1 ; RUN: opt < %s -S -loop-unroll -unroll-max-iteration-count-to-analyze=100 -unroll-dynamic-cost-savings-discount=1000 -unroll-threshold=10 -unroll-percent-dynamic-cost-saved-threshold=60 | FileCheck %s 2 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 3 4 ; When examining gep-instructions we shouldn't consider them simplified if the 5 ; corresponding memory access isn't simplified. Doing the opposite might bias 6 ; our estimate, so that we might decide to unroll even a simple memcpy loop. 7 ; 8 ; Thus, the following loop shouldn't be unrolled: 9 ; CHECK-LABEL: @not_simplified_geps 10 ; CHECK: br i1 % 11 ; CHECK: ret void 12 define void @not_simplified_geps(i32* noalias %b, i32* noalias %c) { 13 entry: 14 br label %for.body 15 16 for.body: 17 %iv.0 = phi i64 [ 0, %entry ], [ %iv.1, %for.body ] 18 %arrayidx1 = getelementptr inbounds i32, i32* %b, i64 %iv.0 19 %x1 = load i32, i32* %arrayidx1, align 4 20 %arrayidx2 = getelementptr inbounds i32, i32* %c, i64 %iv.0 21 store i32 %x1, i32* %arrayidx2, align 4 22 %iv.1 = add nuw nsw i64 %iv.0, 1 23 %exitcond = icmp eq i64 %iv.1, 10 24 br i1 %exitcond, label %for.end, label %for.body 25 26 for.end: 27 ret void 28 } 29
