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| author | Hal Finkel <hfinkel@anl.gov> | 2013-09-12 23:57:55 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-09-12 23:57:55 +0000 |
| commit | 28b2ae3692e507e307efb3c775d8d3b27e40c10c (patch) | |
| tree | c82dd100020454a315788747bf6b27a1f6374efd /clang/lib/CodeGen/CGExprComplex.cpp | |
| parent | 0167a313dadfeb3239568dbe39f781e07ea4be9e (diff) | |
| download | bcm5719-llvm-28b2ae3692e507e307efb3c775d8d3b27e40c10c.tar.gz bcm5719-llvm-28b2ae3692e507e307efb3c775d8d3b27e40c10c.zip | |
Restore the sqrt -> llvm.sqrt mapping in fast-math mode
This restores the sqrt -> llvm.sqrt mapping, but only in fast-math mode
(specifically, when the UnsafeFPMath or NoNaNsFPMath CodeGen options are
enabled). The @llvm.sqrt* intrinsics have slightly different semantics from the
libm call, specifically, they are undefined when given a non-zero negative
number (the libm calls will always return NaN for any negative number).
This mapping was removed in r100613, and replaced with a TODO, but at that time
the fast-math flags were not yet implemented. Now that we have these, restoring
this mapping is important because it will enable autovectorization of sqrt
calls in loops (at least in fast-math mode).
llvm-svn: 190646
Diffstat (limited to 'clang/lib/CodeGen/CGExprComplex.cpp')
0 files changed, 0 insertions, 0 deletions
