| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -passes=indvars < %s | FileCheck %s |
| |
| target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| ; Make sure we don't branch by poison here. |
| define void @test(i32 %start) { |
| ; CHECK-LABEL: @test( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[START:%.*]], -1 |
| ; CHECK-NEXT: [[TMP1:%.*]] = zext i32 [[START]] to i64 |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: backedge: |
| ; CHECK-NEXT: br label [[LOOP]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ [[TMP1]], [[ENTRY:%.*]] ] |
| ; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nsw i64 [[INDVARS_IV]], -1 |
| ; CHECK-NEXT: [[INDVARS:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32 |
| ; CHECK-NEXT: [[LOOP_EXIT_COND:%.*]] = icmp slt i32 [[TMP0]], 11 |
| ; CHECK-NEXT: br i1 [[LOOP_EXIT_COND]], label [[EXIT:%.*]], label [[STUCK_PREHEADER:%.*]] |
| ; CHECK: stuck.preheader: |
| ; CHECK-NEXT: br label [[STUCK:%.*]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[IV_NEXT_LCSSA:%.*]] = phi i32 [ [[INDVARS]], [[LOOP]] ] |
| ; CHECK-NEXT: ret void |
| ; CHECK: stuck: |
| ; CHECK-NEXT: br i1 false, label [[BACKEDGE]], label [[STUCK]] |
| ; |
| entry: |
| br label %loop |
| |
| backedge: ; preds = %stuck |
| br label %loop |
| |
| loop: ; preds = %backedge, %entry |
| %iv = phi i32 [ %start, %entry ], [ %iv.next, %backedge ] |
| %iv.zext = zext i32 %iv to i64 |
| %gep = getelementptr inbounds i64, ptr undef, i64 %iv.zext |
| %iv.next = add i32 %iv, -1 |
| %loop.exit.cond = icmp slt i32 %iv.next, 11 |
| br i1 %loop.exit.cond, label %exit, label %stuck |
| |
| exit: ; preds = %loop |
| %iv.next.lcssa = phi i32 [ %iv.next, %loop ] |
| ret void |
| |
| stuck: ; preds = %stuck, %loop |
| br i1 false, label %backedge, label %stuck |
| } |
