[PATCH] D57359: [GlobalISel] Introduce a G_FSQRT generic instruction

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


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Comment at: include/llvm/Target/GenericOpcodes.td:572-577
+// Floating point square root of a value.
+def G_FSQRT : GenericInstruction {
+  let OutOperandList = (outs type0:$dst);
+  let InOperandList = (ins type0:$src1);
+  let hasSideEffects = 0;
+}
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arsenm wrote:
> Needs a comment about the < 0 behavior. One particularly awful detail of SelectionDAG is ISD::FSQRT 's behavior differs from the llvm.sqrt intrinsic.
To be more specific, the IR claims this is undefined, which is the wrong answer. This should return a NAN


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57359/new/

https://reviews.llvm.org/D57359