Improve handling of #-0 offsets for many more pre-indexed addressing modes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138754 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 2c7accd..443e544 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -638,7 +638,8 @@
// Immediate offset in range [-1020, 1020] and a multiple of 4.
if (!Mem.OffsetImm) return true;
int64_t Val = Mem.OffsetImm->getValue();
- return Val >= -1020 && Val <= 1020 && ((Val & 3) == 0);
+ return (Val >= -1020 && Val <= 1020 && ((Val & 3) == 0)) ||
+ Val == INT32_MIN;
}
bool isMemRegOffset() const {
if (Kind != Memory || !Mem.OffsetRegNum)
@@ -709,7 +710,7 @@
// Immediate offset in range [-4095, 4095].
if (!Mem.OffsetImm) return true;
int64_t Val = Mem.OffsetImm->getValue();
- return Val > -4096 && Val < 4096;
+ return (Val > -4096 && Val < 4096) || (Val == INT32_MIN);
}
bool isPostIdxImm8() const {
if (Kind != Immediate)
@@ -2565,8 +2566,7 @@
Parser.Lex(); // Eat the '#'.
E = Parser.getTok().getLoc();
- // FIXME: Special case #-0 so we can correctly set the U bit.
-
+ bool isNegative = getParser().getTok().is(AsmToken::Minus);
const MCExpr *Offset;
if (getParser().ParseExpression(Offset))
return true;
@@ -2578,6 +2578,11 @@
if (!CE)
return Error (E, "constant expression expected");
+ // If the constant was #-0, represent it as INT32_MIN.
+ int32_t Val = CE->getValue();
+ if (isNegative && Val == 0)
+ CE = MCConstantExpr::Create(INT32_MIN, getContext());
+
// Now we should have the closing ']'
E = Parser.getTok().getLoc();
if (Parser.getTok().isNot(AsmToken::RBrac))