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loop-flatten.ll
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; RUN: opt < %s -S -loop-flatten -verify-loop-info -verify-dom-info -verify-scev -verify | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
; CHECK-LABEL: test1
; Simple loop where the IV's is constant
define i32 @test1(i32 %val, i16* nocapture %A) {
entry:
br label %for.body
; CHECK: entry:
; CHECK: %flatten.tripcount = mul i32 20, 10
; CHECK: 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
; CHECK: for.body:
; CHECK: %i.018 = phi i32 [ 0, %entry ], [ %inc7, %for.inc6 ]
; CHECK: %mul = mul nuw nsw i32 %i.018, 20
; CHECK: 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
; CHECK: for.body3:
; CHECK: %j.017 = phi i32 [ 0, %for.body ]
; CHECK: %add = add nuw nsw i32 %j.017, %mul
; CHECK: %arrayidx = getelementptr inbounds i16, i16* %A, i32 %i.018
; CHECK: %0 = load i16, i16* %arrayidx, align 2
; CHECK: %conv16 = zext i16 %0 to i32
; CHECK: %add4 = add i32 %conv16, %val
; CHECK: %conv5 = trunc i32 %add4 to i16
; CHECK: store i16 %conv5, i16* %arrayidx, align 2
; CHECK: %inc = add nuw nsw i32 %j.017, 1
; CHECK: %exitcond = icmp ne i32 %inc, 20
; CHECK: br 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
; CHECK: for.inc6:
; CHECK: %inc7 = add nuw nsw i32 %i.018, 1
; CHECK: %exitcond19 = icmp ne i32 %inc7, %flatten.tripcount
; CHECK: br i1 %exitcond19, label %for.body, label %for.end8
for.end8: ; preds = %for.inc6
ret i32 10
}
; CHECK-LABEL: test2
; Same as above but non constant IV (which still cannot overflow)
define i32 @test2(i8 zeroext %I, i32 %val, i16* nocapture %A) {
entry:
%conv = zext i8 %I to i32
%cmp26 = icmp eq i8 %I, 0
br i1 %cmp26, label %for.end13, label %for.body.lr.ph.split.us
for.body.lr.ph.split.us: ; preds = %entry
br label %for.body.us
; CHECK: for.body.lr.ph.split.us:
; CHECK: %flatten.tripcount = mul i32 %conv, %conv
; CHECK: br label %for.body.us
for.body.us: ; preds = %for.cond2.for.inc11_crit_edge.us, %for.body.lr.ph.split.us
%i.027.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc12.us, %for.cond2.for.inc11_crit_edge.us ]
%mul.us = mul nuw nsw i32 %i.027.us, %conv
br label %for.body6.us
; CHECK: for.body.us:
; CHECK: %i.027.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc12.us, %for.cond2.for.inc11_crit_edge.us ]
; CHECK: %mul.us = mul nuw nsw i32 %i.027.us, %conv
; CHECK: br label %for.body6.us
for.body6.us: ; preds = %for.body.us, %for.body6.us
%j.025.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %for.body6.us ]
%add.us = add nuw nsw i32 %j.025.us, %mul.us
%arrayidx.us = getelementptr inbounds i16, i16* %A, i32 %add.us
%0 = load i16, i16* %arrayidx.us, align 2
%conv823.us = zext i16 %0 to i32
%add9.us = add i32 %conv823.us, %val
%conv10.us = trunc i32 %add9.us to i16
store i16 %conv10.us, i16* %arrayidx.us, align 2
%inc.us = add nuw nsw i32 %j.025.us, 1
%exitcond = icmp ne i32 %inc.us, %conv
br i1 %exitcond, label %for.body6.us, label %for.cond2.for.inc11_crit_edge.us
; CHECK: for.body6.us:
; CHECK: %j.025.us = phi i32 [ 0, %for.body.us ]
; CHECK: %add.us = add nuw nsw i32 %j.025.us, %mul.us
; CHECK: %arrayidx.us = getelementptr inbounds i16, i16* %A, i32 %i.027.us
; CHECK: %0 = load i16, i16* %arrayidx.us, align 2
; CHECK: %conv823.us = zext i16 %0 to i32
; CHECK: %add9.us = add i32 %conv823.us, %val
; CHECK: %conv10.us = trunc i32 %add9.us to i16
; CHECK: store i16 %conv10.us, i16* %arrayidx.us, align 2
; CHECK: %inc.us = add nuw nsw i32 %j.025.us, 1
