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| author | Chris Lattner <sabre@nondot.org> | 2005-04-21 05:31:13 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-04-21 05:31:13 +0000 |
| commit | b38b443b15f6c97371e3596b91444b1b09ebeb37 (patch) | |
| tree | 04b683bd52c6c1b7dea2778ef2acbd558552a711 /llvm/lib/Target/TargetInstrInfo.cpp | |
| parent | b7848974cdc2b476514ee9b260e59a23ceb0e39f (diff) | |
| download | bcm5719-llvm-b38b443b15f6c97371e3596b91444b1b09ebeb37.tar.gz bcm5719-llvm-b38b443b15f6c97371e3596b91444b1b09ebeb37.zip | |
Teach simplifycfg that setcc is cheap and non-trapping, so that it can
convert this:
%tmp.1 = seteq int %i, 0 ; <bool> [#uses=1]
br bool %tmp.1, label %shortcirc_done, label %shortcirc_next
shortcirc_next: ; preds = %entry
%tmp.4 = seteq int %j, 0 ; <bool> [#uses=1]
br label %shortcirc_done
shortcirc_done: ; preds = %shortcirc_next, %entry
%shortcirc_val = phi bool [ %tmp.4, %shortcirc_next ], [ true, %entry ] ; <bool> [#uses=1]
to this:
%tmp.1 = seteq int %i, 0 ; <bool> [#uses=1]
%tmp.4 = seteq int %j, 0 ; <bool> [#uses=1]
%shortcirc_val = select bool %tmp.1, bool true, bool %tmp.4 ; <bool> [#uses=1]
... which is later simplified by instcombine into an or.
llvm-svn: 21388
Diffstat (limited to 'llvm/lib/Target/TargetInstrInfo.cpp')
0 files changed, 0 insertions, 0 deletions
