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Add flag to specify when no value is produced by an instruction

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4441 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-10-30 01:09:34 +00:00
parent 443d0122d7
commit 9d17740295
2 changed files with 22 additions and 12 deletions
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25
lib/Target/X86/X86InstrInfo.def
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@ -19,28 +19,29 @@
// #3: Instruction Flags - This should be a field or'd together that contains
// constants from the MachineInstrInfo.h file.
// #4: Target Specific Flags - Another bitfield containing X86 specific flags
// that we are interested in for each instruction
// that we are interested in for each instruction. These should be flags
// defined in X86InstrInfo.h in the X86II namespace.
//
// The first instruction must always be the PHI instruction:
// The first instruction must always be the PHI instruction: (FIXME, not yet)
I(PHI , "phi", 0, 0)
// The second instruction must always be the noop instruction
I(NOOP , "nop", 0, 0) // nop 90
// The second instruction must always be the noop instruction: (FIXME, not yet)
I(NOOP , "nop", 0, X86II::Void) // nop 90
// Miscellaneous instructions
I(RET , "ret", M_RET_FLAG, 0) // ret CB
I(RET , "ret", M_RET_FLAG, X86II::Void) // ret CB
// Move instructions
I(MOVir8 , "movb", 0, 0) // R = imm8 B0+ rb
I(MOVir16 , "movw", 0, 0) // R = imm16 B8+ rw
I(MOVir32 , "movl", 0, 0) // R = imm32 B8+ rd
I(MOVir8 , "movb", 0, 0) // R = imm8 B0+ rb
I(MOVir16 , "movw", 0, 0) // R = imm16 B8+ rw
I(MOVir32 , "movl", 0, 0) // R = imm32 B8+ rd
// Arithmetic instructions
I(ADDrr8 , "addb", 0, 0) // R8 += R8 00/r
I(ADDrr16 , "addw", 0, 0) // R16 += R16 01/r
I(ADDrr32 , "addl", 0, 0) // R32 += R32 02/r
I(ADDrr8 , "addb", 0, 0) // R8 += R8 00/r
I(ADDrr16 , "addw", 0, 0) // R16 += R16 01/r
I(ADDrr32 , "addl", 0, 0) // R32 += R32 02/r
// At this point, I is dead to undefine the macro
// At this point, I is dead, so undefine the macro
#undef I

9
lib/Target/X86/X86InstrInfo.h
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@ -10,6 +10,15 @@
#include "llvm/Target/MachineInstrInfo.h"
#include "X86RegisterInfo.h"
/// X86II - This namespace holds all of the target specific flags that
/// instruction info tracks.
///
namespace X86II {
enum {
Void = 1 << 0, // Set if this instruction produces no value
};
}
class X86InstrInfo : public MachineInstrInfo {
const X86RegisterInfo RI;
public: