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[ARM] Add a register class for GPR pairs without SP and use it. NFCI 

Summary:
Currently Thumb2InstrInfo.cpp uses a register class which is
auto-generated by tablegen. Such approach is fragile because
auto-generated classes might change when other register classes are
added. For example, before https://reviews.llvm.org/D62667
we were using GPRPair_with_gsub_1_in_rGPRRegClass, but had to
change it to GPRPair_with_gsub_1_in_GPRwithAPSRnospRegClass
because the former class stopped being generated (this did not change
the functionality though).

This patch adds a register class consisting of even-odd GPR register
pairs from (R0, R1) to (R10, R11), which excludes (R12, SP) and uses
it in Thumb2InstrInfo.cpp instead of
GPRPair_with_gsub_1_in_GPRwithAPSRnospRegClass.

Reviewers: ostannard, simon_tatham, dmgreen, efriedma

Reviewed By: simon_tatham

Subscribers: kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69026

llvm-svn: 374990
This commit is contained in:
Mikhail Maltsev 2019-10-16 10:40:57 +00:00
parent cfee2efc57
commit 95b5d459a0
3 changed files with 15 additions and 8 deletions
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16
llvm/lib/Target/ARM/ARMRegisterInfo.td
View File

@ -486,12 +486,20 @@ def DPair : RegisterClass<"ARM", [v16i8, v8i16, v4i32, v2i64, v4f32, v2f64],
// Pseudo-registers representing even-odd pairs of GPRs from R1 to R13/SP.
// These are needed by instructions (e.g. ldrexd/strexd) requiring even-odd GPRs.
def Tuples2R : RegisterTuples<[gsub_0, gsub_1],
[(add R0, R2, R4, R6, R8, R10, R12),
(add R1, R3, R5, R7, R9, R11, SP)]>;
def Tuples2Rnosp : RegisterTuples<[gsub_0, gsub_1],
[(add R0, R2, R4, R6, R8, R10),
(add R1, R3, R5, R7, R9, R11)]>;
def Tuples2Rsp : RegisterTuples<[gsub_0, gsub_1],
[(add R12), (add SP)]>;
// Register class representing a pair of even-odd GPRs.
def GPRPair : RegisterClass<"ARM", [untyped], 64, (add Tuples2R)> {
def GPRPair : RegisterClass<"ARM", [untyped], 64, (add Tuples2Rnosp, Tuples2Rsp)> {
let Size = 64; // 2 x 32 bits, we have no predefined type of that size.
}
// Register class representing a pair of even-odd GPRs, except (R12, SP).
def GPRPairnosp : RegisterClass<"ARM", [untyped], 64, (add Tuples2Rnosp)> {
let Size = 64; // 2 x 32 bits, we have no predefined type of that size.
}

5
llvm/lib/Target/ARM/Thumb2InstrInfo.cpp
View File

@ -161,7 +161,7 @@ storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
// otherwise).
if (Register::isVirtualRegister(SrcReg)) {
MachineRegisterInfo *MRI = &MF.getRegInfo();
MRI->constrainRegClass(SrcReg, &ARM::GPRPair_with_gsub_1_in_GPRwithAPSRnospRegClass);
MRI->constrainRegClass(SrcReg, &ARM::GPRPairnospRegClass);
}
MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(ARM::t2STRDi8));
@ -202,8 +202,7 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
// otherwise).
if (Register::isVirtualRegister(DestReg)) {
MachineRegisterInfo *MRI = &MF.getRegInfo();
MRI->constrainRegClass(DestReg,
&ARM::GPRPair_with_gsub_1_in_GPRwithAPSRnospRegClass);
MRI->constrainRegClass(DestReg, &ARM::GPRPairnospRegClass);
}
MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(ARM::t2LDRDi8));