; CHECK: %exitcond = icmp ne i32 %inc.us, %conv
; CHECK: br label %for.cond2.for.inc11_crit_edge.us
for.cond2.for.inc11_crit_edge.us: ; preds = %for.body6.us
%inc12.us = add nuw nsw i32 %i.027.us, 1
%exitcond28 = icmp ne i32 %inc12.us, %conv
br i1 %exitcond28, label %for.body.us, label %for.end13.loopexit
; CHECK: for.cond2.for.inc11_crit_edge.us: ; preds = %for.body6.us
; CHECK: %inc12.us = add nuw nsw i32 %i.027.us, 1
; CHECK: %exitcond28 = icmp ne i32 %inc12.us, %flatten.tripcount
; CHECK: br i1 %exitcond28, label %for.body.us, label %for.end13.loopexit
for.end13.loopexit: ; preds = %for.cond2.for.inc11_crit_edge.us
br label %for.end13
for.end13: ; preds = %for.end13.loopexit, %entry
%i.0.lcssa = phi i32 [ 0, %entry ], [ %conv, %for.end13.loopexit ]
ret i32 %i.0.lcssa
}
; CHECK-LABEL: test3
; Same as above, uses load to determine it can't overflow
define i32 @test3(i32 %N, i32 %val, i16* nocapture %A) local_unnamed_addr #0 {
entry:
%cmp21 = icmp eq i32 %N, 0
br i1 %cmp21, label %for.end8, label %for.body.lr.ph.split.us
for.body.lr.ph.split.us: ; preds = %entry
br label %for.body.us
; CHECK: for.body.lr.ph.split.us:
; CHECK: %flatten.tripcount = mul i32 %N, %N
; CHECK: br label %for.body.us
for.body.us: ; preds = %for.cond1.for.inc6_crit_edge.us, %for.body.lr.ph.split.us
%i.022.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc7.us, %for.cond1.for.inc6_crit_edge.us ]
%mul.us = mul i32 %i.022.us, %N
br label %for.body3.us
; CHECK: for.body.us:
; CHECK: %i.022.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc7.us, %for.cond1.for.inc6_crit_edge.us ]
; CHECK: %mul.us = mul i32 %i.022.us, %N
; CHECK: br label %for.body3.us
for.body3.us: ; preds = %for.body.us, %for.body3.us
%j.020.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %for.body3.us ]
%add.us = add i32 %j.020.us, %mul.us
%arrayidx.us = getelementptr inbounds i16, i16* %A, i32 %add.us
%0 = load i16, i16* %arrayidx.us, align 2
%conv18.us = zext i16 %0 to i32
%add4.us = add i32 %conv18.us, %val
%conv5.us = trunc i32 %add4.us to i16
store i16 %conv5.us, i16* %arrayidx.us, align 2
%inc.us = add nuw i32 %j.020.us, 1
%exitcond = icmp ne i32 %inc.us, %N
br i1 %exitcond, label %for.body3.us, label %for.cond1.for.inc6_crit_edge.us
; CHECK: for.body3.us:
; CHECK: %j.020.us = phi i32 [ 0, %for.body.us ]
; CHECK: %add.us = add i32 %j.020.us, %mul.us
; CHECK: %arrayidx.us = getelementptr inbounds i16, i16* %A, i32 %i.022.us
; CHECK: %0 = load i16, i16* %arrayidx.us, align 2
; CHECK: %conv18.us = zext i16 %0 to i32
; CHECK: %add4.us = add i32 %conv18.us, %val
; CHECK: %conv5.us = trunc i32 %add4.us to i16
; CHECK: store i16 %conv5.us, i16* %arrayidx.us, align 2
; CHECK: %inc.us = add nuw i32 %j.020.us, 1
; CHECK: %exitcond = icmp ne i32 %inc.us, %N
; CHECK: br label %for.cond1.for.inc6_crit_edge.us
for.cond1.for.inc6_crit_edge.us: ; preds = %for.body3.us
%inc7.us = add nuw i32 %i.022.us, 1
%exitcond23 = icmp ne i32 %inc7.us, %N
br i1 %exitcond23, label %for.body.us, label %for.end8.loopexit
; CHECK: for.cond1.for.inc6_crit_edge.us:
; CHECK: %inc7.us = add nuw i32 %i.022.us, 1
; CHECK: %exitcond23 = icmp ne i32 %inc7.us, %flatten.tripcount
; CHECK: br i1 %exitcond23, label %for.body.us, label %for.end8.loopexit
for.end8.loopexit: ; preds = %for.cond1.for.inc6_crit_edge.us
br label %for.end8
for.end8: ; preds = %for.end8.loopexit, %entry
%i.0.lcssa = phi i32 [ 0, %entry ], [ %N, %for.end8.loopexit ]
ret i32 %i.0.lcssa
}
; CHECK-LABEL: test4
; Multiplication cannot overflow, so we can replace the original loop.
