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| author | Eli Friedman <eli.friedman@gmail.com> | 2011-06-09 22:14:44 +0000 |
|---|---|---|
| committer | Eli Friedman <eli.friedman@gmail.com> | 2011-06-09 22:14:44 +0000 |
| commit | 2a6d9eb10bc268df18ff57531c34b8928f858471 (patch) | |
| tree | 2a4bd7716cb6d103ddc7eee4359a98f7c274ee96 /test/CodeGen/X86 | |
| parent | a899b223109ca5dba7b44439e955148a03f23d4c (diff) | |
| download | llvm-2a6d9eb10bc268df18ff57531c34b8928f858471.tar.gz llvm-2a6d9eb10bc268df18ff57531c34b8928f858471.tar.bz2 llvm-2a6d9eb10bc268df18ff57531c34b8928f858471.tar.xz | |
Change this DAGCombine to build AND of SHR instead of SHR of AND; this matches the ordering we prefer in instcombine. Part of rdar://9562809.
The potential DAGCombine which enforces this more generally messes up some other very fragile patterns, so I'm leaving that alone, at least for now.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132809 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86')
| -rw-r--r-- | test/CodeGen/X86/shift-pair.ll | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/test/CodeGen/X86/shift-pair.ll b/test/CodeGen/X86/shift-pair.ll new file mode 100644 index 0000000000..24ba1fc770 --- /dev/null +++ b/test/CodeGen/X86/shift-pair.ll @@ -0,0 +1,11 @@ +; RUN: llc < %s -march=x86-64 | FileCheck %s + +define i64 @test(i64 %A) { +; CHECK: @test +; CHECK: shrq $54 +; CHECK: andq $1020 +; CHECK: ret + %B = lshr i64 %A, 56 + %C = shl i64 %B, 2 + ret i64 %C +} |