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 14define i32 @test1(i32 %X) { 15 %Z = shl i32 %X, 2 ; <i32> [#uses=1] 16 volatile store i32 %Z, i32* @G 17 ret i32 %X 18} 19 20