Test for external non-bitcode libcall

Author: mysterymath

llvm/test/LTO/Resolution/X86/libcall-external-not-bitcode.ll

@@ -0,0 +1,20 @@
+; RUN: opt %s -o %t -module-summary -mtriple x86_64-unknown-linux-musl
+; RUN: llvm-lto2 run -o %t2 \
+; RUN:   -r %t,foo,plx \
+; RUN:   -r %t,memcmp,x \
+; RUN:   -r %t,bcmp,pl %t -save-temps
+; RUN: llvm-dis %t2.1.4.opt.bc -o - | FileCheck %s
+
+define i1 @foo(ptr %0, ptr %1, i64 %2) {
+  ; CHECK-LABEL: define{{.*}}i1 @foo
+  ; CHECK-NEXT: %bcmp = {{.*}}call i32 @bcmp
+  ; CHECK-NEXT: %eq = icmp eq i32 %bcmp, 0
+  ; CHECK-NEXT: ret i1 %eq
+
+  %cmp = call i32 @memcmp(ptr %0, ptr %1, i64 %2)
+  %eq = icmp eq i32 %cmp, 0
+  ret i1 %eq
+}
+
+declare i32 @memcmp(ptr, ptr, i64)
+declare i32 @bcmp(ptr, ptr, i64)

llvm/test/LTO/Resolution/X86/bcmp-libcall.ll renamed to llvm/test/LTO/Resolution/X86/libcall-in-tu.ll

@@ -23,7 +23,7 @@ define i1 @foo(ptr %0, ptr %1, i64 %2) {
 }
 
 declare i32 @memcmp(ptr, ptr, i64)
-declare i32 @bcmp_impl(ptr, ptr, i64);
+declare i32 @bcmp_impl(ptr, ptr, i64)
 
 ;; Ensure bcmp is not removed from module because it is external.
 ; CHECK: define dso_local i32 @bcmp