2
llvm/test/CodeGen/ARM/ipra-reg-usage.ll
View File

@ -6,7 +6,7 @@ target triple = "armv7-eabi"
declare void @bar1()
define void @foo()#0 {
; CHECK: foo Clobbered Registers: $apsr $apsr_nzcv $cpsr $fpcxtns $fpcxts $fpexc $fpinst $fpscr $fpscr_nzcv $fpscr_nzcvqc $fpsid $itstate $pc $sp $spsr $vpr $zr $d0 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d16 $d17 $d18 $d19 $d20 $d21 $d22 $d23 $d24 $d25 $d26 $d27 $d28 $d29 $d30 $d31 $fpinst2 $mvfr0 $mvfr1 $mvfr2 $p0 $q0 $q1 $q2 $q3 $q8 $q9 $q10 $q11 $q12 $q13 $q14 $q15 $r0 $r1 $r2 $r3 $r12 $s0 $s1 $s2 $s3 $s4 $s5 $s6 $s7 $s8 $s9 $s10 $s11 $s12 $s13 $s14 $s15 $d0_d2 $d1_d3 $d2_d4 $d3_d5 $d4_d6 $d5_d7 $d6_d8 $d7_d9 $d14_d16 $d15_d17 $d16_d18 $d17_d19 $d18_d20 $d19_d21 $d20_d22 $d21_d23 $d22_d24 $d23_d25 $d24_d26 $d25_d27 $d26_d28 $d27_d29 $d28_d30 $d29_d31 $q0_q1 $q1_q2 $q2_q3 $q3_q4 $q7_q8 $q8_q9 $q9_q10 $q10_q11 $q11_q12 $q12_q13 $q13_q14 $q14_q15 $q0_q1_q2_q3 $q1_q2_q3_q4 $q2_q3_q4_q5 $q3_q4_q5_q6 $q5_q6_q7_q8 $q6_q7_q8_q9 $q7_q8_q9_q10 $q8_q9_q10_q11 $q9_q10_q11_q12 $q10_q11_q12_q13 $q11_q12_q13_q14 $q12_q13_q14_q15 $r12_sp $r0_r1 $r2_r3 $d0_d1_d2 $d1_d2_d3 $d2_d3_d4 $d3_d4_d5 $d4_d5_d6 $d5_d6_d7 $d6_d7_d8 $d7_d8_d9 $d14_d15_d16 $d15_d16_d17 $d16_d17_d18 $d17_d18_d19 $d18_d19_d20 $d19_d20_d21 $d20_d21_d22 $d21_d22_d23 $d22_d23_d24 $d23_d24_d25 $d24_d25_d26 $d25_d26_d27 $d26_d27_d28 $d27_d28_d29 $d28_d29_d30 $d29_d30_d31 $d0_d2_d4 $d1_d3_d5 $d2_d4_d6 $d3_d5_d7 $d4_d6_d8 $d5_d7_d9 $d6_d8_d10 $d7_d9_d11 $d12_d14_d16 $d13_d15_d17 $d14_d16_d18 $d15_d17_d19 $d16_d18_d20 $d17_d19_d21 $d18_d20_d22 $d19_d21_d23 $d20_d22_d24 $d21_d23_d25 $d22_d24_d26 $d23_d25_d27 $d24_d26_d28 $d25_d27_d29 $d26_d28_d30 $d27_d29_d31 $d0_d2_d4_d6 $d1_d3_d5_d7 $d2_d4_d6_d8 $d3_d5_d7_d9 $d4_d6_d8_d10 $d5_d7_d9_d11 $d6_d8_d10_d12 $d7_d9_d11_d13 $d10_d12_d14_d16 $d11_d13_d15_d17 $d12_d14_d16_d18 $d13_d15_d17_d19 $d14_d16_d18_d20 $d15_d17_d19_d21 $d16_d18_d20_d22 $d17_d19_d21_d23 $d18_d20_d22_d24 $d19_d21_d23_d25 $d20_d22_d24_d26 $d21_d23_d25_d27 $d22_d24_d26_d28 $d23_d25_d27_d29 $d24_d26_d28_d30 $d25_d27_d29_d31 $d1_d2 $d3_d4 $d5_d6 $d7_d8 $d15_d16 $d17_d18 $d19_d20 $d21_d22 $d23_d24 $d25_d26 $d27_d28 $d29_d30 $d1_d2_d3_d4 $d3_d4_d5_d6 $d5_d6_d7_d8 $d7_d8_d9_d10 $d13_d14_d15_d16 $d15_d16_d17_d18 $d17_d18_d19_d20 $d19_d20_d21_d22 $d21_d22_d23_d24 $d23_d24_d25_d26 $d25_d26_d27_d28 $d27_d28_d29_d30
