forked from OSchip/llvm-project
34 lines
1.2 KiB
LLVM
34 lines
1.2 KiB
LLVM
; RUN: opt -loop-load-elim -S < %s | FileCheck %s
|
|
|
|
; Make sure we create a preheader if we dont' have one.
|
|
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
|
|
define void @f(i32* noalias nocapture %A, i32* noalias nocapture readonly %B, i64 %N, i1 %C) {
|
|
entry:
|
|
br i1 %C, label %for.body, label %for.end
|
|
|
|
; CHECK: for.body.preheader:
|
|
; CHECK-NEXT: %load_initial = load i32, i32* %A
|
|
; CHECK-NEXT: br label %for.body
|
|
|
|
; CHECK: for.body:
|
|
for.body:
|
|
; CHECK-NEXT: %store_forwarded = phi i32 [ %load_initial, %for.body.preheader ], [ %add, %for.body ]
|
|
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
|
|
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
|
|
%load = load i32, i32* %arrayidx, align 4
|
|
%arrayidx2 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
|
|
%load_1 = load i32, i32* %arrayidx2, align 4
|
|
; CHECK: %add = add i32 %load_1, %store_forwarded
|
|
%add = add i32 %load_1, %load
|
|
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
|
%arrayidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
|
|
store i32 %add, i32* %arrayidx_next, align 4
|
|
%exitcond = icmp eq i64 %indvars.iv.next, %N
|
|
br i1 %exitcond, label %for.end, label %for.body
|
|
|
|
for.end:
|
|
ret void
|
|
}
|