================
@@ -0,0 +1,95 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -O=3 -mtriple=avr-none -mcpu=attiny85 -verify-machineinstrs |
FileCheck %s
+
+declare dso_local void @foo(i16 noundef) addrspace(1)
+@ci = dso_local global [30 x i16] zeroinitializer, align 1
+define void @loopreduce() {
+; CHECK-LABEL: loopreduce:
+; CHECK: ; %bb.0: ; %entry
+; CHECK-NEXT: push r14
+; CHECK-NEXT: push r15
+; CHECK-NEXT: push r16
+; CHECK-NEXT: push r17
+; CHECK-NEXT: ldi r26, lo8(ci)
+; CHECK-NEXT: ldi r27, hi8(ci)
+; CHECK-NEXT: ldi r16, lo8(ci+60)
+; CHECK-NEXT: ldi r17, hi8(ci+60)
+; CHECK-NEXT: .LBB0_1: ; %for.body
+; CHECK-NEXT: ; =>This Inner Loop Header: Depth=1
+; CHECK-NEXT: ld r24, X+
+; CHECK-NEXT: ld r25, X+
+; CHECK-NEXT: movw r14, r26
+; CHECK-NEXT: rcall foo
+; CHECK-NEXT: movw r26, r14
+; CHECK-NEXT: cp r26, r16
+; CHECK-NEXT: cpc r27, r17
+; CHECK-NEXT: brne .LBB0_1
+; CHECK-NEXT: ; %bb.2: ; %for.cond.cleanup
+; CHECK-NEXT: pop r17
+; CHECK-NEXT: pop r16
+; CHECK-NEXT: pop r15
+; CHECK-NEXT: pop r14
+; CHECK-NEXT: ret
+entry:
+ br label %for.body
+for.body: ; preds = %entry, %for.body
+ %i.03 = phi i16 [ 0, %entry ], [ %inc, %for.body ]
+ %arrayidx = getelementptr inbounds nuw [30 x i16], ptr @ci, i16 0, i16 %i.03
+ %0 = load i16, ptr %arrayidx, align 1
+ tail call addrspace(1) void @foo(i16 noundef %0)
+ %inc = add nuw nsw i16 %i.03, 1
+ %exitcond.not = icmp eq i16 %inc, 30
+ br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
+; Exit blocks
+for.cond.cleanup: ; preds = %for.body
+ ret void
+}
+
+define void @indvar() {
----------------
tomtor wrote:
There is a minimal difference, loop starting at 7 vs 8 and different
ordering... I would like to understand why we don't get the optimization in
LLC. I leave the test in as reminder.
https://github.com/llvm/llvm-project/pull/152028
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