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[LoongArch] Support PreserveMost calling convention (#154898)
This introduces the simplest implementation of the `PreserveMost` calling convention, under which registers `r4-r31` are preserved, with the exception of `r12-r15` (used by the PLT) and `r20-r21` (`r20` used by the tail calls). Related rust-lang/rust#145692
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‎llvm/docs/LangRef.rst

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@@ -415,6 +415,8 @@ added in the future:
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- On RISC-V the callee preserves x5-x31 except x6, x7 and x28 registers.
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- On LoongArch the callee preserves r4-r31 except r12-r15 and r20-r21 registers.
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The idea behind this convention is to support calls to runtime functions
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that have a hot path and a cold path. The hot path is usually a small piece
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of code that doesn't use many registers. The cold path might need to call out to

‎llvm/lib/Target/LoongArch/LoongArchCallingConv.td

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@@ -21,3 +21,7 @@ def CSR_ILP32D_LP64D
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// Needed for implementation of LoongArchRegisterInfo::getNoPreservedMask()
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def CSR_NoRegs : CalleeSavedRegs<(add)>;
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def CSR_MostRegs : CalleeSavedRegs<(add CSR_ILP32S_LP64S,
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(sequence "R%u", 4, 11),
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(sequence "R%u", 16, 19))>;

‎llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp

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@@ -7187,6 +7187,7 @@ SDValue LoongArchTargetLowering::LowerFormalArguments(
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llvm_unreachable("Unsupported calling convention");
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case CallingConv::C:
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case CallingConv::Fast:
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case CallingConv::PreserveMost:
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break;
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case CallingConv::GHC:
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if (!MF.getSubtarget().hasFeature(LoongArch::FeatureBasicF) ||

‎llvm/lib/Target/LoongArch/LoongArchRegisterInfo.cpp

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@@ -41,6 +41,8 @@ LoongArchRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
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if (MF->getFunction().getCallingConv() == CallingConv::GHC)
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return CSR_NoRegs_SaveList;
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if (MF->getFunction().getCallingConv() == CallingConv::PreserveMost)
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return CSR_MostRegs_SaveList;
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switch (Subtarget.getTargetABI()) {
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default:
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llvm_unreachable("Unrecognized ABI");
@@ -63,6 +65,8 @@ LoongArchRegisterInfo::getCallPreservedMask(const MachineFunction &MF,
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if (CC == CallingConv::GHC)
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return CSR_NoRegs_RegMask;
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if (CC == CallingConv::PreserveMost)
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return CSR_MostRegs_RegMask;
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switch (Subtarget.getTargetABI()) {
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default:
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llvm_unreachable("Unrecognized ABI");

