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[ARM] Test unroll behaviour on machines with low overhead branching #118692

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jthackray merged 1 commit into from
Dec 6, 2024
Merged

[ARM] Test unroll behaviour on machines with low overhead branching #118692

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63 changes: 63 additions & 0 deletions llvm/test/Transforms/LoopUnroll/ARM/lob-unroll.ll
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; RUN: opt -mcpu=cortex-m55 -mtriple=thumbv8.1m.main -passes=loop-unroll -S %s -o - | FileCheck %s --check-prefix=LOB

; This test checks behaviour of loop unrolling on processors with low overhead branching available

; LOB-CHECK-LABEL: for.body{{.*}}.prol
; LOB-COUNT-1: fmul fast float
; LOB-CHECK-LABEL: for.body{{.*}}.prol.1
; LOB-COUNT-1: fmul fast float
; LOB-CHECK-LABEL: for.body{{.*}}.prol.2
; LOB-COUNT-1: fmul fast float
; LOB-CHECK-LABEL: for.body{{.*}}
; LOB-COUNT-4: fmul fast float
; LOB-NOT: fmul fast float

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: readwrite)
define dso_local void @test(i32 noundef %n, ptr nocapture noundef %pA) local_unnamed_addr #0 {
entry:
%cmp46 = icmp sgt i32 %n, 0
br i1 %cmp46, label %for.body, label %for.cond.cleanup

for.cond.loopexit: ; preds = %for.cond6.for.cond.cleanup8_crit_edge.us, %for.body
%exitcond49.not = icmp eq i32 %add, %n
br i1 %exitcond49.not, label %for.cond.cleanup, label %for.body

for.cond.cleanup: ; preds = %for.cond.loopexit, %entry
ret void

for.body: ; preds = %entry, %for.cond.loopexit
%k.047 = phi i32 [ %add, %for.cond.loopexit ], [ 0, %entry ]
%add = add nuw nsw i32 %k.047, 1
%cmp244 = icmp slt i32 %add, %n
br i1 %cmp244, label %for.cond6.preheader.lr.ph, label %for.cond.loopexit

for.cond6.preheader.lr.ph: ; preds = %for.body
%invariant.gep = getelementptr float, ptr %pA, i32 %k.047
br label %for.cond6.preheader.us

for.cond6.preheader.us: ; preds = %for.cond6.for.cond.cleanup8_crit_edge.us, %for.cond6.preheader.lr.ph
%w.045.us = phi i32 [ %add, %for.cond6.preheader.lr.ph ], [ %inc19.us, %for.cond6.for.cond.cleanup8_crit_edge.us ]
%mul.us = mul nuw nsw i32 %w.045.us, %n
%0 = getelementptr float, ptr %pA, i32 %mul.us
%arrayidx.us = getelementptr float, ptr %0, i32 %k.047
br label %for.body9.us

for.body9.us: ; preds = %for.cond6.preheader.us, %for.body9.us
%x.043.us = phi i32 [ %add, %for.cond6.preheader.us ], [ %inc.us, %for.body9.us ]
%1 = load float, ptr %arrayidx.us, align 4
%mul11.us = mul nuw nsw i32 %x.043.us, %n
%gep.us = getelementptr float, ptr %invariant.gep, i32 %mul11.us
%2 = load float, ptr %gep.us, align 4
%mul14.us = fmul fast float %2, %1
%arrayidx17.us = getelementptr float, ptr %0, i32 %x.043.us
store float %mul14.us, ptr %arrayidx17.us, align 4
%inc.us = add nuw nsw i32 %x.043.us, 1
%exitcond.not = icmp eq i32 %inc.us, %n
br i1 %exitcond.not, label %for.cond6.for.cond.cleanup8_crit_edge.us, label %for.body9.us

for.cond6.for.cond.cleanup8_crit_edge.us: ; preds = %for.body9.us
%inc19.us = add nuw nsw i32 %w.045.us, 1
%exitcond48.not = icmp eq i32 %inc19.us, %n
br i1 %exitcond48.not, label %for.cond.loopexit, label %for.cond6.preheader.us
}

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