spavloff wrote: Hi @dyung.
The observed difference is due to the FP contraction turned off if optnone is specified. In O0 this optimization is still applied. As a result, the function with optnone contains separate fadd and fmul, while without this attribute the function contains combined operatin fmuladd. This optimization is turned off in `FPOption.setDisallowOptimizations` (introduced by this patch) by the call `setDisallowFPContract()`. If it is removed, I think, the output would be identical. https://github.com/llvm/llvm-project/pull/85605 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
