mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-25 14:32:53 +00:00
2faaddab60
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10339 91177308-0d34-0410-b5e6-96231b3b80d8
21 lines
564 B
LLVM
21 lines
564 B
LLVM
; To reduce register pressure, if a load is hoistable out of the loop, and the
|
|
; result of the load is only used outside of the loop, sink the load instead of
|
|
; hoisting it!
|
|
;
|
|
; RUN: llvm-as < %s | opt -licm | llvm-dis | grep -C1 load | grep Out:
|
|
|
|
%X = global int 5
|
|
|
|
int %test(int %N) {
|
|
Entry:
|
|
br label %Loop
|
|
Loop:
|
|
%N_addr.0.pn = phi int [ %dec, %Loop ], [ %N, %Entry ]
|
|
%tmp.6 = load int* %X
|
|
%dec = add int %N_addr.0.pn, -1
|
|
%tmp.1 = setne int %N_addr.0.pn, 1
|
|
br bool %tmp.1, label %Loop, label %Out
|
|
Out:
|
|
ret int %tmp.6
|
|
}
|