loop-flatten-negative.ll
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; RUN: opt < %s -S -loop-flatten -debug-only=loop-flatten 2>&1 | FileCheck %s
; REQUIRES: asserts
; Every function in this file has a reason that it can't be transformed.
; CHECK-NOT: Checks all passed, doing the transformation
; Outer loop does not start at zero
define void @test_1(i32 %N, i32* nocapture %C, i32* nocapture readonly %A, i32 %scale) {
entry:
%cmp25 = icmp sgt i32 %N, 0
br i1 %cmp25, label %for.body4.lr.ph, label %for.cond.cleanup
for.body4.lr.ph:
%i.026 = phi i32 [ %inc10, %for.cond.cleanup3 ], [ 1, %entry ]
%mul = mul nsw i32 %i.026, %N
br label %for.body4
for.body4:
%j.024 = phi i32 [ 0, %for.body4.lr.ph ], [ %inc, %for.body4 ]
%add = add nsw i32 %j.024, %mul
%arrayidx = getelementptr inbounds i32, i32* %A, i32 %add
%0 = load i32, i32* %arrayidx, align 4
%mul5 = mul nsw i32 %0, %scale
%arrayidx8 = getelementptr inbounds i32, i32* %C, i32 %add
store i32 %mul5, i32* %arrayidx8, align 4
%inc = add nuw nsw i32 %j.024, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.cond.cleanup3, label %for.body4
for.cond.cleanup3:
%inc10 = add nuw nsw i32 %i.026, 1
%exitcond27 = icmp eq i32 %inc10, %N
br i1 %exitcond27, label %for.cond.cleanup, label %for.body4.lr.ph
for.cond.cleanup:
ret void
}
; Inner loop does not start at zero
define void @test_2(i32 %N, i32* nocapture %C, i32* nocapture readonly %A, i32 %scale) {
entry:
%cmp25 = icmp sgt i32 %N, 0
br i1 %cmp25, label %for.body4.lr.ph, label %for.cond.cleanup
for.body4.lr.ph:
%i.026 = phi i32 [ %inc10, %for.cond.cleanup3 ], [ 0, %entry ]
%mul = mul nsw i32 %i.026, %N
br label %for.body4
for.body4:
%j.024 = phi i32 [ 1, %for.body4.lr.ph ], [ %inc, %for.body4 ]
%add = add nsw i32 %j.024, %mul
%arrayidx = getelementptr inbounds i32, i32* %A, i32 %add
%0 = load i32, i32* %arrayidx, align 4
%mul5 = mul nsw i32 %0, %scale
%arrayidx8 = getelementptr inbounds i32, i32* %C, i32 %add
store i32 %mul5, i32* %arrayidx8, align 4
%inc = add nuw nsw i32 %j.024, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.cond.cleanup3, label %for.body4
for.cond.cleanup3:
%inc10 = add nuw nsw i32 %i.026, 1
%exitcond27 = icmp eq i32 %inc10, %N
br i1 %exitcond27, label %for.cond.cleanup, label %for.body4.lr.ph
for.cond.cleanup:
ret void
}
; Outer IV used directly
define hidden void @test_3(i16 zeroext %N, i32* nocapture %C, i32* nocapture readonly %A, i32 %scale) {
entry:
%conv = zext i16 %N to i32
%cmp25 = icmp eq i16 %N, 0
br i1 %cmp25, label %for.cond.cleanup, label %for.body.lr.ph.split.us
for.body.lr.ph.split.us: ; preds = %entry
br label %for.body.us
for.body.us: ; preds = %for.cond2.for.cond.cleanup6_crit_edge.us, %for.body.lr.ph.split.us
%i.026.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc12.us, %for.cond2.for.cond.cleanup6_crit_edge.us ]
%arrayidx.us = getelementptr inbounds i32, i32* %A, i32 %i.026.us
%mul9.us = mul nuw nsw i32 %i.026.us, %conv
br label %for.body7.us
for.body7.us: ; preds = %for.body.us, %for.body7.us
%j.024.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %for.body7.us ]
%0 = load i32, i32* %arrayidx.us, align 4
%mul.us = mul nsw i32 %0, %scale
%add.us = add nuw nsw i32 %j.024.us, %mul9.us
%arrayidx10.us = getelementptr inbounds i32, i32* %C, i32 %add.us
store i32 %mul.us, i32* %arrayidx10.us, align 4
%inc.us = add nuw nsw i32 %j.024.us, 1
