| ; RUN: opt < %s -basic-aa -loops -gvn -enable-load-in-loop-pre=false -S | FileCheck %s |
| target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" |
| |
| ;void test1(int N, double *G) { |
| ; int j; |
| ; for (j = 0; j < N - 1; j++) |
| ; G[j] = G[j] + G[j+1]; |
| ;} |
| |
| define void @test1(i32 %N, double* nocapture %G) nounwind ssp { |
| ; CHECK-LABEL: @test1( |
| entry: |
| %0 = add i32 %N, -1 |
| %1 = icmp sgt i32 %0, 0 |
| br i1 %1, label %bb.nph, label %return |
| |
| bb.nph: |
| %tmp = zext i32 %0 to i64 |
| br label %bb |
| |
| ; CHECK: bb.nph: |
| ; CHECK-NOT: load double, double* |
| ; CHECK: br label %bb |
| |
| bb: |
| %indvar = phi i64 [ 0, %bb.nph ], [ %tmp6, %bb ] |
| %tmp6 = add i64 %indvar, 1 |
| %scevgep = getelementptr double, double* %G, i64 %tmp6 |
| %scevgep7 = getelementptr double, double* %G, i64 %indvar |
| %2 = load double, double* %scevgep7, align 8 |
| %3 = load double, double* %scevgep, align 8 |
| %4 = fadd double %2, %3 |
| store double %4, double* %scevgep7, align 8 |
| %exitcond = icmp eq i64 %tmp6, %tmp |
| br i1 %exitcond, label %return, label %bb |
| |
| ; Both loads should remain in the loop. |
| ; CHECK: bb: |
| ; CHECK: load double, double* |
| ; CHECK: load double, double* |
| ; CHECK: br i1 %exitcond |
| |
| return: |
| ret void |
| } |