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[Test] Add tests showing that IndVars cannot prove (X + 1 > X)

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Max Kazantsev 2020-09-17 22:36:41 +07:00
parent f0e028f4b3
commit 7688027f16
1 changed files with 186 additions and 0 deletions
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186
llvm/test/Transforms/IndVarSimplify/trivial-checks.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -indvars -S < %s | FileCheck %s
; RUN: opt -passes=indvars -S < %s | FileCheck %s
; FIXME: In all cases, x is from [0; 1000) and we cannot prove that x + 1 > x.
define void @test_sgt(i32 %x) {
; CHECK-LABEL: @test_sgt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PRECONDITION:%.*]] = icmp ult i32 [[X:%.*]], 1000
; CHECK-NEXT: br i1 [[PRECONDITION]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[X]], [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[TMP:%.*]] = add i32 [[IV]], 1
; CHECK-NEXT: [[GUARD:%.*]] = icmp sgt i32 [[TMP]], [[IV]]
; CHECK-NEXT: br i1 [[GUARD]], label [[GUARDED]], label [[FAIL:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV]], 0
; CHECK-NEXT: br i1 [[COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK: exit.loopexit:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: fail:
; CHECK-NEXT: unreachable
;
entry:
%precondition = icmp ult i32 %x, 1000
br i1 %precondition, label %loop, label %exit
loop:
%iv = phi i32 [%x, %entry], [%iv.next, %guarded]
%tmp = add i32 %iv, 1
%guard = icmp sgt i32 %tmp, %iv
br i1 %guard, label %guarded, label %fail
guarded:
%iv.next = add i32 %iv, -1
%cond = icmp eq i32 %iv, 0
br i1 %cond, label %loop, label %exit
exit:
ret void
fail:
unreachable
}
define void @test_sge(i32 %x) {
; CHECK-LABEL: @test_sge(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PRECONDITION:%.*]] = icmp ult i32 [[X:%.*]], 1000
; CHECK-NEXT: br i1 [[PRECONDITION]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[X]], [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[TMP:%.*]] = add i32 [[IV]], 1
; CHECK-NEXT: [[GUARD:%.*]] = icmp sge i32 [[TMP]], [[IV]]
; CHECK-NEXT: br i1 [[GUARD]], label [[GUARDED]], label [[FAIL:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV]], 0
; CHECK-NEXT: br i1 [[COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK: exit.loopexit:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: fail:
; CHECK-NEXT: unreachable
;
entry:
%precondition = icmp ult i32 %x, 1000
br i1 %precondition, label %loop, label %exit
loop:
%iv = phi i32 [%x, %entry], [%iv.next, %guarded]
%tmp = add i32 %iv, 1
%guard = icmp sge i32 %tmp, %iv
br i1 %guard, label %guarded, label %fail
guarded:
%iv.next = add i32 %iv, -1
%cond = icmp eq i32 %iv, 0
br i1 %cond, label %loop, label %exit
exit:
ret void
fail:
unreachable
}
define void @test_ugt(i32 %x) {
; CHECK-LABEL: @test_ugt(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PRECONDITION:%.*]] = icmp ult i32 [[X:%.*]], 1000
; CHECK-NEXT: br i1 [[PRECONDITION]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[X]], [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[TMP:%.*]] = add i32 [[IV]], 1
; CHECK-NEXT: [[GUARD:%.*]] = icmp ugt i32 [[TMP]], [[IV]]
; CHECK-NEXT: br i1 [[GUARD]], label [[GUARDED]], label [[FAIL:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV]], 0
; CHECK-NEXT: br i1 [[COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK: exit.loopexit:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: fail:
; CHECK-NEXT: unreachable
;
entry:
%precondition = icmp ult i32 %x, 1000
br i1 %precondition, label %loop, label %exit
loop:
%iv = phi i32 [%x, %entry], [%iv.next, %guarded]
%tmp = add i32 %iv, 1
%guard = icmp ugt i32 %tmp, %iv
br i1 %guard, label %guarded, label %fail
guarded:
%iv.next = add i32 %iv, -1
%cond = icmp eq i32 %iv, 0
br i1 %cond, label %loop, label %exit
exit:
ret void
fail:
unreachable
}
define void @test_uge(i32 %x) {
; CHECK-LABEL: @test_uge(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PRECONDITION:%.*]] = icmp ult i32 [[X:%.*]], 1000
; CHECK-NEXT: br i1 [[PRECONDITION]], label [[LOOP_PREHEADER:%.*]], label [[EXIT:%.*]]
; CHECK: loop.preheader:
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[GUARDED:%.*]] ], [ [[X]], [[LOOP_PREHEADER]] ]
; CHECK-NEXT: [[TMP:%.*]] = add i32 [[IV]], 1
; CHECK-NEXT: [[GUARD:%.*]] = icmp uge i32 [[TMP]], [[IV]]
; CHECK-NEXT: br i1 [[GUARD]], label [[GUARDED]], label [[FAIL:%.*]]
; CHECK: guarded:
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], -1
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV]], 0
; CHECK-NEXT: br i1 [[COND]], label [[LOOP]], label [[EXIT_LOOPEXIT:%.*]]
; CHECK: exit.loopexit:
; CHECK-NEXT: br label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: fail:
; CHECK-NEXT: unreachable
;
entry:
%precondition = icmp ult i32 %x, 1000
br i1 %precondition, label %loop, label %exit
loop:
%iv = phi i32 [%x, %entry], [%iv.next, %guarded]
%tmp = add i32 %iv, 1
%guard = icmp uge i32 %tmp, %iv
br i1 %guard, label %guarded, label %fail
guarded:
%iv.next = add i32 %iv, -1
%cond = icmp eq i32 %iv, 0
br i1 %cond, label %loop, label %exit
exit:
ret void
fail:
unreachable
}