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14 Commits

Author SHA1 Message Date
Steven Wu 881916dea5 Fix another infinite loop in InstCombine 
Summary:
InstCombine infinite-loops for the testcase added
It is because InstCombine is generating instructions that can be
optimized by itself. Fix by not optimizing frem if the optimized
type is the same as original type.
rdar://problem/19150820

Reviewers: majnemer

Differential Revision: http://reviews.llvm.org/D6634

llvm-svn: 224097
 2014-12-12 04:34:07 +00:00
David Majnemer c6b8e20a5c InstCombine: Fix another infinite loop caused by visitFPTrunc 
We would attempt to replace an frem's operand with the same operand.
This would cause InstCombine to think real work was done, causing
InstCombine to enter an infinite loop.

This fixes the second part of PR21576.

llvm-svn: 222265
 2014-11-18 22:06:45 +00:00
David Majnemer b32eaddf11 Revert "Revert r222040 because of bot failure." 
This reverts commit r222203, reverting r222040 didn't end up turning the
bot green.

llvm-svn: 222261
 2014-11-18 21:30:02 +00:00
Manman Ren a64bd44fd8 Revert r222040 because of bot failure. 
http://lab.llvm.org:8080/green/job/clang-Rlto_master/298/
Hopefully, bot will be green.

llvm-svn: 222203
 2014-11-18 00:33:22 +00:00
David Majnemer 8c3d92e7e5 InstCombine: Fix infinite loop caused by visitFPTrunc 
We would attempt to replace a fptrunc of an frem with an identical
fptrunc.  This would cause the new fptrunc to be added to the worklist.
Of course, this results in an infinite loop because we will keep
visiting the newly created fptruncs.

This fixes PR21576.

llvm-svn: 222040
 2014-11-14 21:21:15 +00:00
Owen Anderson 48b842ef7c Fix more instances of dropped fast math flags when optimizing FADD instructions. All found by inspection (aka grep). 
llvm-svn: 199528
 2014-01-18 00:48:14 +00:00
Owen Anderson 5797bfd4a3 Pull fptrunc's upwards through selects when one of the select's selectands was a constant. This has a number of benefits, including producing small immediates (easier to materialize, smaller constant pools) as well as being more likely to allow the fptrunc to fuse with a preceding instruction (truncating selects are unusual). 
llvm-svn: 191929
 2013-10-03 21:08:05 +00:00
Owen Anderson dbf0ca523d Teach InstCombine to hoist FABS and FNEG through FPTRUNC instructions. The application of these operations commutes with the truncation, so we should prefer to do them in the smallest size we can, to save register space, use smaller constant pool entries, etc. 
llvm-svn: 172117
 2013-01-10 22:06:52 +00:00
Edward O'Callaghan cbf75a5dc3 Convert the rest of the InstCombine tests from notcast to FileCheck. 
llvm-svn: 83828
 2009-10-12 07:18:14 +00:00
Dan Gohman c8054d90fb Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81293
 2009-09-09 00:09:15 +00:00
Dan Gohman 72a13d2476 Use opt -S instead of piping bitcode output through llvm-dis. 
llvm-svn: 81257
 2009-09-08 22:34:10 +00:00
Tanya Lattner aa6f5c9ddd Remove llvm-upgrade and update tests. 
llvm-svn: 48103
 2008-03-09 08:16:40 +00:00
Reid Spencer be88bc4cb4 This test needs to use egrep. 
llvm-svn: 36012
 2007-04-14 20:02:51 +00:00
Reid Spencer 83b3d82672 Regression is gone, don't try to find it on clean target. 
llvm-svn: 33296
 2007-01-17 07:59:14 +00:00