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Diffstat (limited to 'llvm/docs/ReleaseNotes.rst')
| -rw-r--r-- | llvm/docs/ReleaseNotes.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst index eb340235f5f..1d501b26063 100644 --- a/llvm/docs/ReleaseNotes.rst +++ b/llvm/docs/ReleaseNotes.rst @@ -96,6 +96,10 @@ Changes to the X86 Target be passed in ZMM registers for calls and returns. Previously they were passed in two YMM registers. Old behavior can be enabled by passing -x86-enable-old-knl-abi +* -mprefer-vector-width=256 is now the default behavior skylake-avx512 and later + Intel CPUs. This tries to limit the use of 512-bit registers which can cause a + decrease in CPU frequency on these CPUs. This can be re-enabled by passing + -mprefer-vector-width=512 to clang or passing -mattr=-prefer-256-bit to llc. Changes to the AMDGPU Target ----------------------------- |
