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.
7
; Check that the shift gets turned into an LEA.
9
; RUN: llc < %s -march=x86 -x86-asm-syntax=intel | \
10
; RUN: not grep {mov E.X, E.X}
12
@G = external global i32 ; <i32*> [#uses=1]
14
define i32 @test1(i32 %X) {
15
%Z = shl i32 %X, 2 ; <i32> [#uses=1]
16
volatile store i32 %Z, i32* @G