mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-30 05:29:47 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48527 91177308-0d34-0410-b5e6-96231b3b80d8
22 lines
678 B
LLVM
22 lines
678 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 | %prcontext load 1 | grep Out:
|
|
|
|
@X = global i32 5 ; <i32*> [#uses=1]
|
|
|
|
define i32 @test(i32 %N) {
|
|
Entry:
|
|
br label %Loop
|
|
Loop: ; preds = %Loop, %Entry
|
|
%N_addr.0.pn = phi i32 [ %dec, %Loop ], [ %N, %Entry ] ; <i32> [#uses=2]
|
|
%tmp.6 = load i32* @X ; <i32> [#uses=1]
|
|
%dec = add i32 %N_addr.0.pn, -1 ; <i32> [#uses=1]
|
|
%tmp.1 = icmp ne i32 %N_addr.0.pn, 1 ; <i1> [#uses=1]
|
|
br i1 %tmp.1, label %Loop, label %Out
|
|
Out: ; preds = %Loop
|
|
ret i32 %tmp.6
|
|
}
|
|
|