[PATCH] D140975: Support critical edge splitting for jump tables

[Craig Topper via Phabricator via llvm-commits]

craig.topper added inline comments.


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Comment at: llvm/lib/Target/X86/X86InstrInfo.cpp:3242
+  //   %1 = MOVSX64rm32 %0, 4, XX, 0, $noreg
+  //   %2 = ADD64rr %1, %0
+  //   JMP64r %2
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I'm not sure I understand this code. The MOVSXrm32 is loading from %0, sign extending it, and then adds what it loaded also to %0?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D140975/new/

https://reviews.llvm.org/D140975