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Folks, I've been asking around people about the state of FP contract, which seems to be "on" but it's not really behaving like it, at least not as I would expect: int foo(float a, float b, float c) { return a*b+c; } $ clang -target aarch64-linux-gnu -O2 -S fma.c -ffp-contract=on -o - (...) fmul s0, s0, s1 fadd s0, s0, s2 (...) $ clang -target aarch64-linux-gnu -O2 -S fma.c