define void @test4(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 %for.cond.cleanup, label %for.body.lr.ph.split.us
; CHECK: entry:
; CHECK: %[[LIMIT:.*]] = zext i16 %N to i32
; CHECK: br i1 %{{.*}} label %for.cond.cleanup, label %for.body.lr.ph.split.us
for.body.lr.ph.split.us: ; preds = %entry
br label %for.body.us
; CHECK: for.body.lr.ph.split.us:
; CHECK: %[[TRIPCOUNT:.*]] = mul i32 %[[LIMIT]], %[[LIMIT]]
; CHECK: br label %for.body.us
for.body.us: ; preds = %for.cond2.for.cond.cleanup6_crit_edge.us, %for.body.lr.ph.split.us
%i.031.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc15.us, %for.cond2.for.cond.cleanup6_crit_edge.us ]
%mul.us = mul nuw nsw i32 %i.031.us, %conv
br label %for.body7.us
; CHECK: for.body.us:
; CHECK: %[[OUTER_IV:.*]] = phi i32
; CHECK: br label %for.body7.us
for.body7.us: ; preds = %for.body.us, %for.body7.us
; CHECK: for.body7.us:
%j.029.us = phi i32 [ 0, %for.body.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
; CHECK: getelementptr inbounds i32, i32* %A, i32 %[[OUTER_IV]]
%0 = load i32, i32* %arrayidx.us, align 4
%mul9.us = mul nsw i32 %0, %scale
; CHECK: getelementptr inbounds i32, i32* %C, i32 %[[OUTER_IV]]
%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 ne i32 %inc.us, %conv
br i1 %exitcond, label %for.body7.us, label %for.cond2.for.cond.cleanup6_crit_edge.us
; CHECK: br label %for.cond2.for.cond.cleanup6_crit_edge.us
for.cond2.for.cond.cleanup6_crit_edge.us: ; preds = %for.body7.us
%inc15.us = add nuw nsw i32 %i.031.us, 1
%exitcond32 = icmp ne i32 %inc15.us, %conv
br i1 %exitcond32, label %for.body.us, label %for.cond.cleanup.loopexit
; CHECK: for.cond2.for.cond.cleanup6_crit_edge.us:
; CHECK: br i1 %exitcond32, 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
; CHECK: for.cond.cleanup.loopexit:
; CHECK: br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
ret void
; CHECK: for.cond.cleanup:
; CHECK: ret void
}
; CHECK-LABEL: test5
define i32 @test5(i8 zeroext %I, i16 zeroext %J) {
entry:
%0 = lshr i8 %I, 1
%div = zext i8 %0 to i32
%cmp30 = icmp eq i8 %0, 0
br i1 %cmp30, label %for.cond.cleanup, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
%1 = lshr i16 %J, 1
%div5 = zext i16 %1 to i32
%cmp627 = icmp eq i16 %1, 0
br i1 %cmp627, label %for.body.lr.ph.split, label %for.body.lr.ph.split.us
for.body.lr.ph.split.us: ; preds = %for.body.lr.ph
br label %for.body.us
; CHECK: for.body.lr.ph.split.us:
; CHECK: %flatten.tripcount = mul i32 %div5, %div
; CHECK: br label %for.body.us
for.body.us: ; preds = %for.cond3.for.cond.cleanup8_crit_edge.us, %for.body.lr.ph.split.us
%i.032.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc13.us, %for.cond3.for.cond.cleanup8_crit_edge.us ]
%x.031.us = phi i32 [ 1, %for.body.lr.ph.split.us ], [ %xor.us.lcssa, %for.cond3.for.cond.cleanup8_crit_edge.us ]
br label %for.body9.us
; CHECK: for.body.us:
; CHECK: %i.032.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc13.us, %for.cond3.for.cond.cleanup8_crit_edge.us ]
