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workaround bootstrapping limitations

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This commit is contained in:
Adrian Delgado 2023-03-22 13:22:25 -05:00
parent f34aa2d14f
commit d6ad69d40a
1 changed files with 36 additions and 4 deletions
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40
lib/std/math/log10.zig
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@ -1,4 +1,5 @@
const std = @import("../std.zig");
const builtin = @import("builtin");
const math = std.math;
const testing = std.testing;
const maxInt = std.math.maxInt;
@ -74,11 +75,26 @@ pub fn log10_int(x: anytype) Log2Int(@TypeOf(x)) {
}
fn pow10(comptime y: comptime_int) comptime_int {
var result = 1;
for (0..y) |_| {
result *= 10;
if (y == 0) return 1;
var squaring = 0;
var s = 1;
while (s <= y) : (s <<= 1) {
squaring += 1;
}
return result;
squaring -= 1;
var result = 10;
for (0..squaring) |_| {
result *= result;
}
const rest_exp = y - (1 << squaring);
return result * pow10(rest_exp);
}
inline fn log10_int_u8(x: u8) u32 {
@ -129,6 +145,14 @@ test "oldlog10 doesn't work" {
}
test "log10_int vs old implementation" {
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_llvm and comptime builtin.target.isWasm()) return error.SkipZigTest; // TODO
const int_types = .{ u8, u16, u32, u64, u128 };
inline for (int_types) |T| {
@ -144,6 +168,14 @@ test "log10_int vs old implementation" {
}
test "log10_int close to powers of 10" {
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_llvm and comptime builtin.target.isWasm()) return error.SkipZigTest; // TODO
const int_types = .{ u8, u16, u32, u64, u128, u256, u512 };
const max_log_values: [7]usize = .{ 2, 4, 9, 19, 38, 77, 154 };