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6 Commits

Author SHA1 Message Date
Andrew Kaylor
68d0bd1ed4 Add strictfp attribute to prevent unwanted optimizations of libm calls 
Differential Revision: https://reviews.llvm.org/D34163



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310885 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-08-14 21:15:13 +00:00
Andrew Kaylor
b8e9164d09 [InstSimplify] Don't constant fold or DCE calls that are marked nobuiltin 
Differential Revision: https://reviews.llvm.org/D33737

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305132 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-06-09 23:18:11 +00:00
NAKAMURA Takumi
933679bb33 llvm/test/Transforms/DCE/calls-errno.ll: Suppress checking @pow(+0,-1). 
It depends on host's pow(3), and mingw's pow doesn't raise any errors, just returns +INF.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286005 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-11-04 18:50:45 +00:00
Eli Friedman
a7bfb15b26 DCE math library calls with a constant operand. 
On platforms which use -fmath-errno, math libcalls without any uses
require some extra checks to figure out if they are actually dead.

Fixes https://llvm.org/bugs/show_bug.cgi?id=30464 .

Differential Revision: https://reviews.llvm.org/D25970



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285857 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-11-02 20:48:11 +00:00
Sanjoy Das
3aa5468391 Mark guards on true as "trivially dead" 
This moves some logic added to EarlyCSE in rL268120 into
`llvm::isInstructionTriviallyDead`.  Adds a test case for DCE to
demonstrate that passes other than EarlyCSE can now pick up on the new
information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268126 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-29 22:23:16 +00:00
Justin Bogner
04d2814f0b PM: Port DCE to the new pass manager 
Also add a very basic test, since apparently there aren't any tests
for DCE whatsoever to add the new pass version to.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267196 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-04-22 19:40:41 +00:00