‎llvm/test/CodeGen/LoongArch/calling-conv-preserve-most.ll

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@@ -0,0 +1,321 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=loongarch32 < %s | FileCheck %s -check-prefix=LA32
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; RUN: llc -mtriple=loongarch64 < %s | FileCheck %s -check-prefix=LA64
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; Check the PreserveMost calling convention works.
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declare void @standard_cc_func()
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declare preserve_mostcc void @preserve_mostcc_func()
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define preserve_mostcc void @preserve_mostcc1() nounwind {
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; LA32-LABEL: preserve_mostcc1:
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; LA32: # %bb.0: # %entry
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; LA32-NEXT: addi.w $sp, $sp, -64
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; LA32-NEXT: st.w $ra, $sp, 60 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a0, $sp, 56 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a1, $sp, 52 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a2, $sp, 48 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a3, $sp, 44 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a4, $sp, 40 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a5, $sp, 36 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a6, $sp, 32 # 4-byte Folded Spill
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; LA32-NEXT: st.w $a7, $sp, 28 # 4-byte Folded Spill
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; LA32-NEXT: st.w $t4, $sp, 24 # 4-byte Folded Spill
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; LA32-NEXT: st.w $t5, $sp, 20 # 4-byte Folded Spill
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; LA32-NEXT: st.w $t6, $sp, 16 # 4-byte Folded Spill
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; LA32-NEXT: st.w $t7, $sp, 12 # 4-byte Folded Spill
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; LA32-NEXT: bl standard_cc_func
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; LA32-NEXT: ld.w $t7, $sp, 12 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $t6, $sp, 16 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $t5, $sp, 20 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $t4, $sp, 24 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a7, $sp, 28 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a6, $sp, 32 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a5, $sp, 36 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a4, $sp, 40 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a3, $sp, 44 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a2, $sp, 48 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a1, $sp, 52 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $a0, $sp, 56 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $ra, $sp, 60 # 4-byte Folded Reload
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; LA32-NEXT: addi.w $sp, $sp, 64
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; LA32-NEXT: ret
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;
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; LA64-LABEL: preserve_mostcc1:
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; LA64: # %bb.0: # %entry
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; LA64-NEXT: addi.d $sp, $sp, -112
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; LA64-NEXT: st.d $ra, $sp, 104 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a0, $sp, 96 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a1, $sp, 88 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a2, $sp, 80 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a3, $sp, 72 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a4, $sp, 64 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a5, $sp, 56 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a6, $sp, 48 # 8-byte Folded Spill
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; LA64-NEXT: st.d $a7, $sp, 40 # 8-byte Folded Spill
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; LA64-NEXT: st.d $t4, $sp, 32 # 8-byte Folded Spill
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; LA64-NEXT: st.d $t5, $sp, 24 # 8-byte Folded Spill
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; LA64-NEXT: st.d $t6, $sp, 16 # 8-byte Folded Spill
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; LA64-NEXT: st.d $t7, $sp, 8 # 8-byte Folded Spill
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; LA64-NEXT: pcaddu18i $ra, %call36(standard_cc_func)
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; LA64-NEXT: jirl $ra, $ra, 0
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; LA64-NEXT: ld.d $t7, $sp, 8 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $t6, $sp, 16 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $t5, $sp, 24 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $t4, $sp, 32 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a7, $sp, 40 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a6, $sp, 48 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a5, $sp, 56 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a4, $sp, 64 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a3, $sp, 72 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a2, $sp, 80 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a1, $sp, 88 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $a0, $sp, 96 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $ra, $sp, 104 # 8-byte Folded Reload
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; LA64-NEXT: addi.d $sp, $sp, 112
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; LA64-NEXT: ret
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entry:
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call void @standard_cc_func()
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ret void
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}
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define preserve_mostcc void @preserve_mostcc2() nounwind {
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; LA32-LABEL: preserve_mostcc2:
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; LA32: # %bb.0:
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; LA32-NEXT: addi.w $sp, $sp, -16
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; LA32-NEXT: st.w $ra, $sp, 12 # 4-byte Folded Spill
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; LA32-NEXT: bl preserve_mostcc_func
