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5 Commits

Author SHA1 Message Date
Sanjay Patel c048a02b5b [InstCombine] fold FP trunc into exact itofp 
Similar to D79116 and rGbfd512160fe0 - if the 1st cast
is exact, then we can go directly to the destination
type because there is no double-rounding.
 2020-05-24 09:30:19 -04:00
Sanjay Patel 130a2356ae [InstCombine] add tests for FP cast of cast; NFC 
A fold of casts is proposed as a backend transform in D79187,
but we can also do that in IR (and that may obsolete the need
for a backend transform).
 2020-05-17 11:42:07 -04:00
Sanjay Patel 3c6b5d3674 [InstCombine] narrow select with FP casts 
Select doesn't change values, so truncate of extended operand cancels out.
 2019-12-05 11:12:44 -05:00
Sanjay Patel 403bb33a2e [InstCombine] add tests for fpext+select+fptrunc; NFC 2019-12-05 10:49:29 -05:00
Sanjay Patel 458c2759b1 [InstCombine] add tests for fptrunc; NFC 
llvm-svn: 371750
 2019-09-12 18:00:11 +00:00