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temporary fix for stage2/stage1 f128 rounding discrepency

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This is only to get tests running again. The root issue should be fixed
in stage1 so rounding is consistent between stages.
This commit is contained in:
Marc Tiehuis 2022-05-03 17:14:01 +12:00
parent bbfe2234c8
commit 5fbda2c579
2 changed files with 8 additions and 3 deletions
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1
lib/std/fmt.zig
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@ -1842,7 +1842,6 @@ pub const ParseFloatError = @import("fmt/parse_float.zig").ParseFloatError;
test {
_ = parseFloat;
_ = parseHexFloat;
}
pub fn charToDigit(c: u8, radix: u8) (error{InvalidCharacter}!u8) {

10
test/behavior/math.zig
View File

@ -778,8 +778,14 @@ test "quad hex float literal parsing accurate" {
try expect(@bitCast(u128, f) == 0x40042eab345678439abcdefea5678234);
}
{
var f: f128 = 0x1.edcb34a235253948765432134674fp-1;
try expect(@bitCast(u128, f) == 0x3ffeedcb34a235253948765432134674);
// TODO: modify stage1/parse_f128.c to use round-to-even
if (builtin.zig_backend == .stage1) {
var f: f128 = 0x1.edcb34a235253948765432134674fp-1;
try expect(@bitCast(u128, f) == 0x3ffeedcb34a235253948765432134674); // round-down
} else {
var f: f128 = 0x1.edcb34a235253948765432134674fp-1;
try expect(@bitCast(u128, f) == 0x3ffeedcb34a235253948765432134675); // round-to-even
}
}
{
var f: f128 = 0x1.353e45674d89abacc3a2ebf3ff4ffp-50;