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Author SHA1 Message Date
QingShan Zhang d48ac7d54d [DAGCombine] Fold the (fma -x, y, -z) to -(fma x, y, z) 
This is a positive combination as long as the NEG is NOT free,
as we are reducing the number of NEG from two to one.

Differential Revision: https://reviews.llvm.org/D72312
 2020-01-09 04:33:46 +00:00
QingShan Zhang 44f78f368c [NFC][Test] Add the option -enable-no-signed-zeros-fp-math for test 
fma-combine.ll
 2020-01-08 06:48:51 +00:00
QingShan Zhang d877229b5b [NFC][Test] Add a test to verify the DAGCombine of fma 2020-01-07 03:13:39 +00:00