; CHECK: %x.031.us = phi i32 [ 1, %for.body.lr.ph.split.us ], [ %xor.us.lcssa, %for.cond3.for.cond.cleanup8_crit_edge.us ]
; CHECK: br label %for.body9.us
for.body9.us: ; preds = %for.body.us, %for.body9.us
%j.029.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %for.body9.us ]
%x.128.us = phi i32 [ %x.031.us, %for.body.us ], [ %xor.us, %for.body9.us ]
%call.us = tail call i32 @func(i32 1)
%sub.us = sub nsw i32 %call.us, %x.128.us
%xor.us = xor i32 %sub.us, %x.128.us
%inc.us = add nuw nsw i32 %j.029.us, 1
%cmp6.us = icmp ult i32 %inc.us, %div5
br i1 %cmp6.us, label %for.body9.us, label %for.cond3.for.cond.cleanup8_crit_edge.us
; CHECK: for.body9.us:
; CHECK: %j.029.us = phi i32 [ 0, %for.body.us ]
; CHECK: %x.128.us = phi i32 [ %x.031.us, %for.body.us ]
; CHECK: %call.us = tail call i32 @func(i32 1)
; CHECK: %sub.us = sub nsw i32 %call.us, %x.128.us
; CHECK: %xor.us = xor i32 %sub.us, %x.128.us
; CHECK: %inc.us = add nuw nsw i32 %j.029.us, 1
; CHECK: %cmp6.us = icmp ult i32 %inc.us, %div5
; CHECK: br label %for.cond3.for.cond.cleanup8_crit_edge.us
for.cond3.for.cond.cleanup8_crit_edge.us: ; preds = %for.body9.us
%xor.us.lcssa = phi i32 [ %xor.us, %for.body9.us ]
%inc13.us = add nuw nsw i32 %i.032.us, 1
%cmp.us = icmp ult i32 %inc13.us, %div
br i1 %cmp.us, label %for.body.us, label %for.cond.cleanup.loopexit
; CHECK: for.cond3.for.cond.cleanup8_crit_edge.us:
; CHECK: %xor.us.lcssa = phi i32 [ %xor.us, %for.body9.us ]
; CHECK: %inc13.us = add nuw nsw i32 %i.032.us, 1
; CHECK: %cmp.us = icmp ult i32 %inc13.us, %flatten.tripcount
; CHECK: br i1 %cmp.us, label %for.body.us, label %for.cond.cleanup.loopexit
for.body.lr.ph.split: ; preds = %for.body.lr.ph
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.cond3.for.cond.cleanup8_crit_edge.us
%xor.us.lcssa.lcssa = phi i32 [ %xor.us.lcssa, %for.cond3.for.cond.cleanup8_crit_edge.us ]
br label %for.cond.cleanup
for.cond.cleanup.loopexit34: ; preds = %for.body
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit34, %for.cond.cleanup.loopexit, %entry
%x.0.lcssa = phi i32 [ 1, %entry ], [ %xor.us.lcssa.lcssa, %for.cond.cleanup.loopexit ], [ 1, %for.cond.cleanup.loopexit34 ]
ret i32 %x.0.lcssa
for.body: ; preds = %for.body.lr.ph.split, %for.body
%i.032 = phi i32 [ 0, %for.body.lr.ph.split ], [ %inc13, %for.body ]
%inc13 = add nuw nsw i32 %i.032, 1
%cmp = icmp ult i32 %inc13, %div
br i1 %cmp, label %for.body, label %for.cond.cleanup.loopexit34
}
; CHECK-LABEL: test6
define i32 @test6(i8 zeroext %I, i16 zeroext %J) {
entry:
%0 = lshr i8 %I, 1
%div = zext i8 %0 to i32
%cmp30 = icmp eq i8 %0, 0
br i1 %cmp30, label %for.cond.cleanup, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
%1 = lshr i16 %J, 1
%div5 = zext i16 %1 to i32
%cmp627 = icmp eq i16 %1, 0
br i1 %cmp627, label %for.body.lr.ph.split, label %for.body.lr.ph.split.us
for.body.lr.ph.split.us: ; preds = %for.body.lr.ph
br label %for.body.us
; CHECK: for.body.lr.ph.split.us:
; CHECK: %flatten.tripcount = mul i32 %div5, %div
