forked from OSchip/llvm-project
84e22b9096
The function 'getTargetShuffleMask' already knows how to deal with PSHUFB nodes where the mask node is a load from constant pool, and the constant pool node is wrapped by a X86ISD::Wrapper node. This patch extends that logic by teaching it how to also look through X86ISD::WrapperRIP. This helps function combineX86ShufflesRecusively to combine more shuffle sequences containing PSHUFB nodes if we are in RIPRel PIC mode. Before this change, llc (with -relocation-model=pic -march=x86-64) was unable to decode a pshufb where the mask was loaded from a constant pool. For example, the no-op shuffle from test 'x86-fold-pshufb.ll' was not folded into its operand, so instead of generating a single 'movaps' the backend always generated a sub-optimal 'movdqa + pshufb' sequence. Added test x86-fold-pshufb.ll. llvm-svn: 236863 |
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| clang | ||
| clang-tools-extra | ||
| compiler-rt | ||
| debuginfo-tests | ||
| libclc | ||
| libcxx | ||
| libcxxabi | ||
| libunwind | ||
| lld | ||
| lldb | ||
| llgo | ||
| llvm | ||
| openmp | ||
| polly | ||