[MIPS GlobalISel] Add floating point register bank

[Petar.Avramovic]

Summary

Add floating point register bank for MIPS32.
Implement getRegBankFromRegClass for float register classes.

[atanasyan]

LGTM

llvm/trunk/lib/Target/Mips/MipsRegisterBankInfo.cpp

const RegisterBank &MipsRegisterBankInfo::getRegBankFromRegClass(
   case Mips::GPR32RegClassID:
   case Mips::CPU16Regs_and_GPRMM16ZeroRegClassID:
   case Mips::GPRMM16MovePPairFirstRegClassID:
   case Mips::CPU16Regs_and_GPRMM16MovePPairSecondRegClassID:
   case Mips::GPRMM16MoveP_and_CPU16Regs_and_GPRMM16ZeroRegClassID:
   case Mips::GPRMM16MovePPairFirst_and_GPRMM16MovePPairSecondRegClassID:
   case Mips::SP32RegClassID:
     return getRegBank(Mips::GPRBRegBankID);
+  case Mips::FGRCCRegClassID:
+  case Mips::FGR64RegClassID:
+  case Mips::AFGR64RegClassID:
+  case Mips::AFGR64_and_OddSPRegClassID:
+    return getRegBank(Mips::FPRBRegBankID);
   default:
     llvm_unreachable("Register class not supported");
   }
 }
 
 const RegisterBankInfo::InstructionMapping &
 MipsRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
 

llvm/trunk/lib/Target/Mips/MipsRegisterBanks.td

 //===- MipsRegisterBank.td ---------------------------------*- tablegen -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 //
 //===----------------------------------------------------------------------===//
 
 def GPRBRegBank : RegisterBank<"GPRB", [GPR32]>;
+
+def FPRBRegBank : RegisterBank<"FPRB", [FGR64, AFGR64]>;

