David Rubin 938efe4aab compiler-rt: fix f80 ceil/floor optimization ...

Our implementation did the classic add-sub rounding trick `(y = x +/- C =+ C - x)`
with `C = 1 / eps(T) = 2^(mantissa - 1)`. This approach only works for values whose
magnitude is below the rounding capacity of the constant. For a 64-bit mantissa
(like f80 has), `C = 2^63` only rounds for `|x| < 2^63`. Before we allowed this to
be ran on `e < bias + 64` aka `|x| < 2^64`. And because it isn't large enough,
we lose a bit to rounding.

For reference, the musl implementation does the same thing, using `mantissa - 1`:
https://git.musl-libc.org/cgit/musl/tree/src/math/ceill.c#n18
where `LDBL_MANT_DIG` is 64 for `long double` on x86.

This commit also combines the floor and ceil implementations into one generic one.

2026-01-08 00:45:52 +01:00

..

conflicting_externs

categorize behavior/bugs/<issueno>.zig tests

2024-01-06 16:49:41 -08:00

hasdecl

move behavior tests from test/stage1/ to test/

2021-04-29 15:54:04 -07:00

import

move behavior tests from test/stage1/ to test/

2021-04-29 15:54:04 -07:00

namespace_depends_on_compile_var

move behavior tests from test/stage1/ to test/

2021-04-29 15:54:04 -07:00

pub_enum

move behavior tests from test/stage1/ to test/

2021-04-29 15:54:04 -07:00

x86_64

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

zon

compiler: allow @import of ZON without a result type

2025-04-02 05:53:22 +01:00

abs.zig

Return a usize from @abs if given an isize

2025-11-29 21:09:08 +01:00

addrspace_and_linksection.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

align.zig

aarch64: enable fixed behavior

2025-09-20 18:33:00 -07:00

alignof.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

array.zig

add behavior test: resist alias of explicit copy...

2025-09-20 18:51:26 -07:00

asm.zig

test: skip alternative constraints behavior test on LoongArch

2025-09-18 12:42:14 +02:00

atomics.zig

llvm: fix atomic widening of packed structs

2025-07-30 09:56:38 +01:00

basic.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

bit_shifting.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

bitcast.zig

test: skip bitcast nan float does not modify signaling bit on powerpc

2025-12-16 06:23:06 +01:00

bitreverse.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

bool.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

builtin_functions_returning_void_or_noreturn.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

