LLVM  14.0.0git
Macros | Functions | Variables
GCNPreRAOptimizations.cpp File Reference
#include "AMDGPU.h"
#include "GCNSubtarget.h"
#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
#include "llvm/CodeGen/LiveIntervals.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/InitializePasses.h"
Include dependency graph for GCNPreRAOptimizations.cpp:

Go to the source code of this file.

Macros

#define DEBUG_TYPE   "amdgpu-pre-ra-optimizations"
 

Functions

 INITIALIZE_PASS_BEGIN (GCNPreRAOptimizations, DEBUG_TYPE, "AMDGPU Pre-RA optimizations", false, false) INITIALIZE_PASS_END(GCNPreRAOptimizations
 

Variables

 DEBUG_TYPE
 
Pre RA optimizations
 
Pre RA false
 

Detailed Description

This pass combines split register tuple initialization into a single psuedo:

undef %0.sub1:sreg_64 = S_MOV_B32 1 %0.sub0:sreg_64 = S_MOV_B32 2 => %0:sreg_64 = S_MOV_B64_IMM_PSEUDO 0x200000001

This is to allow rematerialization of a value instead of spilling. It is supposed to be done after register coalescer to allow it to do its job and before actual register allocation to allow rematerialization.

Right now the pass only handles 64 bit SGPRs with immediate initializers, although the same shall be possible with other register classes and instructions if necessary.

Definition in file GCNPreRAOptimizations.cpp.

Macro Definition Documentation

◆ DEBUG_TYPE

#define DEBUG_TYPE   "amdgpu-pre-ra-optimizations"

Definition at line 36 of file GCNPreRAOptimizations.cpp.

Function Documentation

◆ INITIALIZE_PASS_BEGIN()

INITIALIZE_PASS_BEGIN ( GCNPreRAOptimizations  ,
DEBUG_TYPE  ,
"AMDGPU Pre-RA optimizations ,
false  ,
false   
)

Variable Documentation

◆ DEBUG_TYPE

DEBUG_TYPE

Definition at line 74 of file GCNPreRAOptimizations.cpp.

◆ false

Pre RA false

Definition at line 75 of file GCNPreRAOptimizations.cpp.

◆ optimizations

Pre RA optimizations

Definition at line 74 of file GCNPreRAOptimizations.cpp.