1; RUN: opt < %s -basic-aa -loops -gvn -enable-load-in-loop-pre=false -S | FileCheck %s 2target 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" 3 4;void test1(int N, double *G) { 5; int j; 6; for (j = 0; j < N - 1; j++) 7; G[j] = G[j] + G[j+1]; 8;} 9 10define void @test1(i32 %N, double* nocapture %G) nounwind ssp { 11; CHECK-LABEL: @test1( 12entry: 13 %0 = add i32 %N, -1 14 %1 = icmp sgt i32 %0, 0 15 br i1 %1, label %bb.nph, label %return 16 17bb.nph: 18 %tmp = zext i32 %0 to i64 19 br label %bb 20 21; CHECK: bb.nph: 22; CHECK-NOT: load double, double* 23; CHECK: br label %bb 24 25bb: 26 %indvar = phi i64 [ 0, %bb.nph ], [ %tmp6, %bb ] 27 %tmp6 = add i64 %indvar, 1 28 %scevgep = getelementptr double, double* %G, i64 %tmp6 29 %scevgep7 = getelementptr double, double* %G, i64 %indvar 30 %2 = load double, double* %scevgep7, align 8 31 %3 = load double, double* %scevgep, align 8 32 %4 = fadd double %2, %3 33 store double %4, double* %scevgep7, align 8 34 %exitcond = icmp eq i64 %tmp6, %tmp 35 br i1 %exitcond, label %return, label %bb 36 37; Both loads should remain in the loop. 38; CHECK: bb: 39; CHECK: load double, double* 40; CHECK: load double, double* 41; CHECK: br i1 %exitcond 42 43return: 44 ret void 45} 46