1 files changed, 137 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/csr-split.ll b/llvm/test/CodeGen/ARM/csr-split.ll
new file mode 100644
index 00000000000..f9246cb6df2
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/csr-split.ll
@@ -0,0 +1,137 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -verify-machineinstrs -mtriple=arm-unknown-linux < %s | FileCheck %s
+
+; Check CSR split can work properly for tests below.
+
+@a = common dso_local local_unnamed_addr global i32 0, align 4
+
+define dso_local signext i32 @test1(i32* %b) local_unnamed_addr  {
+; CHECK-LABEL: test1:
+; CHECK:       @ %bb.0: @ %entry
+; CHECK-NEXT:    push {r4, lr}
+; CHECK-NEXT:    mov r4, r0
+; CHECK-NEXT:    ldr r0, .LCPI0_0
+; CHECK-NEXT:    ldr r0, [r0]
+; CHECK-NEXT:    cmp r0, r4
+; CHECK-NEXT:    popne {r4, lr}
+; CHECK-NEXT:    movne pc, lr
+; CHECK-NEXT:    bl callVoid
+; CHECK-NEXT:    mov r0, r4
+; CHECK-NEXT:    pop {r4, lr}
+; CHECK-NEXT:    b callNonVoid
+; CHECK-NEXT:    .p2align 2
+; CHECK-NEXT:  @ %bb.1:
+; CHECK-NEXT:  .LCPI0_0:
+; CHECK-NEXT:    .long a
+entry:
+  %0 = load i32, i32* @a, align 4, !tbaa !2
+  %conv = sext i32 %0 to i64
+  %1 = inttoptr i64 %conv to i32*
+  %cmp = icmp eq i32* %1, %b
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:                                          ; preds = %entry
+  %call = tail call signext i32 bitcast (i32 (...)* @callVoid to i32 ()*)()
+  %call2 = tail call signext i32 @callNonVoid(i32* %b)
+  br label %if.end
+
+if.end:                                           ; preds = %if.then, %entry
+  %retval.0 = phi i32 [ %call2, %if.then ], [ undef, %entry ]
+  ret i32 %retval.0
+}
+
+declare signext i32 @callVoid(...) local_unnamed_addr
+
+declare signext i32 @callNonVoid(i32*) local_unnamed_addr
+
+define dso_local signext i32 @test2(i32* %p1) local_unnamed_addr  {
+; CHECK-LABEL: test2:
+; CHECK:       @ %bb.0: @ %entry
+; CHECK-NEXT:    push {r4, lr}
+; CHECK-NEXT:    cmp r0, #0
+; CHECK-NEXT:    beq .LBB1_2
+; CHECK-NEXT:  @ %bb.1: @ %if.end
+; CHECK-NEXT:    mov r4, r0
+; CHECK-NEXT:    ldr r0, .LCPI1_0
+; CHECK-NEXT:    ldr r0, [r0]
+; CHECK-NEXT:    cmp r0, r4
+; CHECK-NEXT:    beq .LBB1_3
+; CHECK-NEXT:  .LBB1_2: @ %return
+; CHECK-NEXT:    mov r0, #0
+; CHECK-NEXT:    pop {r4, lr}
+; CHECK-NEXT:    mov pc, lr
+; CHECK-NEXT:  .LBB1_3: @ %if.then2
+; CHECK-NEXT:    bl callVoid
+; CHECK-NEXT:    mov r0, r4
+; CHECK-NEXT:    pop {r4, lr}
+; CHECK-NEXT:    b callNonVoid
+; CHECK-NEXT:    .p2align 2
+; CHECK-NEXT:  @ %bb.4:
+; CHECK-NEXT:  .LCPI1_0:
+; CHECK-NEXT:    .long a
+entry:
+  %tobool = icmp eq i32* %p1, null
+  br i1 %tobool, label %return, label %if.end
+
+if.end:                                           ; preds = %entry
+  %0 = load i32, i32* @a, align 4, !tbaa !2
+  %conv = sext i32 %0 to i64
+  %1 = inttoptr i64 %conv to i32*
+  %cmp = icmp eq i32* %1, %p1
+  br i1 %cmp, label %if.then2, label %return
+
+if.then2:                                         ; preds = %if.end
+  %call = tail call signext i32 bitcast (i32 (...)* @callVoid to i32 ()*)()
+  %call3 = tail call signext i32 @callNonVoid(i32* nonnull %p1)
+  br label %return
+
+return:                                           ; preds = %if.end, %entry, %if.then2
+  %retval.0 = phi i32 [ %call3, %if.then2 ], [ 0, %entry ], [ 0, %if.end ]
+  ret i32 %retval.0
+}
+
+
+define dso_local i8* @test3(i8** nocapture %p1, i8 zeroext %p2) local_unnamed_addr  {
+; CHECK-LABEL: test3:
+; CHECK:       @ %bb.0: @ %entry
+; CHECK-NEXT:    push {r4, r5, r11, lr}
+; CHECK-NEXT:    ldr r4, [r0]
+; CHECK-NEXT:    cmp r4, #0
+; CHECK-NEXT:    beq .LBB2_2
+; CHECK-NEXT:  @ %bb.1: @ %land.rhs
+; CHECK-NEXT:    mov r5, r0
+; CHECK-NEXT:    mov r0, r4
+; CHECK-NEXT:    bl bar
+; CHECK-NEXT:    str r0, [r5]
+; CHECK-NEXT:  .LBB2_2: @ %land.end
+; CHECK-NEXT:    mov r0, r4
+; CHECK-NEXT:    pop {r4, r5, r11, lr}
+; CHECK-NEXT:    mov pc, lr
+entry:
+  %0 = load i8*, i8** %p1, align 8, !tbaa !6
+  %tobool = icmp eq i8* %0, null
+  br i1 %tobool, label %land.end, label %land.rhs
+
+land.rhs:                                         ; preds = %entry
+  %call = tail call i8* @bar(i8* nonnull %0, i8 zeroext %p2)
+  store i8* %call, i8** %p1, align 8, !tbaa !6
+  br label %land.end
+
+land.end:                                         ; preds = %entry, %land.rhs
+  ret i8* %0
+}
+
+declare i8* @bar(i8*, i8 zeroext) local_unnamed_addr
+
+
+!llvm.module.flags = !{!0}
+!llvm.ident = !{!1}
+
+!0 = !{i32 1, !"wchar_size", i32 4}
+!1 = !{!"clang version 10.0.0 (trunk 367381) (llvm/trunk 367388)"}
+!2 = !{!3, !3, i64 0}
+!3 = !{!"int", !4, i64 0}
+!4 = !{!"omnipotent char", !5, i64 0}
+!5 = !{!"Simple C/C++ TBAA"}
+!6 = !{!7, !7, i64 0}
+!7 = !{!"any pointer", !4, i64 0}