; CHECK: br label %for.body.us
for.body.us: ; preds = %for.cond3.for.cond.cleanup8_crit_edge.us, %for.body.lr.ph.split.us
%i.032.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc13.us, %for.cond3.for.cond.cleanup8_crit_edge.us ]
%x.031.us = phi i32 [ 1, %for.body.lr.ph.split.us ], [ %xor.us.lcssa, %for.cond3.for.cond.cleanup8_crit_edge.us ]
%mul.us = mul nuw nsw i32 %i.032.us, %div5
br label %for.body9.us
; CHECK: for.body.us:
; CHECK: %i.032.us = phi i32 [ 0, %for.body.lr.ph.split.us ], [ %inc13.us, %for.cond3.for.cond.cleanup8_crit_edge.us ]
; CHECK: %x.031.us = phi i32 [ 1, %for.body.lr.ph.split.us ], [ %xor.us.lcssa, %for.cond3.for.cond.cleanup8_crit_edge.us ]
; CHECK: %mul.us = mul nuw nsw i32 %i.032.us, %div5
; CHECK: br label %for.body9.us
for.body9.us: ; preds = %for.body.us, %for.body9.us
%j.029.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %for.body9.us ]
%x.128.us = phi i32 [ %x.031.us, %for.body.us ], [ %xor.us, %for.body9.us ]
%add.us = add nuw nsw i32 %j.029.us, %mul.us
%call.us = tail call i32 @func(i32 %add.us)
%sub.us = sub nsw i32 %call.us, %x.128.us
%xor.us = xor i32 %sub.us, %x.128.us
%inc.us = add nuw nsw i32 %j.029.us, 1
%cmp6.us = icmp ult i32 %inc.us, %div5
br i1 %cmp6.us, label %for.body9.us, label %for.cond3.for.cond.cleanup8_crit_edge.us
; CHECK: for.body9.us:
; CHECK: %j.029.us = phi i32 [ 0, %for.body.us ]
; CHECK: %x.128.us = phi i32 [ %x.031.us, %for.body.us ]
; CHECK: %add.us = add nuw nsw i32 %j.029.us, %mul.us
; CHECK: %call.us = tail call i32 @func(i32 %i.032.us)
; CHECK: %sub.us = sub nsw i32 %call.us, %x.128.us
; CHECK: %xor.us = xor i32 %sub.us, %x.128.us
; CHECK: %inc.us = add nuw nsw i32 %j.029.us, 1
; CHECK: %cmp6.us = icmp ult i32 %inc.us, %div5
; CHECK: br label %for.cond3.for.cond.cleanup8_crit_edge.us
for.cond3.for.cond.cleanup8_crit_edge.us: ; preds = %for.body9.us
%xor.us.lcssa = phi i32 [ %xor.us, %for.body9.us ]
%inc13.us = add nuw nsw i32 %i.032.us, 1
%cmp.us = icmp ult i32 %inc13.us, %div
br i1 %cmp.us, label %for.body.us, label %for.cond.cleanup.loopexit
; CHECK: for.cond3.for.cond.cleanup8_crit_edge.us:
; CHECK: %xor.us.lcssa = phi i32 [ %xor.us, %for.body9.us ]
; CHECK: %inc13.us = add nuw nsw i32 %i.032.us, 1
; CHECK: %cmp.us = icmp ult i32 %inc13.us, %flatten.tripcount
; CHECK: br i1 %cmp.us, label %for.body.us, label %for.cond.cleanup.loopexit
for.body.lr.ph.split: ; preds = %for.body.lr.ph
br label %for.body
for.cond.cleanup.loopexit: ; preds = %for.cond3.for.cond.cleanup8_crit_edge.us
%xor.us.lcssa.lcssa = phi i32 [ %xor.us.lcssa, %for.cond3.for.cond.cleanup8_crit_edge.us ]
br label %for.cond.cleanup
for.cond.cleanup.loopexit34: ; preds = %for.body
br label %for.cond.cleanup
for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit34, %for.cond.cleanup.loopexit, %entry
%x.0.lcssa = phi i32 [ 1, %entry ], [ %xor.us.lcssa.lcssa, %for.cond.cleanup.loopexit ], [ 1, %for.cond.cleanup.loopexit34 ]
ret i32 %x.0.lcssa
