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author | Dan Gohman <gohman@apple.com> | 2008-10-17 01:33:43 +0000 |
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committer | Dan Gohman <gohman@apple.com> | 2008-10-17 01:33:43 +0000 |
commit | 63f97201dc9dcebbe84d1b73113166c64212b4b8 (patch) | |
tree | 718d542a3b0cf7a6c76944afed13d26afbb6a12f /utils/TableGen/Record.h | |
parent | 74feef261a43392bc85280f66c75fbd4e2ccf73d (diff) | |
download | external_llvm-63f97201dc9dcebbe84d1b73113166c64212b4b8.zip external_llvm-63f97201dc9dcebbe84d1b73113166c64212b4b8.tar.gz external_llvm-63f97201dc9dcebbe84d1b73113166c64212b4b8.tar.bz2 |
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
Diffstat (limited to 'utils/TableGen/Record.h')
-rw-r--r-- | utils/TableGen/Record.h | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/utils/TableGen/Record.h b/utils/TableGen/Record.h index 90e246e..928fd5c 100644 --- a/utils/TableGen/Record.h +++ b/utils/TableGen/Record.h @@ -565,11 +565,11 @@ public: /// IntInit - 7 - Represent an initalization by a literal integer value. /// class IntInit : public Init { - int Value; + int64_t Value; public: - explicit IntInit(int V) : Value(V) {} + explicit IntInit(int64_t V) : Value(V) {} - int getValue() const { return Value; } + int64_t getValue() const { return Value; } virtual Init *convertInitializerTo(RecTy *Ty) { return Ty->convertValue(this); @@ -1082,7 +1082,7 @@ public: /// its value as a vector of integers, throwing an exception if the field does /// not exist or if the value is not the right type. /// - std::vector<int> getValueAsListOfInts(const std::string &FieldName) const; + std::vector<int64_t> getValueAsListOfInts(const std::string &FieldName) const; /// getValueAsDef - This method looks up the specified field and returns its /// value as a Record, throwing an exception if the field does not exist or if @@ -1097,10 +1097,10 @@ public: bool getValueAsBit(const std::string &FieldName) const; /// getValueAsInt - This method looks up the specified field and returns its - /// value as an int, throwing an exception if the field does not exist or if - /// the value is not the right type. + /// value as an int64_t, throwing an exception if the field does not exist or + /// if the value is not the right type. /// - int getValueAsInt(const std::string &FieldName) const; + int64_t getValueAsInt(const std::string &FieldName) const; /// getValueAsDag - This method looks up the specified field and returns its /// value as an Dag, throwing an exception if the field does not exist or if |