| ; RUN: opt < %s -S -loop-unroll -unroll-threshold=150 | FileCheck %s |
| ; |
| ; Verify that trunc i64 to i32 is considered free by loop unrolling |
| ; heuristics when i32 is a native type. |
| ; This should result in full unrolling this loop with size=7, TC=19. |
| ; If the trunc were not free we would have 8*19=152 > 150. |
| |
| 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" |
| |
| ; Check that for.body was unrolled 19 times. |
| ; CHECK-LABEL: @test( |
| ; CHECK: %0 = load |
| ; CHECK: %conv = sext i8 %0 to i32 |
| ; CHECK: %add.1 = add nsw i32 %conv.1, %conv |
| ; CHECK: %add.18 = add nsw i32 %conv.18, %add.17 |
| ; CHECK: ret i32 %add.18 |
| define i32 @test(i8* %arr) nounwind uwtable readnone { |
| entry: |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %entry |
| %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] |
| %sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ] |
| %arrayidx = getelementptr inbounds i8, i8* %arr, i64 %indvars.iv |
| %0 = load i8, i8* %arrayidx, align 1 |
| %conv = sext i8 %0 to i32 |
| %add = add nsw i32 %conv, %sum.02 |
| %indvars.iv.next = add i64 %indvars.iv, 1 |
| %lftr.wideiv1 = trunc i64 %indvars.iv.next to i32 |
| %exitcond2 = icmp eq i32 %lftr.wideiv1, 19 |
| br i1 %exitcond2, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body |
| %add.lcssa = phi i32 [ %add, %for.body ] |
| ret i32 %add.lcssa |
| } |