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