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R600: Add support for SET*_DX10 instructions

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These instructions compare two floating point values and return an
integer true (-1) or false (0) value.

When compiling code generated by the Mesa GLSL frontend, the SET*_DX10
instructions save us four instructions for most branch decisions that
use floating-point comparisons.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174609 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2013-02-07 14:02:35 +00:00
parent 2a77cf7f47
commit 1234c9be42
5 changed files with 281 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
lib/Target/R600/R600ISelLowering.cpp
View File

@ -90,7 +90,9 @@ R600TargetLowering::R600TargetLowering(TargetMachine &TM) :
setOperationAction(ISD::FrameIndex, MVT::i32, Custom);
setTargetDAGCombine(ISD::FP_ROUND);
setTargetDAGCombine(ISD::FP_TO_SINT);
setTargetDAGCombine(ISD::EXTRACT_VECTOR_ELT);
setTargetDAGCombine(ISD::SELECT_CC);
setSchedulingPreference(Sched::VLIW);
}
@ -670,9 +672,12 @@ SDValue R600TargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const
}
// Try to lower to a SET* instruction:
// We need all the operands of SELECT_CC to have the same value type, so if
// necessary we need to change True and False to be the same type as LHS and
// RHS, and then convert the result of the select_cc back to the correct type.
//
// CompareVT == MVT::f32 and VT == MVT::i32 is supported by the hardware,
// but for the other case where CompareVT != VT, all operands of
// SELECT_CC need to have the same value type, so we need to change True and
// False to be the same type as LHS and RHS, and then convert the result of
// the select_cc back to the correct type.
// Move hardware True/False values to the correct operand.
if (isHWTrueValue(False) && isHWFalseValue(True)) {
@ -682,32 +687,17 @@ SDValue R600TargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const
}
if (isHWTrueValue(True) && isHWFalseValue(False)) {
if (CompareVT != VT) {
if (VT == MVT::f32 && CompareVT == MVT::i32) {
SDValue Boolean = DAG.getNode(ISD::SELECT_CC, DL, CompareVT,
LHS, RHS,
DAG.getConstant(-1, MVT::i32),
DAG.getConstant(0, MVT::i32),
CC);
// Convert integer values of true (-1) and false (0) to fp values of
// true (1.0f) and false (0.0f).
SDValue LSB = DAG.getNode(ISD::AND, DL, MVT::i32, Boolean,
DAG.getConstant(1, MVT::i32));
return DAG.getNode(ISD::UINT_TO_FP, DL, VT, LSB);
} else if (VT == MVT::i32 && CompareVT == MVT::f32) {
SDValue BoolAsFlt = DAG.getNode(ISD::SELECT_CC, DL, CompareVT,
LHS, RHS,
DAG.getConstantFP(1.0f, MVT::f32),
DAG.getConstantFP(0.0f, MVT::f32),
CC);
// Convert fp values of true (1.0f) and false (0.0f) to integer values
// of true (-1) and false (0).
SDValue Neg = DAG.getNode(ISD::FNEG, DL, MVT::f32, BoolAsFlt);
