mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-30 15:32:52 +01:00
28 lines
821 B
LLVM
28 lines
821 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: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov %E.X, %E.X'
|
|
|
|
; FIXME: We need live variable information about flags to do this xform safely. :(
|
|
; XFAIL: *
|
|
|
|
%G = external global int
|
|
|
|
int %test1(int %X, int %Y) {
|
|
%Z = add int %X, %Y
|
|
volatile store int %Y, int* %G
|
|
volatile store int %Z, int* %G
|
|
ret int %X
|
|
}
|
|
|
|
int %test2(int %X) {
|
|
%Z = add int %X, 1 ;; inc
|
|
volatile store int %Z, int* %G
|
|
ret int %X
|
|
}
|