1 ;; X's live range extends beyond the shift, so the register allocator 2 ;; cannot coalesce it with Y. Because of this, a copy needs to be 3 ;; emitted before the shift to save the register value before it is 4 ;; clobbered. However, this copy is not needed if the register 5 ;; allocator turns the shift into an LEA. This also occurs for ADD. 6 7 ; Check that the shift gets turned into an LEA. 8 9 ; RUN: llc < %s -march=x86 -x86-asm-syntax=intel | \ 10 ; RUN: not grep "mov E.X, E.X" 11 12 @G = external global i32 ; <i32*> [#uses=1] 13 14 define i32 @test1(i32 %X) { 15 %Z = shl i32 %X, 2 ; <i32> [#uses=1] 16 store volatile i32 %Z, i32* @G 17 ret i32 %X 18 } 19 20
