47b1f8362a
Prior to this patch, libcalls inserted by the SelectionDAG legalizer could never be tailcalled. The eligibility of libcalls for tail calling is is partly determined by checking TargetLowering::isInTailCallPosition and comparing the return type of the libcall and the calleer. isInTailCallPosition in turn calls TargetLowering::isUsedByReturnOnly (which always returns false if not implemented by the target). This patch provides a minimal implementation of TargetLowering::isUsedByReturnOnly - enough to support tail calling libcalls on hard float ABIs. Soft-float ABIs are left for a follow on patch. libcall-tail-calls.ll also shows missed opportunities to tail call integer libcalls, but this is due to issues outside of the isUsedByReturnOnly hook. Differential Revision: https://reviews.llvm.org/D131087
18 lines
580 B
LLVM
18 lines
580 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
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; RUN: | FileCheck -check-prefix=RV32IFD %s
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; RUN: llc -mtriple=riscv64 -mattr=+d -verify-machineinstrs < %s \
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; RUN: | FileCheck -check-prefix=RV64IFD %s
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define double @frem_f64(double %a, double %b) nounwind {
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; RV32IFD-LABEL: frem_f64:
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; RV32IFD: # %bb.0:
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; RV32IFD-NEXT: tail fmod@plt
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;
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; RV64IFD-LABEL: frem_f64:
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; RV64IFD: # %bb.0:
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; RV64IFD-NEXT: tail fmod@plt
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%1 = frem double %a, %b
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ret double %1
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}
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