return DAG.getNode(ISD::FP_TO_SINT, DL, VT, Neg);
} else {
// I don't think there will be any other type pairings.
assert(!"Unhandled operand type parings in SELECT_CC");
}
if (CompareVT != VT && VT == MVT::f32 && CompareVT == MVT::i32) {
SDValue Boolean = DAG.getNode(ISD::SELECT_CC, DL, CompareVT,
LHS, RHS,
DAG.getConstant(-1, MVT::i32),
DAG.getConstant(0, MVT::i32),
CC);
// Convert integer values of true (-1) and false (0) to fp values of
// true (1.0f) and false (0.0f).
SDValue LSB = DAG.getNode(ISD::AND, DL, MVT::i32, Boolean,
DAG.getConstant(1, MVT::i32));
return DAG.getNode(ISD::UINT_TO_FP, DL, VT, LSB);
} else {
// This SELECT_CC is already legal.
return DAG.getNode(ISD::SELECT_CC, DL, VT, LHS, RHS, True, False, CC);
@ -1128,6 +1118,35 @@ SDValue R600TargetLowering::PerformDAGCombine(SDNode *N,
}
break;
}
// (i32 fp_to_sint (fneg (select_cc f32, f32, 1.0, 0.0 cc))) ->
// (i32 select_cc f32, f32, -1, 0 cc)
//
// Mesa's GLSL frontend generates the above pattern a lot and we can lower
// this to one of the SET*_DX10 instructions.
case ISD::FP_TO_SINT: {
SDValue FNeg = N->getOperand(0);
if (FNeg.getOpcode() != ISD::FNEG) {
return SDValue();
}
SDValue SelectCC = FNeg.getOperand(0);
if (SelectCC.getOpcode() != ISD::SELECT_CC ||
SelectCC.getOperand(0).getValueType() != MVT::f32 || // LHS
SelectCC.getOperand(2).getValueType() != MVT::f32 || // True
!isHWTrueValue(SelectCC.getOperand(2)) ||
!isHWFalseValue(SelectCC.getOperand(3))) {
return SDValue();
}
return DAG.getNode(ISD::SELECT_CC, N->getDebugLoc(), N->getValueType(0),
SelectCC.getOperand(0), // LHS
SelectCC.getOperand(1), // RHS
DAG.getConstant(-1, MVT::i32), // True
DAG.getConstant(0, MVT::i32), // Flase
SelectCC.getOperand(4)); // CC
break;
}
// Extract_vec (Build_vector) generated by custom lowering
// also needs to be customly combined
case ISD::EXTRACT_VECTOR_ELT: {
@ -1147,6 +1166,37 @@ SDValue R600TargetLowering::PerformDAGCombine(SDNode *N,
}
}
}
case ISD::SELECT_CC: {
// fold selectcc (selectcc x, y, a, b, cc), b, a, b, seteq ->
// selectcc x, y, a, b, inv(cc)
SDValue LHS = N->getOperand(0);
if (LHS.getOpcode() != ISD::SELECT_CC) {
return SDValue();
}
SDValue RHS = N->getOperand(1);
SDValue True = N->getOperand(2);
SDValue False = N->getOperand(3);
if (LHS.getOperand(2).getNode() != True.getNode() ||
LHS.getOperand(3).getNode() != False.getNode() ||
RHS.getNode() != False.getNode() ||
cast<CondCodeSDNode>(N->getOperand(4))->get() != ISD::SETEQ) {
return SDValue();
}
ISD::CondCode CCOpcode = cast<CondCodeSDNode>(LHS->getOperand(4))->get();
CCOpcode = ISD::getSetCCInverse(
CCOpcode, LHS.getOperand(0).getValueType().isInteger());
return DAG.getSelectCC(N->getDebugLoc(),
LHS.getOperand(0),
LHS.getOperand(1),
LHS.getOperand(2),
LHS.getOperand(3),
CCOpcode);
}
}
return SDValue();
}