%exitcond = icmp ne i32 %inc.us, %conv
br i1 %exitcond, label %for.body7.us, label %for.cond2.for.cond.cleanup6_crit_edge.us
for.cond2.for.cond.cleanup6_crit_edge.us: ; preds = %for.body7.us
%inc12.us = add nuw nsw i32 %i.026.us, 1
%exitcond27 = icmp ne i32 %inc12.us, %conv
br i1 %exitcond27, label %for.body.us, label %for.cond.cleanup.loopexit
for.cond.cleanup.loopexit: ; preds = %for.cond2.for.cond.cleanup6_crit_edge.us
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
}
; Inner IV used directly
define hidden void @test_4(i16 zeroext %N, i32* nocapture %C, i32* nocapture readonly %A, i32 %scale) {
entry:
%conv = zext i16 %N to i32
%cmp25 = icmp eq i16 %N, 0
br i1 %cmp25, label %for.cond.cleanup, label %for.body.lr.ph.split.us
for.body.lr.ph.split.us: ; preds = %entry
br label %for.body.us
for.body.us: ; preds = %for.cond2.for.cond.cleanup6_crit_edge.us, %for.body.lr.ph.split.us
%i.026.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc12.us, %for.cond2.for.cond.cleanup6_crit_edge.us ]
%mul9.us = mul nuw nsw i32 %i.026.us, %conv
br label %for.body7.us
for.body7.us: ; preds = %for.body.us, %for.body7.us
%j.024.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %for.body7.us ]
%arrayidx.us = getelementptr inbounds i32, i32* %A, i32 %j.024.us
%0 = load i32, i32* %arrayidx.us, align 4
%mul.us = mul nsw i32 %0, %scale
%add.us = add nuw nsw i32 %j.024.us, %mul9.us
%arrayidx10.us = getelementptr inbounds i32, i32* %C, i32 %add.us
store i32 %mul.us, i32* %arrayidx10.us, align 4
%inc.us = add nuw nsw i32 %j.024.us, 1
%exitcond = icmp ne i32 %inc.us, %conv
br i1 %exitcond, label %for.body7.us, label %for.cond2.for.cond.cleanup6_crit_edge.us
for.cond2.for.cond.cleanup6_crit_edge.us: ; preds = %for.body7.us
%inc12.us = add nuw nsw i32 %i.026.us, 1
%exitcond27 = icmp ne i32 %inc12.us, %conv
br i1 %exitcond27, label %for.body.us, label %for.cond.cleanup.loopexit
for.cond.cleanup.loopexit: ; preds = %for.cond2.for.cond.cleanup6_crit_edge.us
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
}
; Inner iteration count not invariant in outer loop
declare i32 @get_int() readonly
define void @test_5(i16 zeroext %N, i32* nocapture %C, i32* nocapture readonly %A, i32 %scale) {
entry:
%conv = zext i16 %N to i32
%cmp27 = icmp eq i16 %N, 0
br i1 %cmp27, label %for.cond.cleanup, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.cond.cleanup5
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
for.body: ; preds = %for.body.lr.ph, %for.cond.cleanup5
%i.028 = phi i32 [ 0, %for.body.lr.ph ], [ %inc12, %for.cond.cleanup5 ]
%call = tail call i32 @get_int()
%cmp325 = icmp sgt i32 %call, 0
br i1 %cmp325, label %for.body6.lr.ph, label %for.cond.cleanup5
for.body6.lr.ph: ; preds = %for.body
%mul = mul nsw i32 %call, %i.028
br label %for.body6
for.cond.cleanup5.loopexit: ; preds = %for.body6
br label %for.cond.cleanup5
for.cond.cleanup5: ; preds = %for.cond.cleanup5.loopexit, %for.body
%inc12 = add nuw nsw i32 %i.028, 1
%exitcond29 = icmp ne i32 %inc12, %conv
br i1 %exitcond29, label %for.body, label %for.cond.cleanup.loopexit
for.body6: ; preds = %for.body6.lr.ph, %for.body6
%j.026 = phi i32 [ 0, %for.body6.lr.ph ], [ %inc, %for.body6 ]
%add = add nsw i32 %j.026, %mul
%arrayidx = getelementptr inbounds i32, i32* %A, i32 %add
%0 = load i32, i32* %arrayidx, align 4
%mul7 = mul nsw i32 %0, %scale
