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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 | 1877ac993757e7e7290b9b1e9f3a0f11dd2f5c28 (patch) | |
| tree | 5f3085cf8439836d79af57cafccd35d956aa1ee7 /llvm/test/CodeGen/X86/shift-pair.ll | |
| parent | 4b6fed4babceb8021d971f7b943e346defe65879 (diff) | |
| download | bcm5719-llvm-1877ac993757e7e7290b9b1e9f3a0f11dd2f5c28.tar.gz bcm5719-llvm-1877ac993757e7e7290b9b1e9f3a0f11dd2f5c28.zip | |
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.
llvm-svn: 132809
Diffstat (limited to 'llvm/test/CodeGen/X86/shift-pair.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/shift-pair.ll | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/shift-pair.ll b/llvm/test/CodeGen/X86/shift-pair.ll new file mode 100644 index 00000000000..24ba1fc7707 --- /dev/null +++ b/llvm/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 +} |
