20 lines
682 B
LLVM
20 lines
682 B
LLVM
|
;; 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
|
||
|
|
}
|
||
|
|
|