%arrayidx10 = getelementptr inbounds i32, i32* %C, i32 %add
store i32 %mul7, i32* %arrayidx10, align 4
%inc = add nuw nsw i32 %j.026, 1
%exitcond = icmp ne i32 %inc, %call
br i1 %exitcond, label %for.body6, label %for.cond.cleanup5.loopexit
}
; Inner loop has an early exit
define hidden void @test_6(i16 zeroext %N, i32* nocapture %C, i32* nocapture readonly %A, i32 %scale) {
entry:
%conv = zext i16 %N to i32
%cmp39 = icmp eq i16 %N, 0
br i1 %cmp39, label %for.cond.cleanup, label %for.body.us.preheader
for.body.us.preheader: ; preds = %entry
br label %for.body.us
for.body.us: ; preds = %for.body.us.preheader, %cleanup.us
%i.040.us = phi i32 [ %inc19.us, %cleanup.us ], [ 0, %for.body.us.preheader ]
%mul.us = mul nuw nsw i32 %i.040.us, %conv
br label %for.body7.us
for.body7.us: ; preds = %for.body.us, %if.end.us
%j.038.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %if.end.us ]
%add.us = add nuw nsw i32 %j.038.us, %mul.us
%arrayidx.us = getelementptr inbounds i32, i32* %A, i32 %add.us
%0 = load i32, i32* %arrayidx.us, align 4
%tobool.us = icmp eq i32 %0, 0
br i1 %tobool.us, label %if.end.us, label %cleanup.us
cleanup.us: ; preds = %if.end.us, %for.body7.us
%inc19.us = add nuw nsw i32 %i.040.us, 1
%exitcond = icmp eq i32 %inc19.us, %conv
br i1 %exitcond, label %for.cond.cleanup, label %for.body.us
if.end.us: ; preds = %for.body7.us
%arrayidx17.us = getelementptr inbounds i32, i32* %C, i32 %add.us
store i32 0, i32* %arrayidx17.us, align 4
%inc.us = add nuw nsw i32 %j.038.us, 1
%cmp4.us = icmp ult i32 %inc.us, %conv
br i1 %cmp4.us, label %for.body7.us, label %cleanup.us
for.cond.cleanup: ; preds = %cleanup.us, %entry
ret void
}
define hidden void @test_7(i16 zeroext %N, i32* nocapture %C, i32* nocapture readonly %A, i32 %scale) {
entry:
%conv = zext i16 %N to i32
%cmp30 = icmp eq i16 %N, 0
br i1 %cmp30, label %cleanup, label %for.body.us.preheader
for.body.us.preheader: ; preds = %entry
br label %for.body.us
for.body.us: ; preds = %for.body.us.preheader, %for.cond2.for.cond.cleanup6_crit_edge.us
%i.031.us = phi i32 [ %inc15.us, %for.cond2.for.cond.cleanup6_crit_edge.us ], [ 0, %for.body.us.preheader ]
%call.us = tail call i32 @get_int() #2
%tobool.us = icmp eq i32 %call.us, 0
br i1 %tobool.us, label %for.body7.lr.ph.us, label %cleanup
for.body7.us: ; preds = %for.body7.us, %for.body7.lr.ph.us
%j.029.us = phi i32 [ 0, %for.body7.lr.ph.us ], [ %inc.us, %for.body7.us ]
%add.us = add nuw nsw i32 %j.029.us, %mul.us
%arrayidx.us = getelementptr inbounds i32, i32* %A, i32 %add.us
%0 = load i32, i32* %arrayidx.us, align 4
%mul9.us = mul nsw i32 %0, %scale
%arrayidx13.us = getelementptr inbounds i32, i32* %C, i32 %add.us
store i32 %mul9.us, i32* %arrayidx13.us, align 4
%inc.us = add nuw nsw i32 %j.029.us, 1
%exitcond = icmp eq i32 %inc.us, %conv
br i1 %exitcond, label %for.cond2.for.cond.cleanup6_crit_edge.us, label %for.body7.us
for.body7.lr.ph.us: ; preds = %for.body.us
%mul.us = mul nuw nsw i32 %i.031.us, %conv
br label %for.body7.us
for.cond2.for.cond.cleanup6_crit_edge.us: ; preds = %for.body7.us
%inc15.us = add nuw nsw i32 %i.031.us, 1
%cmp.us = icmp ult i32 %inc15.us, %conv
br i1 %cmp.us, label %for.body.us, label %cleanup
cleanup: ; preds = %for.cond2.for.cond.cleanup6_crit_edge.us, %for.body.us, %entry
ret void
}
; Step is not 1
define i32 @test_8(i32 %val, i16* nocapture %A) {
entry:
