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; RUN: llc -regalloc=greedy < %s | FileCheck %s
; LSR shouldn't introduce more induction variables than needed, increasing
; register pressure and therefore spilling. There is more room for improvement
; here.
; CHECK: sub sp, #{{40|32|28|24}}
; CHECK: %for.inc
; CHECK-NOT: ldr
; CHECK: add
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
target triple = "thumbv7-apple-ios"
%struct.partition_entry = type { i32, i32, i64, i64 }
define i32 @partition_overlap_check(%struct.partition_entry* nocapture %part, i32 %num_entries) nounwind readonly optsize ssp {
entry:
%cmp79 = icmp sgt i32 %num_entries, 0
br i1 %cmp79, label %outer.loop, label %for.end72
outer.loop: ; preds = %for.inc69, %entry
%overlap.081 = phi i32 [ %overlap.4, %for.inc69 ], [ 0, %entry ]
%0 = phi i32 [ %inc71, %for.inc69 ], [ 0, %entry ]
%offset = getelementptr %struct.partition_entry* %part, i32 %0, i32 2
%len = getelementptr %struct.partition_entry* %part, i32 %0, i32 3
%tmp5 = load i64* %offset, align 4
%tmp15 = load i64* %len, align 4
%add = add nsw i64 %tmp15, %tmp5
br label %inner.loop
inner.loop: ; preds = %for.inc, %outer.loop
%overlap.178 = phi i32 [ %overlap.081, %outer.loop ], [ %overlap.4, %for.inc ]
%1 = phi i32 [ 0, %outer.loop ], [ %inc, %for.inc ]
%cmp23 = icmp eq i32 %0, %1
br i1 %cmp23, label %for.inc, label %if.end
if.end: ; preds = %inner.loop
%len39 = getelementptr %struct.partition_entry* %part, i32 %1, i32 3
%offset28 = getelementptr %struct.partition_entry* %part, i32 %1, i32 2
%tmp29 = load i64* %offset28, align 4
%tmp40 = load i64* %len39, align 4
%add41 = add nsw i64 %tmp40, %tmp29
%cmp44 = icmp sge i64 %tmp29, %tmp5
%cmp47 = icmp slt i64 %tmp29, %add
%or.cond = and i1 %cmp44, %cmp47
%overlap.2 = select i1 %or.cond, i32 1, i32 %overlap.178
%cmp52 = icmp sle i64 %add41, %add
%cmp56 = icmp sgt i64 %add41, %tmp5
%or.cond74 = and i1 %cmp52, %cmp56
%overlap.3 = select i1 %or.cond74, i32 1, i32 %overlap.2
%cmp61 = icmp sgt i64 %tmp29, %tmp5
%cmp65 = icmp slt i64 %add41, %add
%or.cond75 = or i1 %cmp61, %cmp65
br i1 %or.cond75, label %for.inc, label %if.then66
if.then66: ; preds = %if.end
br label %for.inc
for.inc: ; preds = %if.end, %if.then66, %inner.loop
%overlap.4 = phi i32 [ %overlap.178, %inner.loop ], [ 1, %if.then66 ], [ %overlap.3, %if.end ]
%inc = add nsw i32 %1, 1
%exitcond = icmp eq i32 %inc, %num_entries
br i1 %exitcond, label %for.inc69, label %inner.loop
for.inc69: ; preds = %for.inc
%inc71 = add nsw i32 %0, 1
%exitcond83 = icmp eq i32 %inc71, %num_entries
br i1 %exitcond83, label %for.end72, label %outer.loop
for.end72: ; preds = %for.inc69, %entry
%overlap.0.lcssa = phi i32 [ 0, %entry ], [ %overlap.4, %for.inc69 ]
ret i32 %overlap.0.lcssa
}
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