(1);
+ try test__parityti2(2);
+ try test__parityti2(@bitCast(i128, @as(u128, 0xffffffff_ffffffff_ffffffff_fffffffd)));
+ try test__parityti2(@bitCast(i128, @as(u128, 0xffffffff_ffffffff_ffffffff_fffffffe)));
+ try test__parityti2(@bitCast(i128, @as(u128, 0xffffffff_ffffffff_ffffffff_ffffffff)));
+
+ const RndGen = @import("std").rand.DefaultPrng;
+ var rnd = RndGen.init(42);
+ var i: u32 = 0;
+ while (i < 10_000) : (i += 1) {
+ var rand_num = rnd.random().int(i128);
+ try test__parityti2(rand_num);
+ }
+}
lib/std/special/compiler_rt.zig
@@ -76,10 +76,11 @@ comptime {
@export(__extendhfsf2, .{ .name = "__gnu_h2f_ieee", .linkage = linkage });
- const __muloti4 = @import("compiler_rt/muloti4.zig").__muloti4;
- @export(__muloti4, .{ .name = "__muloti4", .linkage = linkage });
+ // Integral arithmetic which returns if overflow
const __mulodi4 = @import("compiler_rt/mulodi4.zig").__mulodi4;
@export(__mulodi4, .{ .name = "__mulodi4", .linkage = linkage });
+ const __muloti4 = @import("compiler_rt/muloti4.zig").__muloti4;
+ @export(__muloti4, .{ .name = "__muloti4", .linkage = linkage });
}
if (builtin.os.tag == .windows) {
@@ -217,6 +218,7 @@ comptime {
const __divtf3 = @import("compiler_rt/divtf3.zig").__divtf3;
@export(__divtf3, .{ .name = "__divtf3", .linkage = linkage });
+ // Integral bit manipulation
const __ashldi3 = @import("compiler_rt/shift.zig").__ashldi3;
@export(__ashldi3, .{ .name = "__ashldi3", .linkage = linkage });
const __ashlti3 = @import("compiler_rt/shift.zig").__ashlti3;
@@ -230,6 +232,33 @@ comptime {
const __lshrti3 = @import("compiler_rt/shift.zig").__lshrti3;
@export(__lshrti3, .{ .name = "__lshrti3", .linkage = linkage });
+ const __clzsi2 = @import("compiler_rt/count0bits.zig").__clzsi2;
+ @export(__clzsi2, .{ .name = "__clzsi2", .linkage = linkage });
+ const __clzdi2 = @import("compiler_rt/count0bits.zig").__clzdi2;
+ @export(__clzdi2, .{ .name = "__clzdi2", .linkage = linkage });
+ const __clzti2 = @import("compiler_rt/count0bits.zig").__clzti2;
+ @export(__clzti2, .{ .name = "__clzti2", .linkage = linkage });
+ const __ctzsi2 = @import("compiler_rt/count0bits.zig").__ctzsi2;
+ @export(__ctzsi2, .{ .name = "__ctzsi2", .linkage = linkage });
+ const __ctzdi2 = @import("compiler_rt/count0bits.zig").__ctzdi2;
+ @export(__ctzdi2, .{ .name = "__ctzdi2", .linkage = linkage });
+ const __ctzti2 = @import("compiler_rt/count0bits.zig").__ctzti2;
+ @export(__ctzti2, .{ .name = "__ctzti2", .linkage = linkage });
+
+ const __paritysi2 = @import("compiler_rt/parity.zig").__paritysi2;
+ @export(__paritysi2, .{ .name = "__paritysi2", .linkage = linkage });
+ const __paritydi2 = @import("compiler_rt/parity.zig").__paritydi2;
+ @export(__paritydi2, .{ .name = "__paritydi2", .linkage = linkage });
+ const __parityti2 = @import("compiler_rt/parity.zig").__parityti2;
+ @export(__parityti2, .{ .name = "__parityti2", .linkage = linkage });
+ const __popcountsi2 = @import("compiler_rt/popcount.zig").__popcountsi2;
+ @export(__popcountsi2, .{ .name = "__popcountsi2", .linkage = linkage });
+ const __popcountdi2 = @import("compiler_rt/popcount.zig").__popcountdi2;
+ @export(__popcountdi2, .{ .name = "__popcountdi2", .linkage = linkage });
+ const __popcountti2 = @import("compiler_rt/popcount.zig").__popcountti2;
+ @export(__popcountti2, .{ .name = "__popcountti2", .linkage = linkage });
+
+ // Integral / floating point conversion (part 1/2)
const __floatsidf = @import("compiler_rt/floatsiXf.zig").__floatsidf;
@export(__floatsidf, .{ .name = "__floatsidf", .linkage = linkage });
const __floatsisf = @import("compiler_rt/floatsiXf.zig").__floatsisf;
@@ -291,6 +320,7 @@ comptime {
const __extendsfdf2 = @import("compiler_rt/extendXfYf2.zig").__extendsfdf2;