; CHECK: foo Clobbered Registers: $apsr $apsr_nzcv $cpsr $fpcxtns $fpcxts $fpexc $fpinst $fpscr $fpscr_nzcv $fpscr_nzcvqc $fpsid $itstate $pc $sp $spsr $vpr $zr $d0 $d1 $d2 $d3 $d4 $d5 $d6 $d7 $d16 $d17 $d18 $d19 $d20 $d21 $d22 $d23 $d24 $d25 $d26 $d27 $d28 $d29 $d30 $d31 $fpinst2 $mvfr0 $mvfr1 $mvfr2 $p0 $q0 $q1 $q2 $q3 $q8 $q9 $q10 $q11 $q12 $q13 $q14 $q15 $r0 $r1 $r2 $r3 $r12 $s0 $s1 $s2 $s3 $s4 $s5 $s6 $s7 $s8 $s9 $s10 $s11 $s12 $s13 $s14 $s15 $d0_d2 $d1_d3 $d2_d4 $d3_d5 $d4_d6 $d5_d7 $d6_d8 $d7_d9 $d14_d16 $d15_d17 $d16_d18 $d17_d19 $d18_d20 $d19_d21 $d20_d22 $d21_d23 $d22_d24 $d23_d25 $d24_d26 $d25_d27 $d26_d28 $d27_d29 $d28_d30 $d29_d31 $q0_q1 $q1_q2 $q2_q3 $q3_q4 $q7_q8 $q8_q9 $q9_q10 $q10_q11 $q11_q12 $q12_q13 $q13_q14 $q14_q15 $q0_q1_q2_q3 $q1_q2_q3_q4 $q2_q3_q4_q5 $q3_q4_q5_q6 $q5_q6_q7_q8 $q6_q7_q8_q9 $q7_q8_q9_q10 $q8_q9_q10_q11 $q9_q10_q11_q12 $q10_q11_q12_q13 $q11_q12_q13_q14 $q12_q13_q14_q15 $r0_r1 $r2_r3 $r12_sp $d0_d1_d2 $d1_d2_d3 $d2_d3_d4 $d3_d4_d5 $d4_d5_d6 $d5_d6_d7 $d6_d7_d8 $d7_d8_d9 $d14_d15_d16 $d15_d16_d17 $d16_d17_d18 $d17_d18_d19 $d18_d19_d20 $d19_d20_d21 $d20_d21_d22 $d21_d22_d23 $d22_d23_d24 $d23_d24_d25 $d24_d25_d26 $d25_d26_d27 $d26_d27_d28 $d27_d28_d29 $d28_d29_d30 $d29_d30_d31 $d0_d2_d4 $d1_d3_d5 $d2_d4_d6 $d3_d5_d7 $d4_d6_d8 $d5_d7_d9 $d6_d8_d10 $d7_d9_d11 $d12_d14_d16 $d13_d15_d17 $d14_d16_d18 $d15_d17_d19 $d16_d18_d20 $d17_d19_d21 $d18_d20_d22 $d19_d21_d23 $d20_d22_d24 $d21_d23_d25 $d22_d24_d26 $d23_d25_d27 $d24_d26_d28 $d25_d27_d29 $d26_d28_d30 $d27_d29_d31 $d0_d2_d4_d6 $d1_d3_d5_d7 $d2_d4_d6_d8 $d3_d5_d7_d9 $d4_d6_d8_d10 $d5_d7_d9_d11 $d6_d8_d10_d12 $d7_d9_d11_d13 $d10_d12_d14_d16 $d11_d13_d15_d17 $d12_d14_d16_d18 $d13_d15_d17_d19 $d14_d16_d18_d20 $d15_d17_d19_d21 $d16_d18_d20_d22 $d17_d19_d21_d23 $d18_d20_d22_d24 $d19_d21_d23_d25 $d20_d22_d24_d26 $d21_d23_d25_d27 $d22_d24_d26_d28 $d23_d25_d27_d29 $d24_d26_d28_d30 $d25_d27_d29_d31 $d1_d2 $d3_d4 $d5_d6 $d7_d8 $d15_d16 $d17_d18 $d19_d20 $d21_d22 $d23_d24 $d25_d26 $d27_d28 $d29_d30 $d1_d2_d3_d4 $d3_d4_d5_d6 $d5_d6_d7_d8 $d7_d8_d9_d10 $d13_d14_d15_d16 $d15_d16_d17_d18 $d17_d18_d19_d20 $d19_d20_d21_d22 $d21_d22_d23_d24 $d23_d24_d25_d26 $d25_d26_d27_d28 $d27_d28_d29_d30
call void @bar1()
call void @bar2()
ret void