Implement double precision log10 function correctly rounded for all
rounding modes. This implementation currently needs FMA instructions for
correctness.
Use 2 passes:
Fast pass:
- 1 step range reduction with a lookup table of `2^7 = 128` elements to reduce the ranges to `[-2^-7, 2^-7]`.
- Use a degree-7 minimax polynomial generated by Sollya, evaluated using a mixed of double-double and double precisions.
- Apply Ziv's test for accuracy.
Accurate pass:
- Apply 5 more range reduction steps to reduce the ranges further to [-2^-27, 2^-27].
- Use a degree-4 minimax polynomial generated by Sollya, evaluated using 192-bit precisions.
- By the result of Lefevre (add quote), this is more than enough for correct rounding to all rounding modes.
In progress: Adding detail documentations about the algorithm.
Depend on: https://reviews.llvm.org/D136799
Reviewed By: zimmermann6
Differential Revision: https://reviews.llvm.org/D139846
To improve code generation for C++ code that directly includes our
headers, the external function definitions will now be marked noexcept.
This may not be necessary for the internal definitions since we build
with the -fno-exceptions flag.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D141095
one of the tests in StrtolTest.h is intended to detect that 32 bit longs
are handled correctly, but it wasn't using the correct value for errno
causing failures.
Differential Revision: https://reviews.llvm.org/D140577
Few uses of free have not yet been replaced by the custom operator
delete yet. They will be done in a follow up patch.
Reviewed By: lntue, michaelrj
Differential Revision: https://reviews.llvm.org/D140526
Previously the tests were copy/pasted into several files, this changes
them to be instead templated and sharing one file.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D140441
Add support for the %e/E conversion in printf, as well as unit tests. It
does not yet support long doubles.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D140042
This can be easily resurrected if required in future. It calls malloc
directly. So, instead of updating an unused piece to the newer pattern
of using the custom operator new, this patch just deletes it.
The config currently includes ctype, math, stdlib, inttypes and string
functions.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D140378
The standard describes atoi as:
"equivalent to atoi: (int)strtol(nptr, (char **)NULL, 10)"
Previously, our behavior was slightly different on numbers larger than
INT_MAX, but this patch changes it to just do the cast instead. Both of
these are valid since the standard says
"If the value of the result cannot be represented, the
behavior is undefined."
But matching existing behavior makes differential fuzzing easier.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D140350
The internal uint class had a bug introduced recently when optimizing
the shift routines. When calculating the value of a block, it would
shift an adjacent block by 64 - the shift amount. If the shift amount
was 0, this would be a shift of 64, which is undefined for a 64 bit
integer. This patch fixes this by adding a conditional to catch this
case.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D140070
Implement a high-precision floating point class using UInt<> as its
mantissa. This will be used in accurate pass for double precision math
functions.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D136799
This patch adds the integer conversions %d/i/u/o/x/X to scanf as well as
unit tests to check their correctness.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D138880
This is a first step to support GCC. This patch adds support for builtin and feature detection.
Differential Revision: https://reviews.llvm.org/D139712
There were some tests added that attempted to access files after they
were closed to test errno behavior, this caused sanitizer issues. Those
portions of the tests have been disabled.
Differential Revision: https://reviews.llvm.org/D139878
The `tools` directory depends on `llvm_gtest` which is not immediately
availible with a runtimes build. This patch builds the `llvm_gtest`
target if it isn't present. Additionally, we use the CMake binary
directory to find the tool binary, which is different when using a
runtimes build. Using the LLVM binary directory should match both build
conditions.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D139348
This patch adds the implementation of the custom operator new functions.
The implementation of the internal strdup has been updated to use
operator new for allocation.
We will make it a policy and document that all allocations have to go
through the libc's own operator new. A future change will also add
operator delete replacements and make it a policy that deallocations in
libc internal code have to go through those replacements.
Reviewed By: lntue
Differential Revision: https://reviews.llvm.org/D139584
Implement full multiplication `UInt<A> * UInt<B> -> UInt<A + B>` and
`quick_mul_hi` that returns the higher half of the product `UInt<A> * UInt<A>`.
These 2 functions will be used for dyadic floating point class.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D138541
Summary:
A previous change removed a transient inclusion of `stdlib.h` from the
`string_utils.h` file which this test depended on. Include it directly
here.
This patch adds scanf, sscanf, and fscanf entrypoints. It also adds unit
tests for sscanf and a basic test to fscanf. The scanf function is
basically impossible to test in an automated fashion due to it recieving
user input.
Reviewed By: sivachandra, lntue
Differential Revision: https://reviews.llvm.org/D138076
The mprotect test has been failing and causing significant buildbot
noise. Given that this is a simple functions it's more important that
the buildbot errors be useful than having more thorough tests for this
function.
Reviewed By: sivachandra, lntue
Differential Revision: https://reviews.llvm.org/D138061
+ Deleted duplicate definitions of StructTimeVal and StructTimeValPtr.
+ Caled syscall clock_gettime to get timespec data.
+ Added tests to test for sleeping 200 and 1000 microseconds.
+ Fixed comments from https://reviews.llvm.org/D137881
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D138064
The assert functions were disabled while the signal functions were being
fixed. This patch re-enables them.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D138056
Implement gettimeofday per
.../onlinepubs/9699919799/functions/gettimeofday.html.
This call clock_gettime to implement gettimeofday function.
Tested:
Limited unit test: This makes a call and checks that no error was
returned. Used nanosleep for 100 microseconds and verfified it
returns a value that elapses more than 100 microseconds and less
than 300 microseconds.
Co-authored-by: Jeff Bailey <jeffbailey@google.com>
Differential Revision: https://reviews.llvm.org/D137881
In the code
const char *str = "abc"
if you do sizeof(str) you get the size of the pointer, not the string.
This patch fixes that mistake.
Differential Revision: https://reviews.llvm.org/D137586
This patch adds the basic conversion facilities to scanf as well as unit
tests for them. It also adds scanf_main which will be used for the
eventual scanf entrypoints.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D137376
This is the interface that will be used to read from a file or string in
scanf. This patch also adds the string and file implementations of the
reader, although the file reader is not yet complete since ungetc has
not yet been implemented.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D137117
Previously, the printf parser would treat "%\0" as a conversion with the
name "\0", and advance past the null byte causing a buffer overflow.
This patch corrects that in both printf and scanf.
Reviewed By: sivachandra
Differential Revision: https://reviews.llvm.org/D137367
A bug in the file read logic has also been fixed along the way. Parts
of the ungetc tests will fail without that bug fixed.
Reviewed By: michaelrj
Differential Revision: https://reviews.llvm.org/D137286
This patch extracts the testing logic from `op_tests.cpp` into
`memory_check_utils.h` so we can reuse it for mem* function integration
tests.
This makes testing consistent and thorough.
For instance this catches a bug that got unnoticed during submission of
D136595 and D135134. Integration test for memcmp was only testing a
single size.
This also leverages ASAN to make sure that data is not read / written
outside permitted boundaries
Differential Revision: https://reviews.llvm.org/D136865