@export(__extendsfdf2, .{ .name = "__extendsfdf2", .linkage = linkage });
+ // Integral / floating point conversion (part 2/2)
const __fixunssfsi = @import("compiler_rt/fixunssfsi.zig").__fixunssfsi;
@export(__fixunssfsi, .{ .name = "__fixunssfsi", .linkage = linkage });
const __fixunssfdi = @import("compiler_rt/fixunssfdi.zig").__fixunssfdi;
@@ -333,18 +363,13 @@ comptime {
const __udivmoddi4 = @import("compiler_rt/int.zig").__udivmoddi4;
@export(__udivmoddi4, .{ .name = "__udivmoddi4", .linkage = linkage });
- const __popcountsi2 = @import("compiler_rt/popcount.zig").__popcountsi2;
- @export(__popcountsi2, .{ .name = "__popcountsi2", .linkage = linkage });
- const __popcountdi2 = @import("compiler_rt/popcount.zig").__popcountdi2;
- @export(__popcountdi2, .{ .name = "__popcountdi2", .linkage = linkage });
- const __popcountti2 = @import("compiler_rt/popcount.zig").__popcountti2;
- @export(__popcountti2, .{ .name = "__popcountti2", .linkage = linkage });
if (is_darwin) {
const __isPlatformVersionAtLeast = @import("compiler_rt/os_version_check.zig").__isPlatformVersionAtLeast;
@export(__isPlatformVersionAtLeast, .{ .name = "__isPlatformVersionAtLeast", .linkage = linkage });
}
+ // Integral arithmetic
const __mulsi3 = @import("compiler_rt/int.zig").__mulsi3;
@export(__mulsi3, .{ .name = "__mulsi3", .linkage = linkage });
const __muldi3 = @import("compiler_rt/muldi3.zig").__muldi3;
@@ -372,24 +397,26 @@ comptime {
const __udivmodsi4 = @import("compiler_rt/int.zig").__udivmodsi4;
@export(__udivmodsi4, .{ .name = "__udivmodsi4", .linkage = linkage });
+ // missing: Integral arithmetic with trapping overflow
+
+ // missing: Integral arithmetic which returns if overflow
+
+ // missing: Integral comparison
+ // (a < b) => 0
+ // (a == b) => 1
+ // (a > b) => 2
+
+ // missing: Floating point raised to integer power
+
+ // missing: Complex arithmetic
+ // (a + ib) * (c + id)
+ // (a + ib) / (c + id)
+
const __negsf2 = @import("compiler_rt/negXf2.zig").__negsf2;
@export(__negsf2, .{ .name = "__negsf2", .linkage = linkage });
const __negdf2 = @import("compiler_rt/negXf2.zig").__negdf2;
@export(__negdf2, .{ .name = "__negdf2", .linkage = linkage });
- const __clzsi2 = @import("compiler_rt/count0bits.zig").__clzsi2;
- @export(__clzsi2, .{ .name = "__clzsi2", .linkage = linkage });
- const __clzdi2 = @import("compiler_rt/count0bits.zig").__clzdi2;
- @export(__clzdi2, .{ .name = "__clzdi2", .linkage = linkage });
- const __clzti2 = @import("compiler_rt/count0bits.zig").__clzti2;
- @export(__clzti2, .{ .name = "__clzti2", .linkage = linkage });
- const __ctzsi2 = @import("compiler_rt/count0bits.zig").__ctzsi2;
- @export(__ctzsi2, .{ .name = "__ctzsi2", .linkage = linkage });
- const __ctzdi2 = @import("compiler_rt/count0bits.zig").__ctzdi2;
- @export(__ctzdi2, .{ .name = "__ctzdi2", .linkage = linkage });
- const __ctzti2 = @import("compiler_rt/count0bits.zig").__ctzti2;
- @export(__ctzti2, .{ .name = "__ctzti2", .linkage = linkage });
-
if (builtin.link_libc and os_tag == .openbsd) {
const __emutls_get_address = @import("compiler_rt/emutls.zig").__emutls_get_address;
@export(__emutls_get_address, .{ .name = "__emutls_get_address", .linkage = linkage });
CMakeLists.txt
@@ -498,6 +498,7 @@ set(ZIG_STAGE2_SOURCES
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/multi3.zig"
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/negXf2.zig"
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/os_version_check.zig"
+ "${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/parity.zig"
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/popcount.zig"
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/shift.zig"
"${CMAKE_SOURCE_DIR}/lib/std/special/compiler_rt/stack_probe.zig"