[DCE] Salvage debug info from dead insts
This results in small increases in the size of the .debug_loc section
and the number of unique source variables in a stage2 build of opt.
llvm-svn: 325301
diff --git a/llvm/test/Transforms/DCE/basic.ll b/llvm/test/Transforms/DCE/basic.ll
index c2a5659..6282ac7 100644
--- a/llvm/test/Transforms/DCE/basic.ll
+++ b/llvm/test/Transforms/DCE/basic.ll
@@ -1,11 +1,15 @@
-; RUN: opt -dce -S < %s | FileCheck %s
-; RUN: opt -passes=dce -S < %s | FileCheck %s
+; RUN: opt -debugify -dce -S < %s | FileCheck %s
+; RUN: opt -passes='module(debugify),function(dce)' -S < %s | FileCheck %s
; CHECK-LABEL: @test
define void @test() {
-; CHECK-NOT: add
%add = add i32 1, 2
-; CHECK-NOT: sub
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[add:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_stack_value))
%sub = sub i32 %add, 1
+; CHECK-NEXT: call void @llvm.dbg.value(metadata i32 1, metadata [[sub:![0-9]+]], metadata !DIExpression(DW_OP_plus_uconst, 2, DW_OP_constu, 1, DW_OP_minus, DW_OP_stack_value))
+; CHECK-NEXT: ret void
ret void
}
+
+; CHECK: [[add]] = !DILocalVariable
+; CHECK: [[sub]] = !DILocalVariable