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| author | Craig Topper <craig.topper@intel.com> | 2018-06-14 19:28:31 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2018-06-14 19:28:31 +0000 |
| commit | bfa94d508686c14268d7ce2b2bd094336a7ddf4a (patch) | |
| tree | ceb0109709d3499c76f7a49faa717b9f246e0526 /llvm/lib/Target/X86 | |
| parent | a92847359a33bb9b63839d3ba0afa88d057bff1f (diff) | |
| download | bcm5719-llvm-bfa94d508686c14268d7ce2b2bd094336a7ddf4a.tar.gz bcm5719-llvm-bfa94d508686c14268d7ce2b2bd094336a7ddf4a.zip | |
[X86] Fix stale comment in folding tables.
llvm-svn: 334758
Diffstat (limited to 'llvm/lib/Target/X86')
| -rw-r--r-- | llvm/lib/Target/X86/X86InstrInfo.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp index bd56e511a3e..d92a99a6e67 100644 --- a/llvm/lib/Target/X86/X86InstrInfo.cpp +++ b/llvm/lib/Target/X86/X86InstrInfo.cpp @@ -805,9 +805,9 @@ X86InstrInfo::X86InstrInfo(X86Subtarget &STI) // VBROADCASTS{SD}rr register instructions were an AVX2 addition while the // VBROADCASTS{SD}rm memory instructions were available from AVX1. - // TB_NO_REVERSE prevents unfolding from introducing an illegal instruction - // on AVX1 targets. The VPBROADCAST instructions are all AVX2 instructions - // so they don't need an equivalent limitation. + // TB_NO_REVERSE prevents unfolding because doing so would create a full + // vector load while the broadcast load would have only been a single + // element. { X86::VBROADCASTSSrr, X86::VBROADCASTSSrm, TB_NO_REVERSE }, { X86::VBROADCASTSSYrr, X86::VBROADCASTSSYrm, TB_NO_REVERSE }, { X86::VBROADCASTSDYrr, X86::VBROADCASTSDYrm, TB_NO_REVERSE }, |
