[ThinLTO] - Fix for "ThinLTO inlines variables that should be discarded".
This fixes PR36187.
Patch teaches ThinLTO to drop non-prevailing variables,
just like we recently did for functions (in r323633).
Differential revision: https://reviews.llvm.org/D42798
llvm-svn: 324075
diff --git a/llvm/test/LTO/Resolution/X86/not-prevailing-variables.ll b/llvm/test/LTO/Resolution/X86/not-prevailing-variables.ll
new file mode 100644
index 0000000..2b6073a
--- /dev/null
+++ b/llvm/test/LTO/Resolution/X86/not-prevailing-variables.ll
@@ -0,0 +1,35 @@
+; RUN: opt -module-summary %s -o %t1.o
+; RUN: llvm-lto2 run -save-temps -o %t2.o %t1.o \
+; RUN: -r %t1.o,testVar1,plx -r %t1.o,testVar2,plx \
+; RUN: -r %t1.o,var1,pl -r %t1.o,var2,lx
+
+; Test contains two variables: var1 and var2.
+; var2 is not prevailing and here we check it is not inlined.
+
+; Check 'var2' was not inlined.
+; RUN: llvm-objdump -d %t2.o.1 | FileCheck %s
+; CHECK: testVar1:
+; CHECK-NEXT: movl $10, %eax
+; CHECK-NEXT: retq
+; CHECK: testVar2:
+; CHECK-NEXT: movl (%rip), %eax
+; CHECK-NEXT: retq
+
+; Check 'var2' is undefined.
+; RUN: llvm-readelf --symbols %t2.o.1 | FileCheck %s --check-prefix=UND
+; UND: NOTYPE GLOBAL DEFAULT UND var2
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@var1 = global i32 10, align 4
+define i32 @testVar1() {
+ %1 = load i32, i32* @var1, align 4
+ ret i32 %1
+}
+
+@var2 = global i32 11, align 4
+define i32 @testVar2() {
+ %1 = load i32, i32* @var2, align 4
+ ret i32 %1
+}