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R600/SI: Optimize SI_KILL for constant operands
If the SI_KILL operand is constant, we can either clear the exec mask if the operand is negative, or do nothing otherwise. Reviewed-by: Tom Stellard <thomas.stellard@amd.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202337 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1333,7 +1333,7 @@ def SI_END_CF : InstSI <
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def SI_KILL : InstSI <
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(outs),
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(ins VReg_32:$src),
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(ins VSrc_32:$src),
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"SI_KILL $src",
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[(int_AMDGPU_kill f32:$src)]
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>;
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@ -1425,7 +1425,7 @@ def : Pat<
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def : Pat <
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(int_AMDGPU_kilp),
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(SI_KILL (V_MOV_B32_e32 0xbf800000))
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(SI_KILL 0xbf800000)
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>;
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/* int_SI_vs_load_input */
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@ -55,6 +55,7 @@
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/IR/Constants.h"
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using namespace llvm;
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@ -294,6 +295,7 @@ void SILowerControlFlowPass::Branch(MachineInstr &MI) {
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void SILowerControlFlowPass::Kill(MachineInstr &MI) {
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MachineBasicBlock &MBB = *MI.getParent();
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DebugLoc DL = MI.getDebugLoc();
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const MachineOperand &Op = MI.getOperand(0);
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// Kill is only allowed in pixel / geometry shaders
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assert(MBB.getParent()->getInfo<SIMachineFunctionInfo>()->ShaderType ==
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@ -301,10 +303,19 @@ void SILowerControlFlowPass::Kill(MachineInstr &MI) {
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MBB.getParent()->getInfo<SIMachineFunctionInfo>()->ShaderType ==
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ShaderType::GEOMETRY);
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// Clear this pixel from the exec mask if the operand is negative
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BuildMI(MBB, &MI, DL, TII->get(AMDGPU::V_CMPX_LE_F32_e32), AMDGPU::VCC)
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.addImm(0)
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.addOperand(MI.getOperand(0));
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// Clear this thread from the exec mask if the operand is negative
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if ((Op.isImm() || Op.isFPImm())) {
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// Constant operand: Set exec mask to 0 or do nothing
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if (Op.isImm() ? (Op.getImm() & 0x80000000) :
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Op.getFPImm()->isNegative()) {
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BuildMI(MBB, &MI, DL, TII->get(AMDGPU::S_MOV_B64), AMDGPU::EXEC)
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.addImm(0);
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}
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} else {
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BuildMI(MBB, &MI, DL, TII->get(AMDGPU::V_CMPX_LE_F32_e32), AMDGPU::VCC)
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.addImm(0)
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.addOperand(Op);
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}
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MI.eraseFromParent();
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}
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@ -1,13 +1,17 @@
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; RUN: llc < %s -march=r600 -mcpu=verde -verify-machineinstrs | FileCheck --check-prefix=SI %s
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; SI-LABEL: @kill_gs
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; SI: V_CMPX_LE_F32
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; SI-LABEL: @kill_gs_const
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; SI-NOT: V_CMPX_LE_F32
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; SI: S_MOV_B64 exec, 0
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define void @kill_gs() #0 {
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define void @kill_gs_const() #0 {
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main_body:
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%0 = icmp ule i32 0, 3
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%1 = select i1 %0, float 1.000000e+00, float -1.000000e+00
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call void @llvm.AMDGPU.kill(float %1)
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%2 = icmp ule i32 3, 0
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%3 = select i1 %2, float 1.000000e+00, float -1.000000e+00
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call void @llvm.AMDGPU.kill(float %3)
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ret void
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}
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