llvm/include
James Molloy cd45f4f580 Add support for floating-point minnum and maxnum
The select pattern recognition in ValueTracking (as used by InstCombine
and SelectionDAGBuilder) only knew about integer patterns. This teaches
it about minimum and maximum operations.

matchSelectPattern() has been extended to return a struct containing the
existing Flavor and a new enum defining the pattern's behavior when
given one NaN operand.

C minnum() is defined to return the non-NaN operand in this case, but
the idiomatic C "a < b ? a : b" would return the NaN operand.

ARM and AArch64 at least have different instructions for these different cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244580 91177308-0d34-0410-b5e6-96231b3b80d8
2015-08-11 09:12:57 +00:00
..
llvm Add support for floating-point minnum and maxnum 2015-08-11 09:12:57 +00:00
llvm-c Add support to set/get ordering for load/store from the C API 2015-08-02 12:16:57 +00:00