llvm/trunk/test/CodeGen/Mips/GlobalISel/regbankselect/float_args.mir

+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -run-pass=regbankselect -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP32
+# RUN: llc -O0 -mtriple=mipsel-linux-gnu -mattr=+fp64,+mips32r2 -run-pass=regbankselect -verify-machineinstrs %s -o - | FileCheck %s -check-prefixes=FP64
+
+--- |
+
+  define void @float_in_fpr() {entry: ret void}
+  define void @double_in_fpr() {entry: ret void}
+  define void @float_in_gpr() {entry: ret void}
+  define void @double_in_gpr() {entry: ret void}
+  define void @call_float_in_fpr() {entry: ret void}
+  define void @call_double_in_fpr() {entry: ret void}
+  define void @call_float_in_gpr() {entry: ret void}
+  define void @call_double_in_gpr() {entry: ret void}
+
+...
+---
+name:            float_in_fpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $f12, $f14
+
+    ; FP32-LABEL: name: float_in_fpr
+    ; FP32: liveins: $f12, $f14
+    ; FP32: [[COPY:%[0-9]+]]:fprb(s32) = COPY $f14
+    ; FP32: $f0 = COPY [[COPY]](s32)
+    ; FP32: RetRA implicit $f0
+    ; FP64-LABEL: name: float_in_fpr
+    ; FP64: liveins: $f12, $f14
+    ; FP64: [[COPY:%[0-9]+]]:fprb(s32) = COPY $f14
+    ; FP64: $f0 = COPY [[COPY]](s32)
+    ; FP64: RetRA implicit $f0
+    %1:_(s32) = COPY $f14
+    $f0 = COPY %1(s32)
+    RetRA implicit $f0
+
+...
+---
+name:            double_in_fpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $d6, $d7
+
+    ; FP32-LABEL: name: double_in_fpr
+    ; FP32: liveins: $d6, $d7
+    ; FP32: [[COPY:%[0-9]+]]:fprb(s64) = COPY $d7
+    ; FP32: $d0 = COPY [[COPY]](s64)
+    ; FP32: RetRA implicit $d0
+    ; FP64-LABEL: name: double_in_fpr
+    ; FP64: liveins: $d6, $d7
+    ; FP64: [[COPY:%[0-9]+]]:fprb(s64) = COPY $d7
+    ; FP64: $d0 = COPY [[COPY]](s64)
+    ; FP64: RetRA implicit $d0
+    %1:_(s64) = COPY $d7
+    $d0 = COPY %1(s64)
+    RetRA implicit $d0
+
+...
+---
+name:            float_in_gpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0, $a1
+
+    ; FP32-LABEL: name: float_in_gpr
+    ; FP32: liveins: $a0, $a1
+    ; FP32: [[MTC1_:%[0-9]+]]:fgr32(s32) = MTC1 $a1
+    ; FP32: $f0 = COPY [[MTC1_]](s32)
+    ; FP32: RetRA implicit $f0
+    ; FP64-LABEL: name: float_in_gpr
+    ; FP64: liveins: $a0, $a1
+    ; FP64: [[MTC1_:%[0-9]+]]:fgr32(s32) = MTC1 $a1
+    ; FP64: $f0 = COPY [[MTC1_]](s32)
+    ; FP64: RetRA implicit $f0
+    %1:fgr32(s32) = MTC1 $a1
+    $f0 = COPY %1(s32)
+    RetRA implicit $f0
+
+...
+---
+name:            double_in_gpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0, $a2, $a3
+
+    ; FP32-LABEL: name: double_in_gpr
+    ; FP32: liveins: $a0, $a2, $a3
+    ; FP32: [[BuildPairF64_:%[0-9]+]]:afgr64(s64) = BuildPairF64 $a2, $a3
+    ; FP32: $d0 = COPY [[BuildPairF64_]](s64)
+    ; FP32: RetRA implicit $d0
+    ; FP64-LABEL: name: double_in_gpr
+    ; FP64: liveins: $a0, $a2, $a3
+    ; FP64: [[BuildPairF64_:%[0-9]+]]:afgr64(s64) = BuildPairF64 $a2, $a3
+    ; FP64: $d0 = COPY [[BuildPairF64_]](s64)
+    ; FP64: RetRA implicit $d0
+    %1:afgr64(s64) = BuildPairF64 $a2, $a3
+    $d0 = COPY %1(s64)
+    RetRA implicit $d0
+
+...
+---
+name:            call_float_in_fpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $f12, $f14
+
+    ; FP32-LABEL: name: call_float_in_fpr
+    ; FP32: liveins: $f12, $f14
+    ; FP32: [[COPY:%[0-9]+]]:fprb(s32) = COPY $f12
+    ; FP32: [[COPY1:%[0-9]+]]:fprb(s32) = COPY $f14
+    ; FP32: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $f12 = COPY [[COPY]](s32)
+    ; FP32: $f14 = COPY [[COPY1]](s32)
+    ; FP32: JAL @float_in_fpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $f12, implicit $f14, implicit-def $f0
+    ; FP32: [[COPY2:%[0-9]+]]:fprb(s32) = COPY $f0
+    ; FP32: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $f0 = COPY [[COPY2]](s32)
+    ; FP32: RetRA implicit $f0
+    ; FP64-LABEL: name: call_float_in_fpr
+    ; FP64: liveins: $f12, $f14
+    ; FP64: [[COPY:%[0-9]+]]:fprb(s32) = COPY $f12
+    ; FP64: [[COPY1:%[0-9]+]]:fprb(s32) = COPY $f14
+    ; FP64: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $f12 = COPY [[COPY]](s32)
+    ; FP64: $f14 = COPY [[COPY1]](s32)
+    ; FP64: JAL @float_in_fpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $f12, implicit $f14, implicit-def $f0
+    ; FP64: [[COPY2:%[0-9]+]]:fprb(s32) = COPY $f0
+    ; FP64: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $f0 = COPY [[COPY2]](s32)
+    ; FP64: RetRA implicit $f0
+    %0:_(s32) = COPY $f12
+    %1:_(s32) = COPY $f14
+    ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    $f12 = COPY %0(s32)
+    $f14 = COPY %1(s32)
+    JAL @float_in_fpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $f12, implicit $f14, implicit-def $f0
+    %2:_(s32) = COPY $f0
+    ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    $f0 = COPY %2(s32)
+    RetRA implicit $f0
+
+...
+---
+name:            call_double_in_fpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $d6, $d7
+
+    ; FP32-LABEL: name: call_double_in_fpr
+    ; FP32: liveins: $d6, $d7
+    ; FP32: [[COPY:%[0-9]+]]:fprb(s64) = COPY $d6
+    ; FP32: [[COPY1:%[0-9]+]]:fprb(s64) = COPY $d7
