96 lines
3.1 KiB
LLVM
96 lines
3.1 KiB
LLVM
; This test ensures that IVUsers works correctly in the legacy pass manager
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; without LCSSA and in the specific ways that some of its users (LSR) require.
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;
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; FIXME: We need some way to match the precision here in the new PM where loop
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; passes *always* work on LCSSA. This should stop using a different set of
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; checks at that point.
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; RUN: opt < %s -analyze -iv-users | FileCheck %s --check-prefixes=CHECK,CHECK-NO-LCSSA
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; RUN: opt < %s -disable-output -passes='print<ivusers>' 2>&1 | FileCheck %s
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; Provide legal integer types.
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target datalayout = "n8:16:32:64"
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; The value of %r is dependent on a polynomial iteration expression.
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;
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; CHECK-LABEL: IV Users for loop %foo.loop
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; CHECK-NO-LCSSA: {1,+,3,+,2}<%foo.loop>
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define i64 @foo(i64 %n) {
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entry:
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br label %foo.loop
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foo.loop:
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %foo.loop ]
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%indvar.next = add i64 %indvar, 1
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%c = icmp eq i64 %indvar.next, %n
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br i1 %c, label %exit, label %foo.loop
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exit:
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%r = mul i64 %indvar.next, %indvar.next
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ret i64 %r
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}
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; PR15470: LSR miscompile. The test1 function should return '1'.
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; It is valid to fold SCEVUnknown into the recurrence because it
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; was defined before the loop.
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;
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; SCEV does not know how to denormalize chained recurrences, so make
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; sure they aren't marked as post-inc users.
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;
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; CHECK-LABEL: IV Users for loop %test1.loop
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; CHECK-NO-LCSSA: %sext.us = {0,+,(16777216 + (-16777216 * %sub.us))<nuw><nsw>,+,33554432}<%test1.loop> (post-inc with loop %test1.loop) in %f = ashr i32 %sext.us, 24
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define i32 @test1(i1 %cond) {
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entry:
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%sub.us = select i1 %cond, i32 0, i32 0
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br label %test1.loop
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test1.loop:
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%inc1115.us = phi i32 [ 0, %entry ], [ %inc11.us, %test1.loop ]
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%inc11.us = add nsw i32 %inc1115.us, 1
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%cmp.us = icmp slt i32 %inc11.us, 2
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br i1 %cmp.us, label %test1.loop, label %for.end
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for.end:
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%tobool.us = icmp eq i32 %inc1115.us, 0
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%mul.us = shl i32 %inc1115.us, 24
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%sub.cond.us = sub nsw i32 %inc1115.us, %sub.us
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%sext.us = mul i32 %mul.us, %sub.cond.us
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%f = ashr i32 %sext.us, 24
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br label %exit
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exit:
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ret i32 %f
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}
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; PR15470: LSR miscompile. The test2 function should return '1'.
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; It is illegal to fold SCEVUnknown (sext.us) into the recurrence
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; because it is defined after the loop where this recurrence belongs.
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;
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; SCEV does not know how to denormalize chained recurrences, so make
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; sure they aren't marked as post-inc users.
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;
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; CHECK-LABEL: IV Users for loop %test2.loop
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; CHECK-NO-LCSSA: %sub.cond.us = ((-1 * %sub.us)<nuw><nsw> + {0,+,1}<nuw><nsw><%test2.loop>) (post-inc with loop %test2.loop) in %sext.us = mul i32 %mul.us, %sub.cond.us
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define i32 @test2() {
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entry:
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br label %test2.loop
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test2.loop:
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%inc1115.us = phi i32 [ 0, %entry ], [ %inc11.us, %test2.loop ]
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%inc11.us = add nsw i32 %inc1115.us, 1
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%cmp.us = icmp slt i32 %inc11.us, 2
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br i1 %cmp.us, label %test2.loop, label %for.end
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for.end:
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%tobool.us = icmp eq i32 %inc1115.us, 0
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%sub.us = select i1 %tobool.us, i32 0, i32 0
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%mul.us = shl i32 %inc1115.us, 24
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%sub.cond.us = sub nsw i32 %inc1115.us, %sub.us
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%sext.us = mul i32 %mul.us, %sub.cond.us
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%f = ashr i32 %sext.us, 24
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br label %exit
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exit:
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ret i32 %f
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}
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