for.body: ; preds = %for.body.lr.ph.split, %for.body
%i.032 = phi i32 [ 0, %for.body.lr.ph.split ], [ %inc13, %for.body ]
%inc13 = add nuw nsw i32 %i.032, 1
%cmp = icmp ult i32 %inc13, %div
br i1 %cmp, label %for.body, label %for.cond.cleanup.loopexit34
}
; CHECK-LABEL: test7
; Various inner phis and conditions which we can still work with
define signext i16 @test7(i32 %I, i32 %J, i32* nocapture readonly %C, i16 signext %limit) {
entry:
%cmp43 = icmp eq i32 %J, 0
br i1 %cmp43, label %for.end17, label %for.body.lr.ph
for.body.lr.ph: ; preds = %entry
%conv = sext i16 %limit to i32
br label %for.body.us
; CHECK: for.body.lr.ph:
; CHECK: %conv = sext i16 %limit to i32
; CHECK: %flatten.tripcount = mul i32 %J, %J
; CHECK: br label %for.body.us
for.body.us: ; preds = %for.cond1.for.inc15_crit_edge.us, %for.body.lr.ph
%i.047.us = phi i32 [ 0, %for.body.lr.ph ], [ %inc16.us, %for.cond1.for.inc15_crit_edge.us ]
%ret.046.us = phi i16 [ 0, %for.body.lr.ph ], [ %ret.2.us.lcssa, %for.cond1.for.inc15_crit_edge.us ]
%prev.045.us = phi i32 [ 0, %for.body.lr.ph ], [ %.lcssa, %for.cond1.for.inc15_crit_edge.us ]
%tmp.044.us = phi i32 [ 0, %for.body.lr.ph ], [ %tmp.2.us.lcssa, %for.cond1.for.inc15_crit_edge.us ]
%mul.us = mul i32 %i.047.us, %J
br label %for.body3.us
; CHECK: for.body.us:
; CHECK: %i.047.us = phi i32 [ 0, %for.body.lr.ph ], [ %inc16.us, %for.cond1.for.inc15_crit_edge.us ]
; CHECK: %ret.046.us = phi i16 [ 0, %for.body.lr.ph ], [ %ret.2.us.lcssa, %for.cond1.for.inc15_crit_edge.us ]
; CHECK: %prev.045.us = phi i32 [ 0, %for.body.lr.ph ], [ %.lcssa, %for.cond1.for.inc15_crit_edge.us ]
; CHECK: %tmp.044.us = phi i32 [ 0, %for.body.lr.ph ], [ %tmp.2.us.lcssa, %for.cond1.for.inc15_crit_edge.us ]
; CHECK: %mul.us = mul i32 %i.047.us, %J
; CHECK: br label %for.body3.us
for.body3.us: ; preds = %for.body.us, %if.end.us
%j.040.us = phi i32 [ 0, %for.body.us ], [ %inc.us, %if.end.us ]
%ret.139.us = phi i16 [ %ret.046.us, %for.body.us ], [ %ret.2.us, %if.end.us ]
%prev.138.us = phi i32 [ %prev.045.us, %for.body.us ], [ %0, %if.end.us ]
%tmp.137.us = phi i32 [ %tmp.044.us, %for.body.us ], [ %tmp.2.us, %if.end.us ]
%add.us = add i32 %j.040.us, %mul.us
%arrayidx.us = getelementptr inbounds i32, i32* %C, i32 %add.us
%0 = load i32, i32* %arrayidx.us, align 4
%add4.us = add nsw i32 %0, %tmp.137.us
%cmp5.us = icmp sgt i32 %add4.us, %conv
br i1 %cmp5.us, label %if.then.us, label %if.else.us
; CHECK: for.body3.us:
; CHECK: %j.040.us = phi i32 [ 0, %for.body.us ]
; CHECK: %ret.139.us = phi i16 [ %ret.046.us, %for.body.us ]
; CHECK: %prev.138.us = phi i32 [ %prev.045.us, %for.body.us ]
; CHECK: %tmp.137.us = phi i32 [ %tmp.044.us, %for.body.us ]
; CHECK: %add.us = add i32 %j.040.us, %mul.us
; CHECK: %arrayidx.us = getelementptr inbounds i32, i32* %C, i32 %i.047.us
; CHECK: %0 = load i32, i32* %arrayidx.us, align 4
; CHECK: %add4.us = add nsw i32 %0, %tmp.137.us
; CHECK: %cmp5.us = icmp sgt i32 %add4.us, %conv
; CHECK: br i1 %cmp5.us, label %if.then.us, label %if.else.us
