1 files changed, 94 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/global-merge-group-by-use.ll b/test/CodeGen/AArch64/global-merge-group-by-use.ll
new file mode 100644
index 000000000000..ddc044ed9e08
--- /dev/null
+++ b/test/CodeGen/AArch64/global-merge-group-by-use.ll
@@ -0,0 +1,94 @@
+; RUN: llc -mtriple=aarch64-apple-ios -asm-verbose=false -aarch64-collect-loh=false \
+; RUN:   -aarch64-global-merge -global-merge-group-by-use -global-merge-ignore-single-use=false \
+; RUN:   %s -o - | FileCheck %s
+
+; We assume that globals of the same size aren't reordered inside a set.
+
+; Check that we create two MergedGlobal instances for two functions using
+; disjoint sets of globals
+
+@m1 = internal global i32 0, align 4
+@n1 = internal global i32 0, align 4
+
+; CHECK-LABEL: f1:
+define void @f1(i32 %a1, i32 %a2) #0 {
+; CHECK-NEXT: adrp x8, [[SET1:__MergedGlobals.[0-9]*]]@PAGE
+; CHECK-NEXT: add x8, x8, [[SET1]]@PAGEOFF
+; CHECK-NEXT: stp w0, w1, [x8]
+; CHECK-NEXT: ret
+  store i32 %a1, i32* @m1, align 4
+  store i32 %a2, i32* @n1, align 4
+  ret void
+}
+
+@m2 = internal global i32 0, align 4
+@n2 = internal global i32 0, align 4
+@o2 = internal global i32 0, align 4
+
+; CHECK-LABEL: f2:
+define void @f2(i32 %a1, i32 %a2, i32 %a3) #0 {
+; CHECK-NEXT: adrp x8, [[SET2:__MergedGlobals.[0-9]*]]@PAGE
+; CHECK-NEXT: add x8, x8, [[SET2]]@PAGEOFF
+; CHECK-NEXT: stp w0, w1, [x8]
+; CHECK-NEXT: str w2, [x8, #8]
+; CHECK-NEXT: ret
+  store i32 %a1, i32* @m2, align 4
+  store i32 %a2, i32* @n2, align 4
+  store i32 %a3, i32* @o2, align 4
+  ret void
+}
+
+; Sanity-check (don't worry about cost models) that we pick the biggest subset
+; of all global used "together" directly or indirectly.  Here, that means
+; merging n3, m4, and n4 together, but ignoring m3.
+
+@m3 = internal global i32 0, align 4
+@n3 = internal global i32 0, align 4
+
+; CHECK-LABEL: f3:
+define void @f3(i32 %a1, i32 %a2) #0 {
+; CHECK-NEXT: adrp x8, _m3@PAGE
+; CHECK-NEXT: adrp x9, [[SET3:__MergedGlobals[0-9]*]]@PAGE
+; CHECK-NEXT: str w0, [x8, _m3@PAGEOFF]
+; CHECK-NEXT: str w1, [x9, [[SET3]]@PAGEOFF]
+; CHECK-NEXT: ret
+  store i32 %a1, i32* @m3, align 4
+  store i32 %a2, i32* @n3, align 4
+  ret void
+}
+
+@m4 = internal global i32 0, align 4
+@n4 = internal global i32 0, align 4
+
+; CHECK-LABEL: f4:
+define void @f4(i32 %a1, i32 %a2, i32 %a3) #0 {
+; CHECK-NEXT: adrp x8, [[SET3]]@PAGE
+; CHECK-NEXT: add x8, x8, [[SET3]]@PAGEOFF
+; CHECK-NEXT: stp w0, w1, [x8, #4]
+; CHECK-NEXT: str w2, [x8]
+; CHECK-NEXT: ret
+  store i32 %a1, i32* @m4, align 4
+  store i32 %a2, i32* @n4, align 4
+  store i32 %a3, i32* @n3, align 4
+  ret void
+}
+
+; Finally, check that we don't do anything with one-element global sets.
+@o5 = internal global i32 0, align 4
+
+; CHECK-LABEL: f5:
+define void @f5(i32 %a1) #0 {
+; CHECK-NEXT: adrp x8, _o5@PAGE
+; CHECK-NEXT: str w0, [x8, _o5@PAGEOFF]
+; CHECK-NEXT: ret
+  store i32 %a1, i32* @o5, align 4
+  ret void
+}
+
+; CHECK-DAG: .zerofill __DATA,__bss,_o5,4,2
+
+; CHECK-DAG: .zerofill __DATA,__bss,[[SET1]],8,3
+; CHECK-DAG: .zerofill __DATA,__bss,[[SET2]],12,3
+; CHECK-DAG: .zerofill __DATA,__bss,[[SET3]],12,3
+
+attributes #0 = { nounwind }