[llvm] [AMDGPU] Update log lowering to remove contract for AMDGCN backend (PR #168916)

[Adel Ejjeh via llvm-commits]

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@@ -2767,7 +2766,9 @@ SDValue AMDGPUTargetLowering::LowerFLOGCommon(SDValue Op,
   EVT VT = Op.getValueType();
   SDNodeFlags Flags = Op->getFlags();
   SDLoc DL(Op);
-
+  // Our implementation of LOG is not contract safe, so disable instruction
+  // contraction.
+  Flags.setAllowContract(false);
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adelejjeh wrote:

Do you mean remove the flag from the actual MIR instructions that we generate for llvm.log where the flag is problematic, instead of removing it from llvm.log itself?

https://github.com/llvm/llvm-project/pull/168916