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Diffstat (limited to 'test/CodeGen/X86/mul-shift-reassoc.ll')
-rw-r--r-- | test/CodeGen/X86/mul-shift-reassoc.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/CodeGen/X86/mul-shift-reassoc.ll b/test/CodeGen/X86/mul-shift-reassoc.ll new file mode 100644 index 0000000..3777d8b --- /dev/null +++ b/test/CodeGen/X86/mul-shift-reassoc.ll @@ -0,0 +1,12 @@ +; RUN: llc < %s -march=x86 | grep lea +; RUN: llc < %s -march=x86 | not grep add + +define i32 @test(i32 %X, i32 %Y) { + ; Push the shl through the mul to allow an LEA to be formed, instead + ; of using a shift and add separately. + %tmp.2 = shl i32 %X, 1 ; <i32> [#uses=1] + %tmp.3 = mul i32 %tmp.2, %Y ; <i32> [#uses=1] + %tmp.5 = add i32 %tmp.3, %Y ; <i32> [#uses=1] + ret i32 %tmp.5 +} + |