byteswap.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

byval_arg_var.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

call.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

cast_int.zig

behavior tests: update for new requirement

2025-09-05 19:44:54 -07:00

cast.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

comptime_memory.zig

test: skip tests that were not meant to pass for spirv

2025-08-09 13:27:45 +03:30

const_slice_child.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

decl_literals.zig

aarch64: implement more optional/error union/union support

2025-07-26 21:39:50 -04:00

decltest.zig

riscv: math progress

2024-05-11 02:17:24 -07:00

defer.zig

aarch64: workaround some optional/union issues

2025-07-28 09:03:17 -07:00

destructure.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

duplicated_test_names.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

empty_union.zig

riscv: std.fmt.format running

2024-06-13 02:20:47 -07:00

enum.zig

stage2_wasm: revival, enabling tests

2025-12-07 07:21:15 +01:00

error.zig

sema: fix error_return_trace_index handling in zirCondBr

2025-12-07 07:20:59 +01:00

eval.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

export_builtin.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

export_c_keywords.zig

lib,test,tools,doc: update usages of @export

2024-08-27 00:44:35 +01:00

export_keyword.zig

Coff2: create a new linker from scratch

2025-10-02 17:44:52 -04:00

export_self_referential_type_info.zig

std: update std.builtin.Type fields to follow naming conventions

2024-08-28 08:39:59 +01:00

extern_struct_zero_size_fields.zig

test: update behavior to silence 'var is never mutated' errors

2023-11-19 09:57:03 +00:00

extern.zig

Coff2: create a new linker from scratch

2025-10-02 17:44:52 -04:00

field_parent_ptr.zig

stage2_wasm: revival, enabling tests

2025-12-07 07:21:15 +01:00

file_to_embed.txt

rename behavior test to better describe what it does

2023-10-23 17:28:10 -07:00

floatop.zig

compiler-rt: fix f80 ceil/floor optimization

2026-01-08 00:45:52 +01:00

fn_delegation.zig

riscv: std.fmt.format running

2024-06-13 02:20:47 -07:00

fn_in_struct_in_comptime.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

fn.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

for.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

generics.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

globals.zig

aarch64: enable fixed behavior

2025-09-20 18:33:00 -07:00

hasdecl.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

hasfield.zig

Sema: make @hasField support tuples too

2022-03-11 12:59:20 -07:00

if.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

import_c_keywords.zig

Coff2: create a new linker from scratch

2025-10-02 17:44:52 -04:00

import.zig

remove usingnamespace from the language

2025-07-07 13:39:48 -07:00

incomplete_struct_param_tld.zig

riscv: std.fmt.format running

2024-06-13 02:20:47 -07:00

inline_switch.zig

aarch64: implement more optional/error union/union support

2025-07-26 21:39:50 -04:00

int128.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

int_comparison_elision.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

ir_block_deps.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

lower_strlit_to_vector.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

math.zig

Coff2: create a new linker from scratch

2025-10-02 17:44:52 -04:00

maximum_minimum.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

member_func.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

memcpy.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

memmove.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

memset.zig

x86_64: continue hacking around unimplemented linker logic

2025-10-29 19:31:44 -04:00

merge_error_sets.zig

riscv: std.fmt.format running

2024-06-13 02:20:47 -07:00

muladd.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

multiple_externs_with_conflicting_types.zig

Coff2: create a new linker from scratch

2025-10-02 17:44:52 -04:00

namespace_depends_on_compile_var.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

nan.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

null.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

optional.zig

aarch64: implement optional comparisons

2025-10-30 09:31:30 +00:00

packed_struct_explicit_backing_int.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

packed-struct.zig

disable failing stage2_aarch64 behavior tests

2025-09-20 18:33:01 -07:00

packed-union.zig

behavior tests: update for new requirement

2025-09-05 19:44:54 -07:00

pointers.zig

add behavior test: comptime C pointer to optional pointer

2025-09-20 18:58:32 -07:00

popcount.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

prefetch.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

ptrcast.zig

Sema: exclude sentinel from source array length in pointer cast to slice

2025-07-26 14:54:04 +01:00

ptrfromint.zig

test: skip tests that were not meant to pass for spirv

2025-08-09 13:27:45 +03:30

pub_enum.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

ref_var_in_if_after_if_2nd_switch_prong.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

reflection.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

return_address.zig

aarch64: implement some safety checks

2025-07-26 17:31:04 -04:00

saturating_arithmetic.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

select.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

shuffle.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

sizeof_and_typeof.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

slice_sentinel_comptime.zig

spirv: update tests

2024-02-04 19:09:33 +01:00

slice.zig

Dwarf: implement pointers to more comptime values

2026-01-05 11:24:48 +01:00

src.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

string_literals.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

struct_contains_null_ptr_itself.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

struct_contains_slice_of_itself.zig

aarch64: workaround some optional/union issues

2025-07-28 09:03:17 -07:00

struct.zig

Dwarf: implement pointers to more comptime values

2026-01-05 11:24:48 +01:00

switch_loop.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

switch_on_captured_error.zig

aarch64: fix behavior failures

2025-09-20 18:33:01 -07:00

switch_prong_err_enum.zig

aarch64: workaround some optional/union issues

2025-07-28 09:03:17 -07:00

switch_prong_implicit_cast.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

switch.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

this.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

threadlocal.zig

represent Mac Catalyst as aarch64-maccatalyst-none rather than aarch64-ios-macabi

2025-11-14 11:33:35 +01:00

truncate.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

try.zig

aarch64: fix behavior failures

2025-09-20 18:33:01 -07:00

tuple_declarations.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

tuple.zig

all: replace all @Type usages

2025-11-22 22:42:38 +00:00

type_info.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

type.zig

Sema: initialize OPV comptime allocs correctly

2025-11-29 11:55:36 +00:00

typename.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

undefined.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

underscore.zig

riscv: std.fmt.format running

2024-06-13 02:20:47 -07:00

union.zig

stage2_wasm: revival, enabling tests

2025-12-07 07:21:15 +01:00

var_args.zig

represent Mac Catalyst as aarch64-maccatalyst-none rather than aarch64-ios-macabi

2025-11-14 11:33:35 +01:00

vector.zig

stage2_wasm: revival, enabling tests

2025-12-07 07:21:15 +01:00

void.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

wasm.zig

riscv: add stage2_riscv to test matrix and bypass failing tests

2024-05-11 02:17:24 -07:00

while.zig

aarch64: fix error union constants

2025-07-27 08:01:07 -04:00

widening.zig

aarch64: add new from scratch self-hosted backend

2025-07-22 19:43:47 -07:00

wrapping_arithmetic.zig

rename spirv backend name

2025-06-16 13:22:19 +03:30

x86_64.zig

x86_64: increase passing test coverage on windows

2025-06-19 18:41:12 -04:00

zero.bin

Module: fix @embedFile of files containing zero bytes

2024-02-22 12:33:53 -08:00

zon.zig

compiler: allow @import of ZON without a result type

2025-04-02 05:53:22 +01:00