+    ; FP32: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $d6 = COPY [[COPY]](s64)
+    ; FP32: $d7 = COPY [[COPY1]](s64)
+    ; FP32: JAL @double_in_fpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $d6, implicit $d7, implicit-def $d0
+    ; FP32: [[COPY2:%[0-9]+]]:fprb(s64) = COPY $d0
+    ; FP32: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $d0 = COPY [[COPY2]](s64)
+    ; FP32: RetRA implicit $d0
+    ; FP64-LABEL: name: call_double_in_fpr
+    ; FP64: liveins: $d6, $d7
+    ; FP64: [[COPY:%[0-9]+]]:fprb(s64) = COPY $d6
+    ; FP64: [[COPY1:%[0-9]+]]:fprb(s64) = COPY $d7
+    ; FP64: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $d6 = COPY [[COPY]](s64)
+    ; FP64: $d7 = COPY [[COPY1]](s64)
+    ; FP64: JAL @double_in_fpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $d6, implicit $d7, implicit-def $d0
+    ; FP64: [[COPY2:%[0-9]+]]:fprb(s64) = COPY $d0
+    ; FP64: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $d0 = COPY [[COPY2]](s64)
+    ; FP64: RetRA implicit $d0
+    %0:_(s64) = COPY $d6
+    %1:_(s64) = COPY $d7
+    ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    $d6 = COPY %0(s64)
+    $d7 = COPY %1(s64)
+    JAL @double_in_fpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $d6, implicit $d7, implicit-def $d0
+    %2:_(s64) = COPY $d0
+    ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    $d0 = COPY %2(s64)
+    RetRA implicit $d0
+
+...
+---
+name:            call_float_in_gpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0, $a1
+
+    ; FP32-LABEL: name: call_float_in_gpr
+    ; FP32: liveins: $a0, $a1
+    ; FP32: [[COPY:%[0-9]+]]:gprb(s32) = COPY $a0
+    ; FP32: [[MTC1_:%[0-9]+]]:fgr32(s32) = MTC1 $a1
+    ; FP32: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $a0 = COPY [[COPY]](s32)
+    ; FP32: $a1 = MFC1 [[MTC1_]](s32)
+    ; FP32: JAL @float_in_gpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $a0, implicit-def $f0
+    ; FP32: [[COPY1:%[0-9]+]]:fprb(s32) = COPY $f0
+    ; FP32: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $f0 = COPY [[COPY1]](s32)
+    ; FP32: RetRA implicit $f0
+    ; FP64-LABEL: name: call_float_in_gpr
+    ; FP64: liveins: $a0, $a1
+    ; FP64: [[COPY:%[0-9]+]]:gprb(s32) = COPY $a0
+    ; FP64: [[MTC1_:%[0-9]+]]:fgr32(s32) = MTC1 $a1
+    ; FP64: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $a0 = COPY [[COPY]](s32)
+    ; FP64: $a1 = MFC1 [[MTC1_]](s32)
+    ; FP64: JAL @float_in_gpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $a0, implicit-def $f0
+    ; FP64: [[COPY1:%[0-9]+]]:fprb(s32) = COPY $f0
+    ; FP64: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $f0 = COPY [[COPY1]](s32)
+    ; FP64: RetRA implicit $f0
+    %0:_(s32) = COPY $a0
+    %1:fgr32(s32) = MTC1 $a1
+    ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    $a0 = COPY %0(s32)
+    $a1 = MFC1 %1(s32)
+    JAL @float_in_gpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $a0, implicit-def $f0
+    %2:_(s32) = COPY $f0
+    ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    $f0 = COPY %2(s32)
+    RetRA implicit $f0
+
+...
+---
+name:            call_double_in_gpr
+alignment:       2
+legalized:       true
+tracksRegLiveness: true
+body:             |
+  bb.1.entry:
+    liveins: $a0, $a2, $a3
+
+    ; FP32-LABEL: name: call_double_in_gpr
+    ; FP32: liveins: $a0, $a2, $a3
+    ; FP32: [[COPY:%[0-9]+]]:gprb(s32) = COPY $a0
+    ; FP32: [[BuildPairF64_:%[0-9]+]]:afgr64(s64) = BuildPairF64 $a2, $a3
+    ; FP32: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $a0 = COPY [[COPY]](s32)
+    ; FP32: $a3 = ExtractElementF64 [[BuildPairF64_]](s64), 1
+    ; FP32: $a2 = ExtractElementF64 [[BuildPairF64_]](s64), 0
+    ; FP32: JAL @double_in_gpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $a0, implicit-def $d0
+    ; FP32: [[COPY1:%[0-9]+]]:fprb(s64) = COPY $d0
+    ; FP32: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP32: $d0 = COPY [[COPY1]](s64)
+    ; FP32: RetRA implicit $d0
+    ; FP64-LABEL: name: call_double_in_gpr
+    ; FP64: liveins: $a0, $a2, $a3
+    ; FP64: [[COPY:%[0-9]+]]:gprb(s32) = COPY $a0
+    ; FP64: [[BuildPairF64_:%[0-9]+]]:afgr64(s64) = BuildPairF64 $a2, $a3
+    ; FP64: ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $a0 = COPY [[COPY]](s32)
+    ; FP64: $a3 = ExtractElementF64 [[BuildPairF64_]](s64), 1
+    ; FP64: $a2 = ExtractElementF64 [[BuildPairF64_]](s64), 0
+    ; FP64: JAL @double_in_gpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $a0, implicit-def $d0
+    ; FP64: [[COPY1:%[0-9]+]]:fprb(s64) = COPY $d0
+    ; FP64: ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    ; FP64: $d0 = COPY [[COPY1]](s64)
+    ; FP64: RetRA implicit $d0
+    %0:_(s32) = COPY $a0
+    %1:afgr64(s64) = BuildPairF64 $a2, $a3
+    ADJCALLSTACKDOWN 16, 0, implicit-def $sp, implicit $sp
+    $a0 = COPY %0(s32)
+    $a3 = ExtractElementF64 %1(s64), 1
+    $a2 = ExtractElementF64 %1(s64), 0
+    JAL @double_in_gpr, csr_o32, implicit-def $ra, implicit-def $sp, implicit $a0, implicit-def $d0
+    %2:_(s64) = COPY $d0
+    ADJCALLSTACKUP 16, 0, implicit-def $sp, implicit $sp
+    $d0 = COPY %2(s64)
+    RetRA implicit $d0
+
+...
+