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llvm-project/libc/src
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Tue Ly 628fbbef81 [libc] Use nearest_integer instructions to improve expm1f performance. 
Use nearest_integer instructions to improve expf performance.

Performance tests with CORE-MATH's perf tool:

Before the patch:
```
$ ./perf.sh expm1f
LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.31
GNU libc release: stable
CORE-MATH reciprocal throughput   : 10.096
System LIBC reciprocal throughput : 44.036
LIBC reciprocal throughput        : 11.575

$ ./perf.sh expm1f --latency
LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.31
GNU libc release: stable
CORE-MATH latency   : 42.239
System LIBC latency : 122.815
LIBC latency        : 50.122
```
After the patch:
```
$ ./perf.sh expm1f
LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.31
GNU libc release: stable
CORE-MATH reciprocal throughput   : 10.046
System LIBC reciprocal throughput : 43.899
LIBC reciprocal throughput        : 9.179

$ ./perf.sh expm1f --latency
LIBC-location: /home/lnt/experiment/llvm/llvm-project/build/projects/libc/lib/libllvmlibc.a
GNU libc version: 2.31
GNU libc release: stable
CORE-MATH latency   : 42.078
System LIBC latency : 120.488
LIBC latency        : 41.528
```

Reviewed By: zimmermann6

Differential Revision: https://reviews.llvm.org/D130502
2022-07-26 09:12:37 -04:00
..
__support
[libc] Add dirent.h functions opendir, readdir, closedir and dirfd.
2022-07-25 20:23:25 +00:00
assert
[libc][NFC] Remove all Linux specific code to respective linux/ directories
2022-02-08 18:32:18 +00:00
ctype
[libc][NFC] Add explicit casts to ctype functions
2021-08-23 18:17:20 +00:00
dirent
[libc] Add dirent.h functions opendir, readdir, closedir and dirfd.
2022-07-25 20:23:25 +00:00
errno
[libc] Make the errno macro resolve to the thread local variable directly.
2022-03-04 17:29:49 +00:00
fcntl
[libc] Make the errno macro resolve to the thread local variable directly.
2022-03-04 17:29:49 +00:00
fenv
[libc][NFC] Make explicit uint16_t casts in fenv
2022-06-16 16:18:44 +00:00
inttypes
[libc] Add imaxabs
2022-07-11 21:28:21 +00:00
math
[libc] Use nearest_integer instructions to improve expm1f performance.
2022-07-26 09:12:37 -04:00
pthread
[libc] Add implementations of pthread_equal and pthread_self.
2022-07-14 20:12:35 +00:00
signal
[libc] Make the errno macro resolve to the thread local variable directly.
2022-03-04 17:29:49 +00:00
stdio
[libc][nfc] move printf inf/nan to separate function
2022-07-22 10:29:35 -07:00
stdlib
[libc] Don't call user comparator function for equal pointers
2022-07-22 17:03:16 +00:00
string
[libc] Fix missing static_cast
2022-06-28 09:50:54 +00:00
sys
[libc] Make the errno macro resolve to the thread local variable directly.
2022-03-04 17:29:49 +00:00
threads
[libc] Add implementations of pthread_equal and pthread_self.
2022-07-14 20:12:35 +00:00
time
[libc] Make the errno macro resolve to the thread local variable directly.
2022-03-04 17:29:49 +00:00
unistd
[libc] Add implementation of POSIX lseek function.
2022-03-15 16:24:48 +00:00
.clang-tidy
[libc] Add a .clang-tidy file for the toplevel libc directory.
2021-12-09 00:19:25 +00:00
CMakeLists.txt
[libc] Add dirent.h functions opendir, readdir, closedir and dirfd.
2022-07-25 20:23:25 +00:00