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This is one more follow-up to PR
https://github.com/llvm/llvm-project/pull/157517 that cleans up the
usage of
libc_errno in math unit-tests (non-smoke). It follows the same rule:
* if you use libc_errno in code literally, include
src/__support/libc_errno.h
* if you only rely on errno constants, include hdr/errno_macros.h
Several tests for exp/log still retain the direct libc_errno usage,
since in some cases they skip doing any validation if the error was
raised. But the direct usage of libc_errno is removed from all other
cases.
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<stdint.h> includes. (#150303)
https://github.com/llvm/llvm-project/issues/149993
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LIBC_ERRNO_MODE_SYSTEM to be header-only. (#143187)
This is the first step in preparation for:
https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450
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Fix #98393
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Context: https://github.com/llvm/llvm-project/pull/87017
- Add proxy header `libc/hdr/math_macros.h` that will:
- include `<math.h>` in overlay mode,
- include `"include/llvm-libc-macros/math-macros.h"` in full build mode.
- Its corresponding CMake target `libc.hdr.math_macros` will only depend
on `libc.include.math` and `libc.include.llvm-libc-macros.math_macros`
in full build mode.
- Replace all `#include "include/llvm-libc-macros/math-macros.h"` with
`#include "hdr/math_macros.h"`.
- Add dependency to `libc.hdr.math_macros` CMake target when using
`add_fp_unittest`.
- Update the remaining dependency.
- Update bazel overlay: add `libc:hdr_math_macros` target, and replacing
all dependency on `libc:llvm_libc_macros_math_macros` with
`libc:hdr_math_macros`.
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Reland of #84991
A downstream overlay mode user ran into issues with the isnan macro not
working in our sources with a specific libc configuration. This patch
replaces the last direct includes of math.h with our internal
math_macros.h, along with the necessary build system changes.
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Having libc_errno outside of the namespace causes versioning issues when
trying to link the tests against LLVM-libc. Most of this patch is just
moving libc_errno inside the namespace in tests. This isn't necessary in
the function implementations since those are already inside the
namespace.
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The semantics for casting can range from "bitcast" (same representation)
to "different representation", to "type promotion". Here we remove the
cast operator and force usage of `get_val` as the only function to get
the floating point value, making the intent clearer and more consistent.
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(#69558)
Clean up usage of `DECLARE_SPECIAL_CONSTANTS` in global scope.
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This is step 4 of
https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079
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Re-order exceptional branches and slightly adjust the evaluation.
Performance tested with the CORE-MATH project on AMD EPYC 7B12 (clocks/op)
Reciprocal throughputs:
```
--- BEFORE ---
$ CORE_MATH_PERF_MODE=rdtsc ./perf.sh tanhf
[####################] 100 % (with -mavx2 -mfma)
Ntrial = 20 ; Min = 7.794 + 0.102 clc/call; Median-Min = 0.066 clc/call; Max = 8.267 clc/call;
[####################] 100 %. (with -msse4.2)
Ntrial = 20 ; Min = 10.783 + 0.172 clc/call; Median-Min = 0.144 clc/call; Max = 11.446 clc/call;
[####################] 100 %. (SSE2)
Ntrial = 20 ; Min = 18.926 + 0.381 clc/call; Median-Min = 0.342 clc/call; Max = 19.623 clc/call;
--- AFTER ---
$ CORE_MATH_PERF_MODE=rdtsc ./perf.sh tanhf
[####################] 100 % (with -mavx2 -mfma)
Ntrial = 20 ; Min = 6.598 + 0.085 clc/call; Median-Min = 0.052 clc/call; Max = 6.868 clc/call;
[####################] 100 % (with -msse4.2)
Ntrial = 20 ; Min = 9.245 + 0.304 clc/call; Median-Min = 0.248 clc/call; Max = 10.675 clc/call;
[####################] 100 %. (SSE2)
Ntrial = 20 ; Min = 11.724 + 0.440 clc/call; Median-Min = 0.444 clc/call; Max = 12.262 clc/call;
```
Latency:
```
--- BEFORE ---
$ PERF_ARGS="--latency" CORE_MATH_PERF_MODE=rdtsc ./perf.sh tanhf
[####################] 100 % (with -mavx2 -mfma)
Ntrial = 20 ; Min = 38.821 + 0.157 clc/call; Median-Min = 0.122 clc/call; Max = 39.539 clc/call;
[####################] 100 %. (with -msse4.2)
Ntrial = 20 ; Min = 44.767 + 0.766 clc/call; Median-Min = 0.681 clc/call; Max = 45.951 clc/call;
[####################] 100 %. (SSE2)
Ntrial = 20 ; Min = 55.055 + 1.512 clc/call; Median-Min = 1.571 clc/call; Max = 57.039 clc/call;
--- AFTER ---
$ PERF_ARGS="--latency" CORE_MATH_PERF_MODE=rdtsc ./perf.sh tanhf
[####################] 100 % (with -mavx2 -mfma)
Ntrial = 20 ; Min = 36.147 + 0.194 clc/call; Median-Min = 0.181 clc/call; Max = 36.536 clc/call;
[####################] 100 % (with -msse4.2)
Ntrial = 20 ; Min = 40.904 + 0.728 clc/call; Median-Min = 0.557 clc/call; Max = 42.231 clc/call;
[####################] 100 %. (SSE2)
Ntrial = 20 ; Min = 55.776 + 0.557 clc/call; Median-Min = 0.542 clc/call; Max = 56.551 clc/call;
```
Reviewed By: michaelrj
Differential Revision: https://reviews.llvm.org/D153026
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Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D151798
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floating point exceptions.
Switch math functions to use libc_errno and fix some errno and
floating point exceptions
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D145349
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This part of the effort to make all test related pieces into the `test`
directory. This helps is excluding test related pieces in a straight
forward manner if LLVM_INCLUDE_TESTS is OFF. Future patches will also move
the MPFR wrapper and testutils into the 'test' directory.
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Correct rounding function. Performance ~2x faster than glibc analog.
Performance (llvm 12 intel):
```
CORE_MATH_PERF_MODE=rdtsc PERF_ARGS='' ./perf.sh tanhf
GNU libc version: 2.31
GNU libc release: stable
13.279
37.492
18.145
CORE_MATH_PERF_MODE=rdtsc PERF_ARGS='--latency' ./perf.sh tanhf
GNU libc version: 2.31
GNU libc release: stable
40.658
109.582
66.568
```
Differential Revision: https://reviews.llvm.org/D130780
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