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shader_jit: Load LOOPCOUNT_REG and LOOPINC 4 bit left-shifted

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This commit is contained in:
Jannik Vogel 2016-11-30 15:40:42 +01:00
parent 0423a38ab5
commit e2cb7d7833
1 changed files with 9 additions and 6 deletions
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15
src/video_core/shader/shader_jit_x64.cpp
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@ -102,11 +102,11 @@ static const X64Reg SETUP = R9;
/// The two 32-bit VS address offset registers set by the MOVA instruction /// The two 32-bit VS address offset registers set by the MOVA instruction
static const X64Reg ADDROFFS_REG_0 = R10; static const X64Reg ADDROFFS_REG_0 = R10;
static const X64Reg ADDROFFS_REG_1 = R11; static const X64Reg ADDROFFS_REG_1 = R11;
/// VS loop count register /// VS loop count register (Multiplied by 16)
static const X64Reg LOOPCOUNT_REG = R12; static const X64Reg LOOPCOUNT_REG = R12;
/// Current VS loop iteration number (we could probably use LOOPCOUNT_REG, but this quicker) /// Current VS loop iteration number (we could probably use LOOPCOUNT_REG, but this quicker)
static const X64Reg LOOPCOUNT = RSI; static const X64Reg LOOPCOUNT = RSI;
/// Number to increment LOOPCOUNT_REG by on each loop iteration /// Number to increment LOOPCOUNT_REG by on each loop iteration (Multiplied by 16)
static const X64Reg LOOPINC = RDI; static const X64Reg LOOPINC = RDI;
/// Result of the previous CMP instruction for the X-component comparison /// Result of the previous CMP instruction for the X-component comparison
static const X64Reg COND0 = R13; static const X64Reg COND0 = R13;
@ -718,15 +718,18 @@ void JitShader::Compile_LOOP(Instruction instr) {
looping = true; looping = true;
// This decodes the fields from the integer uniform at index instr.flow_control.int_uniform_id.
// The Y (LOOPCOUNT_REG) and Z (LOOPINC) component are kept multiplied by 16 (Left shifted by
// 4 bits) to be used as an offset into the 16-byte vector registers later
int offset = int offset =
ShaderSetup::UniformOffset(RegisterType::IntUniform, instr.flow_control.int_uniform_id); ShaderSetup::UniformOffset(RegisterType::IntUniform, instr.flow_control.int_uniform_id);
MOV(32, R(LOOPCOUNT), MDisp(SETUP, offset)); MOV(32, R(LOOPCOUNT), MDisp(SETUP, offset));
MOV(32, R(LOOPCOUNT_REG), R(LOOPCOUNT)); MOV(32, R(LOOPCOUNT_REG), R(LOOPCOUNT));
SHR(32, R(LOOPCOUNT_REG), Imm8(8)); SHR(32, R(LOOPCOUNT_REG), Imm8(4));
AND(32, R(LOOPCOUNT_REG), Imm32(0xff)); // Y-component is the start AND(32, R(LOOPCOUNT_REG), Imm32(0xFF0)); // Y-component is the start
MOV(32, R(LOOPINC), R(LOOPCOUNT)); MOV(32, R(LOOPINC), R(LOOPCOUNT));
SHR(32, R(LOOPINC), Imm8(16)); SHR(32, R(LOOPINC), Imm8(12));
MOVZX(32, 8, LOOPINC, R(LOOPINC)); // Z-component is the incrementer AND(32, R(LOOPINC), Imm32(0xFF0)); // Z-component is the incrementer
MOVZX(32, 8, LOOPCOUNT, R(LOOPCOUNT)); // X-component is iteration count MOVZX(32, 8, LOOPCOUNT, R(LOOPCOUNT)); // X-component is iteration count
ADD(32, R(LOOPCOUNT), Imm8(1)); // Iteration count is X-component + 1 ADD(32, R(LOOPCOUNT), Imm8(1)); // Iteration count is X-component + 1