if.else.us: ; preds = %for.body3.us
%cmp10.us = icmp sgt i32 %0, %prev.138.us
%cond.us = zext i1 %cmp10.us to i32
%conv1235.us = zext i16 %ret.139.us to i32
%add13.us = add nuw nsw i32 %cond.us, %conv1235.us
br label %if.end.us
; CHECK: if.else.us:
; CHECK: %cmp10.us = icmp sgt i32 %0, %prev.138.us
; CHECK: %cond.us = zext i1 %cmp10.us to i32
; CHECK: %conv1235.us = zext i16 %ret.139.us to i32
; CHECK: %add13.us = add nuw nsw i32 %cond.us, %conv1235.us
; CHECK: br label %if.end.us
if.then.us: ; preds = %for.body3.us
%conv7.us = sext i16 %ret.139.us to i32
%add8.us = add nsw i32 %conv7.us, 10
br label %if.end.us
; CHECK: if.then.us:
; CHECK: %conv7.us = sext i16 %ret.139.us to i32
; CHECK: %add8.us = add nsw i32 %conv7.us, 10
; CHECK: br label %if.end.us
if.end.us: ; preds = %if.then.us, %if.else.us
%tmp.2.us = phi i32 [ 0, %if.then.us ], [ %add4.us, %if.else.us ]
%ret.2.in.us = phi i32 [ %add8.us, %if.then.us ], [ %add13.us, %if.else.us ]
%ret.2.us = trunc i32 %ret.2.in.us to i16
%inc.us = add nuw i32 %j.040.us, 1
%exitcond = icmp ne i32 %inc.us, %J
br i1 %exitcond, label %for.body3.us, label %for.cond1.for.inc15_crit_edge.us
; CHECK: if.end.us:
; CHECK: %tmp.2.us = phi i32 [ 0, %if.then.us ], [ %add4.us, %if.else.us ]
; CHECK: %ret.2.in.us = phi i32 [ %add8.us, %if.then.us ], [ %add13.us, %if.else.us ]
; CHECK: %ret.2.us = trunc i32 %ret.2.in.us to i16
; CHECK: %inc.us = add nuw i32 %j.040.us, 1
; CHECK: %exitcond = icmp ne i32 %inc.us, %J
; CHECK: br label %for.cond1.for.inc15_crit_edge.us
for.cond1.for.inc15_crit_edge.us: ; preds = %if.end.us
%tmp.2.us.lcssa = phi i32 [ %tmp.2.us, %if.end.us ]
%ret.2.us.lcssa = phi i16 [ %ret.2.us, %if.end.us ]
%.lcssa = phi i32 [ %0, %if.end.us ]
%inc16.us = add nuw i32 %i.047.us, 1
%exitcond49 = icmp ne i32 %inc16.us, %J
br i1 %exitcond49, label %for.body.us, label %for.end17.loopexit
; CHECK: for.cond1.for.inc15_crit_edge.us:
; CHECK: %tmp.2.us.lcssa = phi i32 [ %tmp.2.us, %if.end.us ]
; CHECK: %ret.2.us.lcssa = phi i16 [ %ret.2.us, %if.end.us ]
; CHECK: %.lcssa = phi i32 [ %0, %if.end.us ]
; CHECK: %inc16.us = add nuw i32 %i.047.us, 1
; CHECK: %exitcond49 = icmp ne i32 %inc16.us, %flatten.tripcount
; CHECK: br i1 %exitcond49, label %for.body.us, label %for.end17.loopexit
for.end17.loopexit: ; preds = %for.cond1.for.inc15_crit_edge.us
%ret.2.us.lcssa.lcssa = phi i16 [ %ret.2.us.lcssa, %for.cond1.for.inc15_crit_edge.us ]
br label %for.end17
for.end17: ; preds = %for.end17.loopexit, %entry
%ret.0.lcssa = phi i16 [ 0, %entry ], [ %ret.2.us.lcssa.lcssa, %for.end17.loopexit ]
ret i16 %ret.0.lcssa
}
; CHECK-LABEL: test8
; Same as test1, but with different continue block order
; (uses icmp eq and loops on false)
define i32 @test8(i32 %val, i16* nocapture %A) {
entry:
br label %for.body
; CHECK: entry:
; CHECK: %flatten.tripcount = mul i32 20, 10
; CHECK: 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
; CHECK: for.body:
; CHECK: %i.018 = phi i32 [ 0, %entry ], [ %inc7, %for.inc6 ]
