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/TGParser.cpp b/utils/TableGen/TGParser.cpp
index 68a1cba..4ff108d 100644
--- a/utils/TableGen/TGParser.cpp
+++ b/utils/TableGen/TGParser.cpp
@@ -294,8 +294,8 @@
TokError("expected integer or bitrange");
return true;
}
- int Start = Lex.getCurIntVal();
- int End;
+ int64_t Start = Lex.getCurIntVal();
+ int64_t End;
if (Start < 0)
return TokError("invalid range, cannot be negative");
@@ -426,7 +426,7 @@
TokError("expected integer in bits<n> type");
return 0;
}
- unsigned Val = Lex.getCurIntVal();
+ uint64_t Val = Lex.getCurIntVal();
if (Lex.Lex() != tgtok::greater) { // Eat count.
TokError("expected '>' at end of bits<n> type");
return 0;