forked from OSchip/llvm-project
112 lines
3.5 KiB
LLVM
112 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -disable-output -print-mustexecute %s 2>&1 | FileCheck %s
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; Infinite loop.
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; Make sure that the backedge is mustexec.
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define void @test_no_exit_block(i1 %cond, i32 %a, i32 %b) {
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; CHECK-LABEL: @test_no_exit_block(
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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: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ] ; (mustexec in: loop)
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[MAYBE_TAKEN:%.*]], label [[BACKEDGE]] ; (mustexec in: loop)
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; CHECK: maybe_taken:
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; CHECK-NOT: mustexec
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; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: br label [[BACKEDGE]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1 ; (mustexec in: loop)
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; CHECK-NEXT: br label [[LOOP]] ; (mustexec in: loop)
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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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%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
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br i1 %cond, label %maybe_taken, label %backedge
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maybe_taken:
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%div = sdiv i32 %a, %b
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br label %backedge
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backedge:
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%iv.next = add i32 %iv, 1
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br label %loop
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}
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; Unlike the test before, we can say that backedge is mustexec, which is the
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; correct behavior.
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define void @test_impossible_exit_on_latch(i1 %cond, i32 %a, i32 %b) {
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; CHECK-LABEL: @test_impossible_exit_on_latch(
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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: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ] ; (mustexec in: loop)
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[MAYBE_TAKEN:%.*]], label [[BACKEDGE]] ; (mustexec in: loop)
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; CHECK: maybe_taken:
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; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: br label [[BACKEDGE]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1 ; (mustexec in: loop)
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; CHECK-NEXT: br i1 true, label [[LOOP]], label [[EXIT:%.*]] ; (mustexec in: loop)
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; CHECK: exit:
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; CHECK-NEXT: ret void
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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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%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
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br i1 %cond, label %maybe_taken, label %backedge
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maybe_taken:
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%div = sdiv i32 %a, %b
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br label %backedge
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backedge:
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%iv.next = add i32 %iv, 1
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br i1 true, label %loop, label %exit
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exit:
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ret void
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}
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; Make sure that sdiv is NOT marked as mustexec.
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define void @test_impossible_exit_in_untaken_block(i1 %cond, i32 %a, i32 %b, i32* %p) {
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; CHECK-LABEL: @test_impossible_exit_in_untaken_block(
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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: [[IV:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ] ; (mustexec in: loop)
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[MAYBE_TAKEN:%.*]], label [[BACKEDGE]] ; (mustexec in: loop)
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; CHECK: maybe_taken:
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; CHECK-NOT: mustexec
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; CHECK-NEXT: [[DIV:%.*]] = sdiv i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: store i32 [[DIV]], i32* [[P:%.*]]
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; CHECK-NEXT: br i1 true, label [[BACKEDGE]], label [[EXIT:%.*]]
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; CHECK: backedge:
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; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1 ; (mustexec in: loop)
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; CHECK-NEXT: br label [[LOOP]] ; (mustexec in: loop)
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; CHECK: exit:
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; CHECK-NEXT: ret void
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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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%iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
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br i1 %cond, label %maybe_taken, label %backedge
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maybe_taken:
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%div = sdiv i32 %a, %b
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store i32 %div, i32* %p
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br i1 true, label %backedge, label %exit
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backedge:
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%iv.next = add i32 %iv, 1
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br label %loop
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exit:
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ret void
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}
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