Fun x86 encoding tricks: when adding an immediate value of 128,
use a SUB instruction instead of an ADD, because -128 can be
encoded in an 8-bit signed immediate field, while +128 can't be.
This avoids the need for a 32-bit immediate field in this case.
A similar optimization applies to 64-bit adds with 0x80000000,
with the 32-bit signed immediate field.
To support this, teach tablegen how to handle 64-bit constants.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57663 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/TGLexer.cpp b/utils/TableGen/TGLexer.cpp
index e7465de..0d83e7c 100644
--- a/utils/TableGen/TGLexer.cpp
+++ b/utils/TableGen/TGLexer.cpp
@@ -20,6 +20,7 @@
#include <cstdio>
#include <cstdlib>
#include <cstring>
+#include <cerrno>
using namespace llvm;
TGLexer::TGLexer(MemoryBuffer *StartBuf) : CurLineNo(1), CurBuf(StartBuf) {
@@ -343,7 +344,18 @@
if (CurPtr == NumStart)
return ReturnError(CurPtr-2, "Invalid hexadecimal number");
+ errno = 0;
CurIntVal = strtoll(NumStart, 0, 16);
+ if (errno == EINVAL)
+ return ReturnError(CurPtr-2, "Invalid hexadecimal number");
+ if (errno == ERANGE) {
+ errno = 0;
+ CurIntVal = (int64_t)strtoull(NumStart, 0, 16);
+ if (errno == EINVAL)
+ return ReturnError(CurPtr-2, "Invalid hexadecimal number");
+ if (errno == ERANGE)
+ return ReturnError(CurPtr-2, "Hexadecimal number out of range");
+ }
return tgtok::IntVal;
} else if (CurPtr[0] == 'b') {
++CurPtr;