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1; RUN: opt < %s -loop-reduce -mtriple=x86_64-- -S | FileCheck %s -check-prefix=BOTH -check-prefix=INSN
2; RUN: opt < %s -loop-reduce -mtriple=x86_64-- -lsr-insns-cost=false -S | FileCheck %s -check-prefix=BOTH -check-prefix=REGS
3; RUN: llc < %s -O2 -mtriple=x86_64-- -lsr-insns-cost -asm-verbose=0 | FileCheck %s
4
5; OPT checks that LSR prefers less instructions to less registers.
6; For x86 LSR should prefer complicated address to new lsr induction
7; variables.
8
9; BOTH: for.body:
10; INSN:   getelementptr i32, i32* %x, i64 %indvars.iv
11; INSN:   getelementptr i32, i32* %y, i64 %indvars.iv
12; INSN:   getelementptr i32, i32* %q, i64 %indvars.iv
13; REGS:   %lsr.iv4 = phi
14; REGS:   %lsr.iv2 = phi
15; REGS:   %lsr.iv1 = phi
16; REGS:   getelementptr i32, i32* %lsr.iv1, i64 1
17; REGS:   getelementptr i32, i32* %lsr.iv2, i64 1
18; REGS:   getelementptr i32, i32* %lsr.iv4, i64 1
19
20; LLC checks that LSR prefers less instructions to less registers.
21; LSR should prefer complicated address to additonal add instructions.
22
23; CHECK:      LBB0_2:
24; CHECK-NEXT:   movl (%r{{.+}},
25; CHECK-NEXT:   addl (%r{{.+}},
26; CHECK-NEXT:   movl %e{{.+}}, (%r{{.+}},
27
28target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
29
30; Function Attrs: norecurse nounwind uwtable
31define void @foo(i32* nocapture readonly %x, i32* nocapture readonly %y, i32* nocapture %q, i32 %n) {
32entry:
33  %cmp10 = icmp sgt i32 %n, 0
34  br i1 %cmp10, label %for.body.preheader, label %for.cond.cleanup
35
36for.body.preheader:                               ; preds = %entry
37  %wide.trip.count = zext i32 %n to i64
38  br label %for.body
39
40for.cond.cleanup.loopexit:                        ; preds = %for.body
41  br label %for.cond.cleanup
42
43for.cond.cleanup:                                 ; preds = %for.cond.cleanup.loopexit, %entry
44  ret void
45
46for.body:                                         ; preds = %for.body, %for.body.preheader
47  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
48  %arrayidx = getelementptr inbounds i32, i32* %x, i64 %indvars.iv
49  %tmp = load i32, i32* %arrayidx, align 4
50  %arrayidx2 = getelementptr inbounds i32, i32* %y, i64 %indvars.iv
51  %tmp1 = load i32, i32* %arrayidx2, align 4
52  %add = add nsw i32 %tmp1, %tmp
53  %arrayidx4 = getelementptr inbounds i32, i32* %q, i64 %indvars.iv
54  store i32 %add, i32* %arrayidx4, align 4
55  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
56  %exitcond = icmp eq i64 %indvars.iv.next, %wide.trip.count
57  br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body
58}
59