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| author | Zahira Ammarguellat <zahira.ammarguellat@intel.com> | 2023-01-25 17:11:07 -0500 |
|---|---|---|
| committer | Zahira Ammarguellat <zahira.ammarguellat@intel.com> | 2023-01-26 14:18:28 -0500 |
| commit | b4b06d8ff82647824a658356e1e8f7dc9d1ac7d2 (patch) | |
| tree | 4622b38d2fdcba790ee748a7a36bd9ed512a786e /llvm/unittests/Support/MathExtrasTest.cpp | |
| parent | 42e371b174d4407ec5805010c2ecfef9c086b5c2 (diff) | |
| download | llvm-b4b06d8ff82647824a658356e1e8f7dc9d1ac7d2.zip llvm-b4b06d8ff82647824a658356e1e8f7dc9d1ac7d2.tar.gz llvm-b4b06d8ff82647824a658356e1e8f7dc9d1ac7d2.tar.bz2 | |
__arithmetic_fence enforces ordering on expression evaluation when fast-math
is enabled.
In fast math mode some floating-point optimizations are performed such as
reassociation and distribution.
For example, the compiler may transform (a+b)+c into a+(b+c). Although these
two expressions are equivalent in integer arithmetic, they may not be in
floating-point arithmetic. The builtin tells the compiler that the expression
in parenthesis can’t be re-associated or distributed.
__arithmetic_fence(a+b)+c is not equivalent to a+(b+c).
This patch adds the support of the builtin to SPIR target.
Differential Revision: https://reviews.llvm.org/D142583
Diffstat (limited to 'llvm/unittests/Support/MathExtrasTest.cpp')
0 files changed, 0 insertions, 0 deletions