[PATCH] D104245: [GlobalISel] Describe undefined values for G_SBFX/G_UBFX operands

Brendon Cahoon via Phabricator via llvm-commits llvm-commits at lists.llvm.org
Fri Jun 18 14:59:24 PDT 2021


bcahoon added inline comments.


================
Comment at: llvm/docs/GlobalISel/GenericOpcode.rst:259
+
+      0 <= lsb < lsb + width <= source bitwidth, where all values are unsigned
+
----------------
arsenm wrote:
> What what is the result if this is violated? Poison?
I think poison makes sense. Though, I'm not sure how that concept occurs in the gMIR?


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