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; LA32-NEXT: ld.w $ra, $sp, 12 # 4-byte Folded Reload
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; LA32-NEXT: addi.w $sp, $sp, 16
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; LA32-NEXT: ret
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;
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; LA64-LABEL: preserve_mostcc2:
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; LA64: # %bb.0:
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; LA64-NEXT: addi.d $sp, $sp, -16
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; LA64-NEXT: st.d $ra, $sp, 8 # 8-byte Folded Spill
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; LA64-NEXT: pcaddu18i $ra, %call36(preserve_mostcc_func)
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; LA64-NEXT: jirl $ra, $ra, 0
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; LA64-NEXT: ld.d $ra, $sp, 8 # 8-byte Folded Reload
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; LA64-NEXT: addi.d $sp, $sp, 16
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; LA64-NEXT: ret
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call preserve_mostcc void @preserve_mostcc_func()
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ret void
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}
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define void @preserve_mostcc3() nounwind {
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; LA32-LABEL: preserve_mostcc3:
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; LA32: # %bb.0:
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; LA32-NEXT: addi.w $sp, $sp, -16
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; LA32-NEXT: st.w $ra, $sp, 12 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s0, $sp, 8 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s1, $sp, 4 # 4-byte Folded Spill
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: move $a0, $t0
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: move $a1, $t1
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: move $a2, $t2
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: move $a3, $t3
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: move $a4, $t8
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: bl preserve_mostcc_func
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; LA32-NEXT: move $t0, $a0
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; LA32-NEXT: move $t1, $a1
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; LA32-NEXT: move $t2, $a2
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; LA32-NEXT: move $t3, $a3
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; LA32-NEXT: move $t8, $a4
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; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: ld.w $s1, $sp, 4 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $s0, $sp, 8 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $ra, $sp, 12 # 4-byte Folded Reload
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; LA32-NEXT: addi.w $sp, $sp, 16
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; LA32-NEXT: ret
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;
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; LA64-LABEL: preserve_mostcc3:
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; LA64: # %bb.0:
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; LA64-NEXT: addi.d $sp, $sp, -96
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; LA64-NEXT: st.d $ra, $sp, 88 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s0, $sp, 80 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s1, $sp, 72 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs0, $sp, 64 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs1, $sp, 56 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs2, $sp, 48 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs3, $sp, 40 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs4, $sp, 32 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs5, $sp, 24 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs6, $sp, 16 # 8-byte Folded Spill
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; LA64-NEXT: fst.d $fs7, $sp, 8 # 8-byte Folded Spill
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: move $a0, $t0
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: move $a1, $t1
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: move $a2, $t2
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: move $a3, $t3
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: move $a4, $t8
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: pcaddu18i $ra, %call36(preserve_mostcc_func)
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; LA64-NEXT: jirl $ra, $ra, 0
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; LA64-NEXT: move $t0, $a0
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; LA64-NEXT: move $t1, $a1
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; LA64-NEXT: move $t2, $a2
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; LA64-NEXT: move $t3, $a3
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; LA64-NEXT: move $t8, $a4
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; LA64-NEXT: #APP
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; LA64-NEXT: #NO_APP
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; LA64-NEXT: fld.d $fs7, $sp, 8 # 8-byte Folded Reload
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; LA64-NEXT: fld.d $fs6, $sp, 16 # 8-byte Folded Reload
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; LA64-NEXT: fld.d $fs5, $sp, 24 # 8-byte Folded Reload
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; LA64-NEXT: fld.d $fs4, $sp, 32 # 8-byte Folded Reload
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; LA64-NEXT: fld.d $fs3, $sp, 40 # 8-byte Folded Reload
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; LA64-NEXT: fld.d $fs2, $sp, 48 # 8-byte Folded Reload
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; LA64-NEXT: fld.d $fs1, $sp, 56 # 8-byte Folded Reload
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; LA64-NEXT: fld.d $fs0, $sp, 64 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $s1, $sp, 72 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $s0, $sp, 80 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $ra, $sp, 88 # 8-byte Folded Reload
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; LA64-NEXT: addi.d $sp, $sp, 96
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; LA64-NEXT: ret
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%1 = call i32 asm sideeffect "", "={r12}"() nounwind