; CHECK: %mul = mul nuw nsw i32 %i.018, 20
; CHECK: 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 eq i32 %inc, 20
br i1 %exitcond, label %for.inc6, label %for.body3
; CHECK: for.body3:
; CHECK: %j.017 = phi i32 [ 0, %for.body ]
; CHECK: %add = add nuw nsw i32 %j.017, %mul
; CHECK: %arrayidx = getelementptr inbounds i16, i16* %A, i32 %i.018
; CHECK: %0 = load i16, i16* %arrayidx, align 2
; CHECK: %conv16 = zext i16 %0 to i32
; CHECK: %add4 = add i32 %conv16, %val
; CHECK: %conv5 = trunc i32 %add4 to i16
; CHECK: store i16 %conv5, i16* %arrayidx, align 2
; CHECK: %inc = add nuw nsw i32 %j.017, 1
; CHECK: %exitcond = icmp eq i32 %inc, 20
; CHECK: br label %for.inc6
for.inc6: ; preds = %for.body3
%inc7 = add nuw nsw i32 %i.018, 1
%exitcond19 = icmp eq i32 %inc7, 10
br i1 %exitcond19, label %for.end8, label %for.body
; CHECK: for.inc6:
; CHECK: %inc7 = add nuw nsw i32 %i.018, 1
; CHECK: %exitcond19 = icmp eq i32 %inc7, %flatten.tripcount
; CHECK: br i1 %exitcond19, label %for.end8, label %for.body
for.end8: ; preds = %for.inc6
ret i32 10
}
; When the inner loop trip count is a constant and the step
; is 1, the InstCombine pass causes the transformation e.g.
; icmp ult i32 %inc, 20 -> icmp ult i32 %j, 19. This doesn't
; match the pattern (OuterPHI * InnerTripCount) + InnerPHI but
; we should still flatten the loop as the compare is removed
; later anyway.
define i32 @test9(i32* nocapture %A) {
entry:
br label %for.cond1.preheader
; CHECK-LABEL: test9
; CHECK: entry:
; CHECK: %flatten.tripcount = mul i32 20, 11
; CHECK: br label %for.cond1.preheader
for.cond1.preheader:
%i.017 = phi i32 [ 0, %entry ], [ %inc6, %for.cond.cleanup3 ]
%mul = mul i32 %i.017, 20
br label %for.body4
; CHECK: for.cond1.preheader:
; CHECK: %i.017 = phi i32 [ 0, %entry ], [ %inc6, %for.cond.cleanup3 ]
; CHECK: %mul = mul i32 %i.017, 20
; CHECK: br label %for.body4
for.cond.cleanup3:
%inc6 = add i32 %i.017, 1
%cmp = icmp ult i32 %inc6, 11
br i1 %cmp, label %for.cond1.preheader, label %for.cond.cleanup
; CHECK: for.cond.cleanup3:
; CHECK: %inc6 = add i32 %i.017, 1
; CHECK: %cmp = icmp ult i32 %inc6, %flatten.tripcount
; CHECK: br i1 %cmp, label %for.cond1.preheader, label %for.cond.cleanup
for.body4:
%j.016 = phi i32 [ 0, %for.cond1.preheader ], [ %inc, %for.body4 ]
%add = add i32 %j.016, %mul
%arrayidx = getelementptr inbounds i32, i32* %A, i32 %add
store i32 30, i32* %arrayidx, align 4
%inc = add nuw nsw i32 %j.016, 1
%cmp2 = icmp ult i32 %j.016, 19
br i1 %cmp2, label %for.body4, label %for.cond.cleanup3
; CHECK: for.body4
; CHECK: %j.016 = phi i32 [ 0, %for.cond1.preheader ]
; CHECK: %add = add i32 %j.016, %mul
; CHECK: %arrayidx = getelementptr inbounds i32, i32* %A, i32 %i.017
; CHECK: store i32 30, i32* %arrayidx, align 4
; CHECK: %inc = add nuw nsw i32 %j.016, 1
; CHECK: %cmp2 = icmp ult i32 %j.016, 19
; CHECK: br label %for.cond.cleanup3
for.cond.cleanup:
%0 = load i32, i32* %A, align 4
ret i32 %0
}
declare i32 @func(i32)