| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -indvars -S | FileCheck %s |
| |
| ; PR31181: It may be necessary to drop nuw/nsw flags when moving from a |
| ; pre-increment comparison to a post-increment comparison. |
| |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| |
| @a = global i32 0 |
| |
| define i32 @test_drop_nuw() { |
| ; CHECK-LABEL: @test_drop_nuw( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ -2, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[LOOP]] ] |
| ; CHECK-NEXT: store i32 [[STOREMERGE]], i32* @a |
| ; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[STOREMERGE]], 1 |
| ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC]], 0 |
| ; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %storemerge = phi i32 [ -2, %entry ], [ %inc, %loop ] |
| store i32 %storemerge, i32* @a |
| %cmp = icmp slt i32 %storemerge, -1 |
| %inc = add nuw nsw i32 %storemerge, 1 |
| br i1 %cmp, label %loop, label %exit |
| |
| exit: |
| ret i32 0 |
| } |
| |
| define i32 @test_drop_nsw() { |
| ; CHECK-LABEL: @test_drop_nsw( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[LOOP]] ] |
| ; CHECK-NEXT: store i32 [[STOREMERGE]], i32* @a |
| ; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[STOREMERGE]], 1 |
| ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC]], -2147483648 |
| ; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %storemerge = phi i32 [ 0, %entry ], [ %inc, %loop ] |
| store i32 %storemerge, i32* @a |
| %cmp = icmp ult i32 %storemerge, 2147483647 |
| %inc = add nuw nsw i32 %storemerge, 1 |
| br i1 %cmp, label %loop, label %exit |
| |
| exit: |
| ret i32 0 |
| } |
| |
| define i32 @test_no_drop_nuw() { |
| ; CHECK-LABEL: @test_no_drop_nuw( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ -3, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[LOOP]] ] |
| ; CHECK-NEXT: store i32 [[STOREMERGE]], i32* @a |
| ; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[STOREMERGE]], 1 |
| ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC]], -1 |
| ; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %storemerge = phi i32 [ -3, %entry ], [ %inc, %loop ] |
| store i32 %storemerge, i32* @a |
| %cmp = icmp slt i32 %storemerge, -2 |
| %inc = add nuw nsw i32 %storemerge, 1 |
| br i1 %cmp, label %loop, label %exit |
| |
| exit: |
| ret i32 0 |
| } |
| |
| |
| define i32 @test_no_drop_nsw() { |
| ; CHECK-LABEL: @test_no_drop_nsw( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[LOOP]] ] |
| ; CHECK-NEXT: store i32 [[STOREMERGE]], i32* @a |
| ; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[STOREMERGE]], 1 |
| ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC]], 2147483647 |
| ; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| br label %loop |
| |
| loop: |
| %storemerge = phi i32 [ 0, %entry ], [ %inc, %loop ] |
| store i32 %storemerge, i32* @a |
| %cmp = icmp ult i32 %storemerge, 2147483646 |
| %inc = add nuw nsw i32 %storemerge, 1 |
| br i1 %cmp, label %loop, label %exit |
| |
| exit: |
| ret i32 0 |
| } |
| |
| define i32 @test_drop_nsw_var_lim(i32 %lim) { |
| ; CHECK-LABEL: @test_drop_nsw_var_lim( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: [[C:%.*]] = icmp ult i32 [[LIM:%.*]], -1 |
| ; CHECK-NEXT: br i1 [[C]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]] |
| ; CHECK: loop.preheader: |
| ; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[LIM]], 1 |
| ; CHECK-NEXT: br label [[LOOP:%.*]] |
| ; CHECK: loop: |
| ; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ [[INC:%.*]], [[LOOP]] ], [ 0, [[LOOP_PREHEADER]] ] |
| ; CHECK-NEXT: store i32 [[STOREMERGE]], i32* @a |
| ; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[STOREMERGE]], 1 |
| ; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC]], [[TMP0]] |
| ; CHECK-NEXT: br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]] |
| ; CHECK: exit.loopexit: |
| ; CHECK-NEXT: br label [[EXIT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: ret i32 0 |
| ; |
| entry: |
| %c = icmp ult i32 %lim, -1 |
| br i1 %c, label %loop, label %exit |
| |
| loop: |
| %storemerge = phi i32 [ 0, %entry ], [ %inc, %loop ] |
| store i32 %storemerge, i32* @a |
| %cmp = icmp ult i32 %storemerge, %lim |
| %inc = add nuw nsw i32 %storemerge, 1 |
| br i1 %cmp, label %loop, label %exit |
| |
| exit: |
| ret i32 0 |
| } |