fix PR5930, allowing the asmprinter to emit difference between
two labels as a truncate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92455 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 6b24e24..6f26fc4 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -819,7 +819,6 @@
const TargetData *TD = TM.getTargetData();
unsigned Opcode = CE->getOpcode();
switch (Opcode) {
- case Instruction::Trunc:
case Instruction::ZExt:
case Instruction::SExt:
case Instruction::FPTrunc:
@@ -865,7 +864,6 @@
return EmitConstantValueOnly(Op);
}
-
case Instruction::PtrToInt: {
// Support only foldable casts to/from pointers that can be eliminated by
// changing the pointer to the appropriately sized integer type.
@@ -887,6 +885,14 @@
O << ") & " << S.str() << ')';
break;
}
+
+ case Instruction::Trunc:
+ // We emit the value and depend on the assembler to truncate the generated
+ // expression properly. This is important for differences between
+ // blockaddress labels. Since the two labels are in the same function, it
+ // is reasonable to treat their delta as a 32-bit value.
+ return EmitConstantValueOnly(CE->getOperand(0));
+
case Instruction::Add:
case Instruction::Sub:
case Instruction::And: