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348e9e7b6d
Peephole optimization was folding MOVSDrm, which is a zero-extending double precision floating point load, into ADDPDrr, which is a SIMD add of two packed double precision floating point values. (before) %vreg21<def> = MOVSDrm <fi#0>, 1, %noreg, 0, %noreg; mem:LD8[%7](align=16)(tbaa=<badref>) VR128:%vreg21 %vreg23<def,tied1> = ADDPDrr %vreg20<tied0>, %vreg21; VR128:%vreg23,%vreg20,%vreg21 (after) %vreg23<def,tied1> = ADDPDrm %vreg20<tied0>, <fi#0>, 1, %noreg, 0, %noreg; mem:LD8[%7](align=16)(tbaa=<badref>) VR128:%vreg23,%vreg20 X86InstrInfo::foldMemoryOperandImpl already had the logic that prevented this from happening. However the check wasn't being conducted for loads from stack objects. This commit factors out the logic into a new function and uses it for checking loads from stack slots are not zero-extending loads. rdar://problem/18236850 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217799 91177308-0d34-0410-b5e6-96231b3b80d8
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