| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -loop-reduce < %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" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| declare void @use(i8 zeroext) |
| declare void @use_p(i8*) |
| |
| ; nuw needs to be dropped when switching to post-inc comparison. |
| define i8 @drop_nuw() { |
| ; CHECK-LABEL: @drop_nuw( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] |
| ; CHECK-NEXT: call void @use(i8 zeroext [[IV]]) |
| ; CHECK-NEXT: [[IV_NEXT]] = add i8 [[IV]], 1 |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[IV_NEXT]], 0 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[TMP0:%.*]] = add i8 [[IV_NEXT]], -1 |
| ; CHECK-NEXT: ret i8 [[TMP0]] |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %iv = phi i8 [ 0, %entry ], [ %iv.next, %loop ] |
| call void @use(i8 zeroext %iv) |
| |
| %iv.next = add nuw i8 %iv, 1 |
| %cmp = icmp eq i8 %iv, -1 |
| br i1 %cmp, label %exit, label %loop |
| |
| exit: |
| ret i8 %iv |
| } |
| |
| ; nsw needs to be dropped when switching to post-inc comparison. |
| define i8 @drop_nsw() { |
| ; CHECK-LABEL: @drop_nsw( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i8 [ 127, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] |
| ; CHECK-NEXT: call void @use(i8 zeroext [[IV]]) |
| ; CHECK-NEXT: [[IV_NEXT]] = add i8 [[IV]], -1 |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[IV_NEXT]], 127 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[TMP0:%.*]] = add i8 [[IV_NEXT]], 1 |
| ; CHECK-NEXT: ret i8 [[TMP0]] |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %iv = phi i8 [ 127, %entry ], [ %iv.next, %loop ] |
| call void @use(i8 zeroext %iv) |
| |
| %iv.next = add nsw i8 %iv, -1 |
| %cmp = icmp eq i8 %iv, -128 |
| br i1 %cmp, label %exit, label %loop |
| |
| exit: |
| ret i8 %iv |
| } |
| |
| ; Comparison already in post-inc form, no need to drop nuw. |
| define i8 @already_postinc() { |
| ; CHECK-LABEL: @already_postinc( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[IV:%.*]] = phi i8 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] |
| ; CHECK-NEXT: call void @use(i8 zeroext [[IV]]) |
| ; CHECK-NEXT: [[IV_NEXT]] = add nuw i8 [[IV]], 1 |
| ; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[IV_NEXT]], -1 |
| ; CHECK-NEXT: br i1 [[CMP]], label [[EXIT:%.*]], label [[LOOP]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[TMP0:%.*]] = add i8 [[IV_NEXT]], -1 |
| ; CHECK-NEXT: ret i8 [[TMP0]] |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %iv = phi i8 [ 0, %entry ], [ %iv.next, %loop ] |
| call void @use(i8 zeroext %iv) |
| |
| %iv.next = add nuw i8 %iv, 1 |
| %cmp = icmp eq i8 %iv.next, -1 |
| br i1 %cmp, label %exit, label %loop |
| |
| exit: |
| ret i8 %iv |
| } |