[AArch64] Add test case for fusion of literal generation

Add test case from https://reviews.llvm.org/D28698 that was somehow lost in
transit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295775 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/AArch64/misched-fusion-lit.ll b/test/CodeGen/AArch64/misched-fusion-lit.ll
new file mode 100644 (file)
index 0000000..45aa67e
--- /dev/null
+++ b/test/CodeGen/AArch64/misched-fusion-lit.ll
@@ -0,0 +1,46 @@
+; RUN: llc %s -o - -mtriple=aarch64-unknown -mattr=-fuse-literals | FileCheck %s --check-prefix=CHECK --check-prefix=CHECKDONT
+; RUN: llc %s -o - -mtriple=aarch64-unknown -mattr=+fuse-literals | FileCheck %s --check-prefix=CHECK --check-prefix=CHECKFUSE
+; RUN: llc %s -o - -mtriple=aarch64-unknown -mcpu=cortex-a57      | FileCheck %s --check-prefix=CHECK --check-prefix=CHECKFUSE
+
+@g = common local_unnamed_addr global i8* null, align 8
+
+define i8* @litp(i32 %a, i32 %b) {
+entry:
+  %add = add nsw i32 %b, %a
+  %idx.ext = sext i32 %add to i64
+  %add.ptr = getelementptr i8, i8* bitcast (i8* (i32, i32)* @litp to i8*), i64 %idx.ext
+  store i8* %add.ptr, i8** @g, align 8
+  ret i8* %add.ptr
+
+; CHECK-LABEL: litp:
+; CHECK: adrp [[R:x[0-9]+]], litp
+; CHECKDONT-NEXT: add {{w[0-9]+}}, {{w[0-9]+}}, {{w[0-9]+}}
+; CHECKFUSE-NEXT: add {{x[0-9]+}}, [[R]], :lo12:litp
+}
+
+define i32 @liti(i32 %a, i32 %b) {
+entry:
+  %add = add i32 %a, -262095121
+  %add1 = add i32 %add, %b
+  ret i32 %add1
+
+; CHECK-LABEL: liti:
+; CHECK: mov [[R:w[0-9]+]], {{#[0-9]+}}
+; CHECKDONT-NEXT: add {{w[0-9]+}}, {{w[0-9]+}}, {{w[0-9]+}}
+; CHECKFUSE-NEXT: movk [[R]], {{#[0-9]+}}, lsl #16
+}
+
+; Function Attrs: norecurse nounwind readnone
+define i64 @litl(i64 %a, i64 %b) {
+entry:
+  %add = add i64 %a, 2208998440489107183
+  %add1 = add i64 %add, %b
+  ret i64 %add1
+
+; CHECK-LABEL: litl:
+; CHECK: mov [[R:x[0-9]+]], {{#[0-9]+}}
+; CHECK-NEXT: movk [[R]], {{#[0-9]+}}, lsl #16
+; CHECK: movk [[R]], {{#[0-9]+}}, lsl #32
+; CHECKDONT-NEXT: add {{x[0-9]+}}, {{x[0-9]+}}, {{x[0-9]+}}
+; CHECKFUSE-NEXT: movk [[R]], {{#[0-9]+}}, lsl #48
+}