Use canonicalize_math_after_vectorization_p for FMA folds
The folds in r260348 kicked in before vectorisation, which hurts for two reasons: (1) the current suboptimal handling of nothrow meant that we could drop the flag early and so prevent if-conversion (2) some architectures provide more scalar forms than vector forms (true for Advanced SIMD) (1) is a bug in itself that needs to be fixed eventually, but delaying the folds is still needed for (2). 2018-05-24 Richard Sandiford <richard.sandiford@linaro.org> gcc/ * match.pd: Delay FMA folds until after vectorization. gcc/testsuite/ * gcc.dg/vect/vect-fma-1.c: New test. From-SVN: r260639
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gcc/testsuite/gcc.dg/vect/vect-fma-1.c
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