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[libc][math][c++23] Add {nearbyint,rint,lrint,llrint,lround,llround}bf16 math functions #153882

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Merged
merged 14 commits into from
Aug 24, 2025
Merged

[libc][math][c++23] Add {nearbyint,rint,lrint,llrint,lround,llround}bf16 math functions #153882

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6ca3fcf
feat: implement {nearbyint,rint,lrint,llrint,lround,llround}bf16 func…
krishna2803 Aug 15, 2025
1e49139
chore: update CMakeLists.txt
krishna2803 Aug 15, 2025
5aa423e
chore: add smoke tests for {nearbyint,rint,lrint,llrint,lround,llroun…
krishna2803 Aug 15, 2025
292ce86
feat: add static_cast<T> support for integer Ts from bfloat16
krishna2803 Aug 15, 2025
8669fd8
chore: update entrypoints
krishna2803 Aug 15, 2025
69418ef
chore: add general tests for {nearbyint,rint,lrint,llrint,lround,llro…
krishna2803 Aug 15, 2025
70e7744
chore: update MPFRUtils and tests for bfloat16 rounding
krishna2803 Aug 15, 2025
f551fe9
merge: branch 'main' into bf16-rounding
krishna2803 Aug 15, 2025
a59c06c
docs: add {nearbyint,rint,lrint,llrint,lround,llround}bf16 functions
krishna2803 Aug 15, 2025
35d7626
style: clang-format
krishna2803 Aug 15, 2025
ab1bbde
docs: fix incorrect check
krishna2803 Aug 15, 2025
3bca59b
fix: typo std -> cpp
krishna2803 Aug 15, 2025
a731166
docs: add spacing
krishna2803 Aug 15, 2025
47e8b5d
Merge branch 'main' into bf16-rounding
krishna2803 Aug 24, 2025
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6 changes: 6 additions & 0 deletions libc/config/baremetal/aarch64/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -785,16 +785,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/baremetal/arm/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -788,16 +788,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/baremetal/riscv/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -788,16 +788,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/darwin/aarch64/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -618,16 +618,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/darwin/x86_64/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -261,16 +261,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/gpu/amdgpu/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -644,16 +644,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/gpu/nvptx/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -646,16 +646,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/linux/aarch64/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -873,16 +873,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/linux/arm/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -488,16 +488,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
Expand Down
6 changes: 6 additions & 0 deletions libc/config/linux/riscv/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -891,16 +891,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/linux/x86_64/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -924,16 +924,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
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6 changes: 6 additions & 0 deletions libc/config/windows/entrypoints.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -334,16 +334,22 @@ list(APPEND TARGET_LIBM_ENTRYPOINTS
libc.src.math.fminimum_magbf16
libc.src.math.fminimum_mag_numbf16
libc.src.math.fminimum_numbf16
libc.src.math.llrintbf16
libc.src.math.llroundbf16
libc.src.math.lrintbf16
libc.src.math.lroundbf16
libc.src.math.fromfpbf16
libc.src.math.fromfpxbf16
libc.src.math.getpayloadbf16
libc.src.math.nanbf16
libc.src.math.nearbyintbf16
libc.src.math.nextafterbf16
libc.src.math.nextdownbf16
libc.src.math.nexttowardbf16
libc.src.math.nextupbf16
libc.src.math.roundbf16
libc.src.math.roundevenbf16
libc.src.math.rintbf16
libc.src.math.setpayloadbf16
libc.src.math.setpayloadsigbf16
libc.src.math.truncbf16
Expand Down
12 changes: 6 additions & 6 deletions libc/docs/headers/math/index.rst
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Expand Up @@ -199,21 +199,21 @@ Basic Operations
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| llogb | |check| | |check| | |check| | |check| | |check| | | 7.12.6.10 | F.10.3.10 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| llrint | |check| | |check| | |check| | |check| | |check| | | 7.12.9.5 | F.10.6.5 |
| llrint | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.9.5 | F.10.6.5 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| llround | |check| | |check| | |check| | |check| | |check| | | 7.12.9.7 | F.10.6.7 |
| llround | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.9.7 | F.10.6.7 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| logb | |check| | |check| | |check| | |check| | |check| | | 7.12.6.17 | F.10.3.17 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| lrint | |check| | |check| | |check| | |check| | |check| | | 7.12.9.5 | F.10.6.5 |
| lrint | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.9.5 | F.10.6.5 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| lround | |check| | |check| | |check| | |check| | |check| | | 7.12.9.7 | F.10.6.7 |
| lround | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.9.7 | F.10.6.7 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| modf | |check| | |check| | |check| | |check| | |check| | | 7.12.6.18 | F.10.3.18 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| nan | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.11.2 | F.10.8.2 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| nearbyint | |check| | |check| | |check| | |check| | |check| | | 7.12.9.3 | F.10.6.3 |
| nearbyint | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.9.3 | F.10.6.3 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| nextafter | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.11.3 | F.10.8.3 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
Expand All @@ -227,7 +227,7 @@ Basic Operations
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| remquo | |check| | |check| | |check| | |check| | |check| | | 7.12.10.3 | F.10.7.3 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| rint | |check| | |check| | |check| | |check| | |check| | | 7.12.9.4 | F.10.6.4 |
| rint | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.9.4 | F.10.6.4 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
| round | |check| | |check| | |check| | |check| | |check| | |check| | 7.12.9.6 | F.10.6.6 |
+------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
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5 changes: 5 additions & 0 deletions libc/src/__support/FPUtil/bfloat16.h
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,11 @@ struct BFloat16 {
return cpp::bit_cast<float>(x_bits);
}

