1 files changed, 57 insertions, 0 deletions
diff --git a/test/CodeGen/X86/lrshrink.ll b/test/CodeGen/X86/lrshrink.ll
new file mode 100644
index 000000000000..a9cf086dbd90
--- /dev/null
+++ b/test/CodeGen/X86/lrshrink.ll
@@ -0,0 +1,57 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
+
+; Checks if "%7 = add nuw nsw i64 %4, %2" is moved before the last call
+; to minimize live-range.
+
+define i64 @test(i1 %a, i64 %r1, i64 %r2, i64 %s1, i64 %s2, i64 %t1, i64 %t2) {
+entry:
+  br i1 %a, label %then, label %else
+
+then:
+  br label %else
+
+else:
+  %0 = phi i64 [ 4, %entry ], [ 10, %then ]
+  %r = phi i64 [ %r1, %entry ], [ %r2, %then ]
+  %s = phi i64 [ %s1, %entry ], [ %s2, %then ]
+  %t = phi i64 [ %t1, %entry ], [ %t2, %then ]
+; CHECK-LABEL: test:
+; CHECK: add
+; CHECK: add
+; CHECK: call
+; CHECK: add
+; CHECK: call
+; CHECK: add
+; CHECK: call
+; CHECK: add
+  %1 = tail call i32 @_Z3foov()
+  %2 = zext i32 %1 to i64
+  %3 = tail call i32 @_Z3foov()
+  %4 = zext i32 %3 to i64
+  %5 = tail call i32 @_Z3foov()
+  %6 = zext i32 %5 to i64
+  %7 = add nuw nsw i64 %0, %r
+  tail call void @llvm.dbg.value(metadata i64 %7, i64 0, metadata !5, metadata !DIExpression()), !dbg !6
+  %8 = add nuw nsw i64 %2, %7
+  %9 = add nuw nsw i64 %4, %8
+  %10 = add nuw nsw i64 %6, %9
+  %11 = add nuw nsw i64 %s, %t
+  tail call void @llvm.dbg.value(metadata i64 %11, i64 0, metadata !5, metadata !DIExpression()), !dbg !6
+  %12 = add nuw nsw i64 %10, %11
+  ret i64 %12
+}
+
+declare i32 @_Z3foov()
+declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!1, !2}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, emissionKind: FullDebug)
+!1 = !{i32 2, !"Dwarf Version", i32 4}
+!2 = !{i32 2, !"Debug Info Version", i32 3}
+!3 = !DIFile(filename: "a.c", directory: "./")
+!4 = distinct !DISubprogram(name: "test", scope: !3, unit: !0)
+!5 = !DILocalVariable(name: "x", scope: !4)
+!6 = !DILocation(line: 4, scope: !4)