[llvm-dev] RFC: [X86] Can we begin removing AutoUpgrade support for x86 instrinsics added in early 3.X versions
Craig Topper via llvm-dev
llvm-dev at lists.llvm.org
Wed Sep 20 12:20:00 PDT 2017
We have quite a lot of code in AutoUpgrade.cpp to upgrade X86 intrinsics
that have been replaced with native IR over the years. Has enough time
and/or versions passed that we can begin phasing out some of this code?
As I'm writing these we don't seem to have tests for a lot of the older
upgrades. We've done better at this in the last few years.
3.1 added upgrade for:
x86.sse2.pcmpeq.* - we have almost no test cases for this
x86.sse2.pcmpgt.* - we no test cases for this
x86.avx2.pcmpeq.* - we have no test cases
x86.avx2.pcmpgt.* - we have no test cases for this
x86.avx.vpermil.* - we do test this
3.2 added upgrade for:
x86.avx.movnt.* - we have tests for this
x86.xop.vpcom* - we have tests for this
x86.sse41.ptest.* had its signature chagned and we upgrade from the old
signature. We don't have tests for the old signature.
x86.xop.vfrcz.ss/sd had an argument dropped that we upgrade for. We don't
have any tests for the old signature.
3.3 had no upgrades
x86.sse42.crc32.64.8 we do have tests that use it
For the complete list of intrinsic upgrade support, there's an annotated
list in ShouldUpgradeX86Intrinsic in AutoUpgrade.cpp
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