template <typename T, cpp::enable_if_t<cpp::is_integral_v<T>, int> = 0>
LIBC_INLINE constexpr explicit operator T() const {
return static_cast<T>(static_cast<float>(*this));
}

LIBC_INLINE bool operator==(BFloat16 other) const {
return fputil::equals(*this, other);
}
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6 changes: 6 additions & 0 deletions libc/src/math/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -392,24 +392,28 @@ add_math_entrypoint_object(llrintf)
add_math_entrypoint_object(llrintl)
add_math_entrypoint_object(llrintf16)
add_math_entrypoint_object(llrintf128)
add_math_entrypoint_object(llrintbf16)

add_math_entrypoint_object(llround)
add_math_entrypoint_object(llroundf)
add_math_entrypoint_object(llroundl)
add_math_entrypoint_object(llroundf16)
add_math_entrypoint_object(llroundf128)
add_math_entrypoint_object(llroundbf16)

add_math_entrypoint_object(lrint)
add_math_entrypoint_object(lrintf)
add_math_entrypoint_object(lrintl)
add_math_entrypoint_object(lrintf16)
add_math_entrypoint_object(lrintf128)
add_math_entrypoint_object(lrintbf16)

add_math_entrypoint_object(lround)
add_math_entrypoint_object(lroundf)
add_math_entrypoint_object(lroundl)
add_math_entrypoint_object(lroundf16)
add_math_entrypoint_object(lroundf128)
add_math_entrypoint_object(lroundbf16)

add_math_entrypoint_object(modf)
add_math_entrypoint_object(modff)
Expand All @@ -429,6 +433,7 @@ add_math_entrypoint_object(nearbyintf)
add_math_entrypoint_object(nearbyintl)
add_math_entrypoint_object(nearbyintf16)
add_math_entrypoint_object(nearbyintf128)
add_math_entrypoint_object(nearbyintbf16)

add_math_entrypoint_object(nextafter)
add_math_entrypoint_object(nextafterf)
Expand Down Expand Up @@ -479,6 +484,7 @@ add_math_entrypoint_object(rintf)
add_math_entrypoint_object(rintl)
add_math_entrypoint_object(rintf16)
add_math_entrypoint_object(rintf128)
add_math_entrypoint_object(rintbf16)

add_math_entrypoint_object(round)
add_math_entrypoint_object(roundf)
Expand Down
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