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[LoongArch] Assume no-op addrspacecasts by default #82332

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Feb 21, 2024
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[LoongArch] Assume no-op addrspacecasts by default #82332

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[LoongArch] Assume no-op addrspacecasts by default
heiher Feb 20, 2024
46c7cbe
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heiher Feb 21, 2024
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5 changes: 5 additions & 0 deletions llvm/lib/Target/LoongArch/LoongArchTargetMachine.h
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Expand Up @@ -45,6 +45,11 @@ class LoongArchTargetMachine : public LLVMTargetMachine {
MachineFunctionInfo *
createMachineFunctionInfo(BumpPtrAllocator &Allocator, const Function &F,
const TargetSubtargetInfo *STI) const override;

// Addrspacecasts are always noops.
bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
return true;
}
};

} // end namespace llvm
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47 changes: 47 additions & 0 deletions llvm/test/CodeGen/LoongArch/addrspacecast.ll
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@@ -0,0 +1,47 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=loongarch32 -verify-machineinstrs < %s | FileCheck %s --check-prefix=LA32
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; RUN: llc -mtriple=loongarch64 -verify-machineinstrs < %s | FileCheck %s --check-prefix=LA64

define void @cast0(ptr addrspace(1) %ptr) {
; LA32-LABEL: cast0:
; LA32: # %bb.0:
; LA32-NEXT: st.w $zero, $a0, 0
; LA32-NEXT: ret
;
; LA64-LABEL: cast0:
; LA64: # %bb.0:
; LA64-NEXT: st.w $zero, $a0, 0
; LA64-NEXT: ret
%ptr0 = addrspacecast ptr addrspace(1) %ptr to ptr addrspace(0)
store i32 0, ptr %ptr0
ret void
}

define void @cast1(ptr %ptr) {
; LA32-LABEL: cast1:
; LA32: # %bb.0:
; LA32-NEXT: addi.w $sp, $sp, -16
; LA32-NEXT: .cfi_def_cfa_offset 16
; LA32-NEXT: st.w $ra, $sp, 12 # 4-byte Folded Spill
; LA32-NEXT: .cfi_offset 1, -4
; LA32-NEXT: bl %plt(foo)
; LA32-NEXT: ld.w $ra, $sp, 12 # 4-byte Folded Reload
; LA32-NEXT: addi.w $sp, $sp, 16
; LA32-NEXT: ret
;
; LA64-LABEL: cast1:
; LA64: # %bb.0:
; LA64-NEXT: addi.d $sp, $sp, -16
; LA64-NEXT: .cfi_def_cfa_offset 16
; LA64-NEXT: st.d $ra, $sp, 8 # 8-byte Folded Spill
; LA64-NEXT: .cfi_offset 1, -8
; LA64-NEXT: bl %plt(foo)
; LA64-NEXT: ld.d $ra, $sp, 8 # 8-byte Folded Reload
; LA64-NEXT: addi.d $sp, $sp, 16
; LA64-NEXT: ret
%castptr = addrspacecast ptr %ptr to ptr addrspace(10)
call void @foo(ptr addrspace(10) %castptr)
ret void
}

declare void @foo(ptr addrspace(10))
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