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| author | Chris Lattner <sabre@nondot.org> | 2011-01-23 22:04:55 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2011-01-23 22:04:55 +0000 |
| commit | a960725d18fd8686c517aecf25584a3c5a4da9d6 (patch) | |
| tree | 2bea6734b3a93421203f50f8f7a82f1a80487707 /clang/lib/CodeGen/CodeGenModule.cpp | |
| parent | e30621b62692622bdf8a5df7e59462efd4e69d58 (diff) | |
| download | bcm5719-llvm-a960725d18fd8686c517aecf25584a3c5a4da9d6.tar.gz bcm5719-llvm-a960725d18fd8686c517aecf25584a3c5a4da9d6.zip | |
Enhance SRoA to promote allocas that are used by selects in some
common cases. This triggers a surprising number of times in SPEC2K6
because min/max idioms end up doing this. For example, code from the
STL ends up looking like this to SRoA:
%202 = load i64* %__old_size, align 8, !tbaa !3
%203 = load i64* %__old_size, align 8, !tbaa !3
%204 = load i64* %__n, align 8, !tbaa !3
%205 = icmp ult i64 %203, %204
%storemerge.i = select i1 %205, i64* %__n, i64* %__old_size
%206 = load i64* %storemerge.i, align 8, !tbaa !3
We can now promote both the __n and the __old_size allocas.
This addresses another chunk of rdar://7339113, poor codegen on
stringswitch.
llvm-svn: 124088
Diffstat (limited to 'clang/lib/CodeGen/CodeGenModule.cpp')
0 files changed, 0 insertions, 0 deletions
