[X86] Add test case for PR44412. NFC

llvm · Dec 30, 2019 · 6185dc0 · 6185dc0
1 parent 70f8dd4
commit 6185dc0
Showing 1 changed file with 36 additions and 0 deletions.
diff --git a/llvm/test/CodeGen/X86/pr44412.ll b/llvm/test/CodeGen/X86/pr44412.ll
@@ -0,0 +1,36 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+;RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
+
+define void @bar(i32 %0, i32 %1) nounwind {
+; CHECK-LABEL: bar:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    testl %edi, %edi
+; CHECK-NEXT:    je .LBB0_3
+; CHECK-NEXT:  # %bb.1: # %.preheader
+; CHECK-NEXT:    movl %edi, %ebx
+; CHECK-NEXT:    decl %ebx
+; CHECK-NEXT:    .p2align 4, 0x90
+; CHECK-NEXT:  .LBB0_2: # =>This Inner Loop Header: Depth=1
+; CHECK-NEXT:    movl %ebx, %edi
+; CHECK-NEXT:    callq foo
+; CHECK-NEXT:    decl %ebx
+; CHECK-NEXT:    cmpl $-1, %ebx
+; CHECK-NEXT:    jne .LBB0_2
+; CHECK-NEXT:  .LBB0_3:
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    retq
+  %3 = icmp eq i32 %0, 0
+  br i1 %3, label %8, label %4
+
+4:                                                ; preds = %2, %4
+  %5 = phi i32 [ %6, %4 ], [ %0, %2 ]
+  %6 = add nsw i32 %5, -1
+  tail call void @foo(i32 %6)
+  %7 = icmp eq i32 %6, 0
+  br i1 %7, label %8, label %4
+
+8:                                                ; preds = %4, %2
+  ret void
+}
+declare void @foo(i32)