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%2 = call i32 asm sideeffect "", "={r13}"() nounwind
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%3 = call i32 asm sideeffect "", "={r14}"() nounwind
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%4 = call i32 asm sideeffect "", "={r15}"() nounwind
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%5 = call i32 asm sideeffect "", "={r20}"() nounwind
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%6 = call i32 asm sideeffect "", "={r23}"() nounwind
206+
%7 = call i32 asm sideeffect "", "={r24}"() nounwind
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call preserve_mostcc void @preserve_mostcc_func()
208+
call void asm sideeffect "", "{r12},{r13},{r14},{r15},{r20},{r23},{r24}"(i32 %1, i32 %2, i32 %3, i32 %4, i32 %5, i32 %6, i32 %7)
209+
ret void
210+
}
211+
212+
define void @preserve_mostcc4() nounwind {
213+
; LA32-LABEL: preserve_mostcc4:
214+
; LA32: # %bb.0:
215+
; LA32-NEXT: addi.w $sp, $sp, -32
216+
; LA32-NEXT: st.w $ra, $sp, 28 # 4-byte Folded Spill
217+
; LA32-NEXT: st.w $fp, $sp, 24 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s0, $sp, 20 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s1, $sp, 16 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s2, $sp, 12 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s3, $sp, 8 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s4, $sp, 4 # 4-byte Folded Spill
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; LA32-NEXT: st.w $s5, $sp, 0 # 4-byte Folded Spill
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; LA32-NEXT: #APP
225+
; LA32-NEXT: #NO_APP
226+
; LA32-NEXT: move $fp, $t0
227+
; LA32-NEXT: #APP
228+
; LA32-NEXT: #NO_APP
229+
; LA32-NEXT: move $s2, $t1
230+
; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: move $s3, $t2
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; LA32-NEXT: #APP
234+
; LA32-NEXT: #NO_APP
235+
; LA32-NEXT: move $s4, $t3
236+
; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
238+
; LA32-NEXT: move $s5, $t8
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; LA32-NEXT: #APP
240+
; LA32-NEXT: #NO_APP
241+
; LA32-NEXT: #APP
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; LA32-NEXT: #NO_APP
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; LA32-NEXT: bl standard_cc_func
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; LA32-NEXT: move $t0, $fp
245+
; LA32-NEXT: move $t1, $s2
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; LA32-NEXT: move $t2, $s3
247+
; LA32-NEXT: move $t3, $s4
248+
; LA32-NEXT: move $t8, $s5
249+
; LA32-NEXT: #APP
250+
; LA32-NEXT: #NO_APP
251+
; LA32-NEXT: ld.w $s5, $sp, 0 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $s4, $sp, 4 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $s3, $sp, 8 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $s2, $sp, 12 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $s1, $sp, 16 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $s0, $sp, 20 # 4-byte Folded Reload
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; LA32-NEXT: ld.w $fp, $sp, 24 # 4-byte Folded Reload
258+
; LA32-NEXT: ld.w $ra, $sp, 28 # 4-byte Folded Reload
259+
; LA32-NEXT: addi.w $sp, $sp, 32
260+
; LA32-NEXT: ret
261+
;
262+
; LA64-LABEL: preserve_mostcc4:
263+
; LA64: # %bb.0:
264+
; LA64-NEXT: addi.d $sp, $sp, -80
265+
; LA64-NEXT: st.d $ra, $sp, 72 # 8-byte Folded Spill
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; LA64-NEXT: st.d $fp, $sp, 64 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s0, $sp, 56 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s1, $sp, 48 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s2, $sp, 40 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s3, $sp, 32 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s4, $sp, 24 # 8-byte Folded Spill
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; LA64-NEXT: st.d $s5, $sp, 16 # 8-byte Folded Spill
273+
; LA64-NEXT: #APP
274+
; LA64-NEXT: #NO_APP
275+
; LA64-NEXT: move $fp, $t0
276+
; LA64-NEXT: #APP
277+
; LA64-NEXT: #NO_APP
278+
; LA64-NEXT: move $s2, $t1
279+
; LA64-NEXT: #APP
280+
; LA64-NEXT: #NO_APP
281+
; LA64-NEXT: move $s3, $t2
282+
; LA64-NEXT: #APP
283+
; LA64-NEXT: #NO_APP
284+
; LA64-NEXT: move $s4, $t3
285+
; LA64-NEXT: #APP
286+
; LA64-NEXT: #NO_APP
287+
; LA64-NEXT: move $s5, $t8
288+
; LA64-NEXT: #APP
289+
; LA64-NEXT: #NO_APP
290+
; LA64-NEXT: #APP
291+
; LA64-NEXT: #NO_APP
292+
; LA64-NEXT: pcaddu18i $ra, %call36(standard_cc_func)
293+
; LA64-NEXT: jirl $ra, $ra, 0
294+
; LA64-NEXT: move $t0, $fp
295+
; LA64-NEXT: move $t1, $s2
296+
; LA64-NEXT: move $t2, $s3
297+
; LA64-NEXT: move $t3, $s4
298+
; LA64-NEXT: move $t8, $s5
299+
; LA64-NEXT: #APP
300+
; LA64-NEXT: #NO_APP
301+
; LA64-NEXT: ld.d $s5, $sp, 16 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $s4, $sp, 24 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $s3, $sp, 32 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $s2, $sp, 40 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $s1, $sp, 48 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $s0, $sp, 56 # 8-byte Folded Reload
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; LA64-NEXT: ld.d $fp, $sp, 64 # 8-byte Folded Reload
308+
; LA64-NEXT: ld.d $ra, $sp, 72 # 8-byte Folded Reload
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; LA64-NEXT: addi.d $sp, $sp, 80
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; LA64-NEXT: ret
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%1 = call i32 asm sideeffect "", "={r12}"() nounwind
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%2 = call i32 asm sideeffect "", "={r13}"() nounwind
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%3 = call i32 asm sideeffect "", "={r14}"() nounwind
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%4 = call i32 asm sideeffect "", "={r15}"() nounwind
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%5 = call i32 asm sideeffect "", "={r20}"() nounwind
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%6 = call i32 asm sideeffect "", "={r23}"() nounwind
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%7 = call i32 asm sideeffect "", "={r24}"() nounwind
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call void @standard_cc_func()
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call void asm sideeffect "", "{r12},{r13},{r14},{r15},{r20},{r23},{r24}"(i32 %1, i32 %2, i32 %3, i32 %4, i32 %5, i32 %6, i32 %7)
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ret void
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}

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