52
lib/Target/R600/R600Instructions.td
View File

@ -711,6 +711,34 @@ def SNE : R600_2OP <
COND_NE))]
>;
def SETE_DX10 : R600_2OP <
0xC, "SETE_DX10",
[(set R600_Reg32:$dst,
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, (i32 -1), (i32 0),
COND_EQ))]
>;
def SETGT_DX10 : R600_2OP <
0xD, "SETGT_DX10",
[(set R600_Reg32:$dst,
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, (i32 -1), (i32 0),
COND_GT))]
>;
def SETGE_DX10 : R600_2OP <
0xE, "SETGE_DX10",
[(set R600_Reg32:$dst,
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, (i32 -1), (i32 0),
COND_GE))]
>;
def SETNE_DX10 : R600_2OP <
0xF, "SETNE_DX10",
[(set R600_Reg32:$dst,
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, (i32 -1), (i32 0),
COND_NE))]
>;
def FRACT : R600_1OP_Helper <0x10, "FRACT", AMDGPUfract>;
def TRUNC : R600_1OP_Helper <0x11, "TRUNC", int_AMDGPU_trunc>;
def CEIL : R600_1OP_Helper <0x12, "CEIL", fceil>;
@ -1772,6 +1800,18 @@ def : Pat <
(SGE R600_Reg32:$src1, R600_Reg32:$src0)
>;
// SETGT_DX10 reverse args
def : Pat <
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, -1, 0, COND_LT),
(SETGT_DX10 R600_Reg32:$src1, R600_Reg32:$src0)
>;
// SETGE_DX10 reverse args
def : Pat <
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, -1, 0, COND_LE),
(SETGE_DX10 R600_Reg32:$src1, R600_Reg32:$src0)
>;
// SETGT_INT reverse args
def : Pat <
(selectcc (i32 R600_Reg32:$src0), R600_Reg32:$src1, -1, 0, SETLT),
@ -1810,12 +1850,24 @@ def : Pat <
(SETE R600_Reg32:$src0, R600_Reg32:$src1)
>;
//SETE_DX10 - 'true if ordered'
def : Pat <
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, -1, 0, SETO),
(SETE_DX10 R600_Reg32:$src0, R600_Reg32:$src1)
>;
//SNE - 'true if unordered'
def : Pat <
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, FP_ONE, FP_ZERO, SETUO),
(SNE R600_Reg32:$src0, R600_Reg32:$src1)
>;
//SETNE_DX10 - 'true if ordered'
def : Pat <
(selectcc (f32 R600_Reg32:$src0), R600_Reg32:$src1, -1, 0, SETUO),
(SETNE_DX10 R600_Reg32:$src0, R600_Reg32:$src1)
>;
def : Extract_Element <f32, v4f32, R600_Reg128, 0, sel_x>;
def : Extract_Element <f32, v4f32, R600_Reg128, 1, sel_y>;
def : Extract_Element <f32, v4f32, R600_Reg128, 2, sel_z>;

4
test/CodeGen/R600/fcmp.ll
View File

@ -1,8 +1,6 @@
;RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
;CHECK: SETE T{{[0-9]+\.[XYZW], T[0-9]+\.[XYZW], T[0-9]+\.[XYZW]}}
;CHECK: MOV T{{[0-9]+\.[XYZW], -T[0-9]+\.[XYZW]}}
;CHECK: FLT_TO_INT T{{[0-9]+\.[XYZW], T[0-9]+\.[XYZW]}}
;CHECK: SETE_DX10 T{{[0-9]+\.[XYZW], T[0-9]+\.[XYZW], T[0-9]+\.[XYZW]}}
define void @test(i32 addrspace(1)* %out, float addrspace(1)* %in) {
entry:

137
test/CodeGen/R600/set-dx10.ll Normal file
View File

@ -0,0 +1,137 @@
; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
; These tests check that floating point comparisons which are used by select
; to store integer true (-1) and false (0) values are lowered to one of the
; SET*DX10 instructions.
; CHECK: @fcmp_une_select_fptosi
; CHECK: SETNE_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_une_select_fptosi(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp une float %in, 5.0
%1 = select i1 %0, float 1.000000e+00, float 0.000000e+00
%2 = fsub float -0.000000e+00, %1
%3 = fptosi float %2 to i32
store i32 %3, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_une_select_i32
; CHECK: SETNE_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_une_select_i32(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp une float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ueq_select_fptosi
; CHECK: SETE_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_ueq_select_fptosi(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ueq float %in, 5.0
%1 = select i1 %0, float 1.000000e+00, float 0.000000e+00
%2 = fsub float -0.000000e+00, %1
%3 = fptosi float %2 to i32
store i32 %3, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ueq_select_i32
; CHECK: SETE_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_ueq_select_i32(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ueq float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ugt_select_fptosi
; CHECK: SETGT_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_ugt_select_fptosi(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ugt float %in, 5.0
%1 = select i1 %0, float 1.000000e+00, float 0.000000e+00
%2 = fsub float -0.000000e+00, %1
%3 = fptosi float %2 to i32
store i32 %3, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ugt_select_i32
; CHECK: SETGT_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_ugt_select_i32(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ugt float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_uge_select_fptosi
; CHECK: SETGE_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_uge_select_fptosi(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp uge float %in, 5.0
%1 = select i1 %0, float 1.000000e+00, float 0.000000e+00
%2 = fsub float -0.000000e+00, %1
%3 = fptosi float %2 to i32
store i32 %3, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_uge_select_i32
; CHECK: SETGE_DX10 T{{[0-9]+\.[XYZW]}}, T{{[0-9]+\.[XYZW]}}, literal.x, 1084227584(5.000000e+00)
define void @fcmp_uge_select_i32(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp uge float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ule_select_fptosi
; CHECK: SETGE_DX10 T{{[0-9]+\.[XYZW]}}, literal.x, T{{[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @fcmp_ule_select_fptosi(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ule float %in, 5.0
%1 = select i1 %0, float 1.000000e+00, float 0.000000e+00
%2 = fsub float -0.000000e+00, %1
%3 = fptosi float %2 to i32
store i32 %3, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ule_select_i32
; CHECK: SETGE_DX10 T{{[0-9]+\.[XYZW]}}, literal.x, T{{[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @fcmp_ule_select_i32(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ule float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ult_select_fptosi
; CHECK: SETGT_DX10 T{{[0-9]+\.[XYZW]}}, literal.x, T{{[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @fcmp_ult_select_fptosi(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ult float %in, 5.0
%1 = select i1 %0, float 1.000000e+00, float 0.000000e+00
%2 = fsub float -0.000000e+00, %1
%3 = fptosi float %2 to i32
store i32 %3, i32 addrspace(1)* %out
ret void
}
; CHECK: @fcmp_ult_select_i32
; CHECK: SETGT_DX10 T{{[0-9]+\.[XYZW]}}, literal.x, T{{[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @fcmp_ult_select_i32(i32 addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ult float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
ret void
}

24
test/CodeGen/R600/unsupported-cc.ll
View File

@ -24,21 +24,21 @@ entry:
; CHECK: @ult_float
; CHECK: SETGT T{{[0-9]+\.[XYZW]}}, literal.x, {{T[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @ult_float(i32 addrspace(1)* %out, float %in) {
define void @ult_float(float addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ult float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
%1 = select i1 %0, float 1.0, float 0.0
store float %1, float addrspace(1)* %out
ret void
}
; CHECK: @olt
; CHECK: SETGT T{{[0-9]+\.[XYZW]}}, literal.x, {{T[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @olt(i32 addrspace(1)* %out, float %in) {
define void @olt(float addrspace(1)* %out, float %in) {
entry:
%0 = fcmp olt float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
%1 = select i1 %0, float 1.0, float 0.0
store float %1, float addrspace(1)* %out
ret void
}
@ -64,20 +64,20 @@ entry:
; CHECK: @ule_float
; CHECK: SETGE T{{[0-9]+\.[XYZW]}}, literal.x, {{T[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @ule_float(i32 addrspace(1)* %out, float %in) {
define void @ule_float(float addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ule float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
%1 = select i1 %0, float 1.0, float 0.0
store float %1, float addrspace(1)* %out
ret void
}
; CHECK: @ole
; CHECK: SETGE T{{[0-9]+\.[XYZW]}}, literal.x, {{T[0-9]+\.[XYZW]}}, 1084227584(5.000000e+00)
define void @ole(i32 addrspace(1)* %out, float %in) {
define void @ole(float addrspace(1)* %out, float %in) {
entry:
%0 = fcmp ole float %in, 5.0
%1 = select i1 %0, i32 -1, i32 0
store i32 %1, i32 addrspace(1)* %out
%1 = select i1 %0, float 1.0, float 0.0
store float %1, float addrspace(1)* %out
ret void
}