br label %for.body
for.body: ; preds = %entry, %for.inc6
%i.018 = phi i32 [ 0, %entry ], [ %inc7, %for.inc6 ]
%mul = mul nuw nsw i32 %i.018, 20
br label %for.body3
for.body3: ; preds = %for.body, %for.body3
%j.017 = phi i32 [ 0, %for.body ], [ %inc, %for.body3 ]
%add = add nuw nsw i32 %j.017, %mul
%arrayidx = getelementptr inbounds i16, i16* %A, i32 %add
%0 = load i16, i16* %arrayidx, align 2
%conv16 = zext i16 %0 to i32
%add4 = add i32 %conv16, %val
%conv5 = trunc i32 %add4 to i16
store i16 %conv5, i16* %arrayidx, align 2
%inc = add nuw nsw i32 %j.017, 1
%exitcond = icmp ne i32 %inc, 20
br i1 %exitcond, label %for.body3, label %for.inc6
for.inc6: ; preds = %for.body3
%inc7 = add nuw nsw i32 %i.018, 2
%exitcond19 = icmp ne i32 %inc7, 10
br i1 %exitcond19, label %for.body, label %for.end8
for.end8: ; preds = %for.inc6
ret i32 10
}
; Step is not 1
define i32 @test_9(i32 %val, i16* nocapture %A) {
entry:
br label %for.body
for.body: ; preds = %entry, %for.inc6
%i.018 = phi i32 [ 0, %entry ], [ %inc7, %for.inc6 ]
%mul = mul nuw nsw i32 %i.018, 20
br label %for.body3
for.body3: ; preds = %for.body, %for.body3
%j.017 = phi i32 [ 0, %for.body ], [ %inc, %for.body3 ]
%add = add nuw nsw i32 %j.017, %mul
%arrayidx = getelementptr inbounds i16, i16* %A, i32 %add
%0 = load i16, i16* %arrayidx, align 2
%conv16 = zext i16 %0 to i32
%add4 = add i32 %conv16, %val
%conv5 = trunc i32 %add4 to i16
store i16 %conv5, i16* %arrayidx, align 2
%inc = add nuw nsw i32 %j.017, 2
%exitcond = icmp ne i32 %inc, 20
br i1 %exitcond, label %for.body3, label %for.inc6
for.inc6: ; preds = %for.body3
%inc7 = add nuw nsw i32 %i.018, 1
%exitcond19 = icmp ne i32 %inc7, 10
br i1 %exitcond19, label %for.body, label %for.end8
for.end8: ; preds = %for.inc6
ret i32 10
}
; Outer loop conditional phi
define i32 @e() {
entry:
br label %for.body
for.body: ; preds = %entry, %for.end16
%f.033 = phi i32 [ 0, %entry ], [ %inc18, %for.end16 ]
%g.032 = phi i32 [ undef, %entry ], [ %g.3.lcssa, %for.end16 ]
%.pr = add i32 10, 10
%tobool29 = icmp eq i32 %.pr, 0
br i1 %tobool29, label %for.end, label %for.body2.lr.ph
for.body2.lr.ph: ; preds = %for.body
br label %for.cond1.for.end_crit_edge
for.cond1.for.end_crit_edge: ; preds = %for.body2.lr.ph
br label %for.end
for.end: ; preds = %for.cond1.for.end_crit_edge, %for.body
%g.1.lcssa = phi i32 [ 0, %for.cond1.for.end_crit_edge ], [ %g.032, %for.body ]
br label %for.body5
for.body5: ; preds = %for.end, %lor.end
%i.031 = phi i32 [ 0, %for.end ], [ %inc15, %lor.end ]
%g.230 = phi i32 [ %g.1.lcssa, %for.end ], [ %g.3, %lor.end ]
%0 = add i32 10, 10
%1 = add i32 10, 10
%tobool9 = icmp eq i32 %1, 0
br i1 %tobool9, label %lor.rhs, label %lor.end
lor.rhs: ; preds = %for.body5
%2 = add i32 10, 10
%call11 = add i32 10, 10
%tobool12 = icmp ne i32 %call11, 0
br label %lor.end
lor.end: ; preds = %for.body5, %lor.rhs
%g.3 = phi i32 [ %g.230, %for.body5 ], [ %call11, %lor.rhs ]
%3 = phi i1 [ true, %for.body5 ], [ %tobool12, %lor.rhs ]
%lor.ext = zext i1 %3 to i32
%inc15 = add nuw nsw i32 %i.031, 1
%exitcond = icmp ne i32 %inc15, 9
br i1 %exitcond, label %for.body5, label %for.end16
for.end16: ; preds = %lor.end
%g.3.lcssa = phi i32 [ %g.3, %lor.end ]
%inc18 = add nuw nsw i32 %f.033, 1
%exitcond34 = icmp ne i32 %inc18, 7
br i1 %exitcond34, label %for.body, label %for.end19
for.end19: ; preds = %for.end16
ret i32 undef
}