[InstCombine] Added mempcpy tests [NFC]

llvm-svn: 367825

diff --git a/llvm/test/Transforms/InstCombine/mempcpy.ll b/llvm/test/Transforms/InstCombine/mempcpy.ll
new file mode 100644 (file)
index 0000000..ce372d8
--- /dev/null
+++ b/llvm/test/Transforms/InstCombine/mempcpy.ll
@@ -0,0 +1,31 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -instcombine -S < %s | FileCheck %s
+
+define i8* @memcpy_nonconst_n(i8* %d, i8* nocapture readonly %s, i64 %n) {
+; CHECK-LABEL: @memcpy_nonconst_n(
+; CHECK-NEXT:    [[R:%.*]] = tail call i8* @mempcpy(i8* [[D:%.*]], i8* [[S:%.*]], i64 [[N:%.*]])
+; CHECK-NEXT:    ret i8* [[R]]
+;
+  %r = tail call i8* @mempcpy(i8* %d, i8* %s, i64 %n)
+  ret i8* %r
+}
+
+define i8* @memcpy_small_const_n(i8* %d, i8* nocapture readonly %s) {
+; CHECK-LABEL: @memcpy_small_const_n(
+; CHECK-NEXT:    [[R:%.*]] = tail call i8* @mempcpy(i8* [[D:%.*]], i8* [[S:%.*]], i64 8)
+; CHECK-NEXT:    ret i8* [[R]]
+;
+  %r = tail call i8* @mempcpy(i8* %d, i8* %s, i64 8)
+  ret i8* %r
+}
+
+define i8* @memcpy_big_const_n(i8* %d, i8* nocapture readonly %s) {
+; CHECK-LABEL: @memcpy_big_const_n(
+; CHECK-NEXT:    [[R:%.*]] = tail call i8* @mempcpy(i8* [[D:%.*]], i8* [[S:%.*]], i64 1024)
+; CHECK-NEXT:    ret i8* [[R]]
+;
+  %r = tail call i8* @mempcpy(i8* %d, i8* %s, i64 1024)
+  ret i8* %r
+}
+
+declare i8* @mempcpy(i8*, i8* nocapture readonly, i64)