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LLVM backend for 6502
9215b9ab25
When adding little-endian vector support for PowerPC last year, I inadvertently disabled an optimization that recognizes a load-splat idiom and generates the lxvdsx instruction. This patch moves the offending logic so lxvdsx is once again generated. This pattern is frequently generated by the vectorizer for scalar loads of an effective constant. Previously the lxvdsx instruction was wrongly listed as lane-sensitive for the VSX swap optimization (since both doublewords are identical, swaps are safe). This patch fixes this as well, so that vectorized code using lxvdsx can now have swaps removed from the computation. There is an existing test (@test50) in test/CodeGen/PowerPC/vsx.ll that checks for the missing optimization. However, vsx.ll was only being tested for POWER7 with big-endian code generation. I've added a little-endian RUN statement and expected LE code generation for all the tests in vsx.ll to give us a bit better VSX coverage, including what's needed for this patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241183 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| README.txt | ||
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