Mercurial > hg > Members > tobaru > cbc > CbC_llvm
view test/CodeGen/X86/overlap-shift.ll @ 33:e4204d083e25
LLVM 3.5
author | Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp> |
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date | Thu, 12 Dec 2013 14:32:10 +0900 |
parents | 95c75e76d11b |
children | 803732b1fca8 |
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;; X's live range extends beyond the shift, so the register allocator ;; cannot coalesce it with Y. Because of this, a copy needs to be ;; emitted before the shift to save the register value before it is ;; clobbered. However, this copy is not needed if the register ;; allocator turns the shift into an LEA. This also occurs for ADD. ; Check that the shift gets turned into an LEA. ; RUN: llc < %s -march=x86 -x86-asm-syntax=intel | \ ; RUN: not grep "mov E.X, E.X" @G = external global i32 ; <i32*> [#uses=1] define i32 @test1(i32 %X) { %Z = shl i32 %X, 2 ; <i32> [#uses=1] store volatile i32 %Z, i32* @G ret i32 %X }