Matt Arsenault 54d755a034 DAG: Fix incorrect folding of fmul -1 to fneg ...

The fmul is a canonicalizing operation, and fneg is not so this would
break denormals that need flushing and also would not quiet signaling
nans. Fold to fsub instead, which is also canonicalizing.

2021-09-14 21:25:02 -04:00

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