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[RISCV] Codegen support for RV32D floating point conversion operations 

This also includes support and a test for truncating stores, which are now
possible thanks to the fpround pattern.

llvm-svn: 329876
This commit is contained in:
Alex Bradbury 2018-04-12 05:47:15 +00:00
parent 0b0b882356
commit 60baa2e015
4 changed files with 121 additions and 0 deletions
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1
llvm/lib/Target/RISCV/RISCVISelLowering.cpp
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@ -125,6 +125,7 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
setOperationAction(ISD::FMINNUM, MVT::f64, Legal);
setOperationAction(ISD::FMAXNUM, MVT::f64, Legal);
setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f32, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
}
setOperationAction(ISD::GlobalAddress, XLenVT, Custom);

14
llvm/lib/Target/RISCV/RISCVInstrInfoD.td
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@ -199,6 +199,20 @@ class PatFpr64Fpr64DynFrm<SDPatternOperator OpNode, RVInstRFrm Inst>
let Predicates = [HasStdExtD] in {
/// Float conversion operations
// f64 -> f32, f32 -> f64
def : Pat<(fpround FPR64:$rs1), (FCVT_S_D FPR64:$rs1, 0b111)>;
def : Pat<(fpextend FPR32:$rs1), (FCVT_D_S FPR32:$rs1)>;
// FP->[u]int. Round-to-zero must be used
def : Pat<(fp_to_sint FPR64:$rs1), (FCVT_W_D FPR64:$rs1, 0b001)>;
def : Pat<(fp_to_uint FPR64:$rs1), (FCVT_WU_D FPR64:$rs1, 0b001)>;
// [u]int->fp
def : Pat<(sint_to_fp GPR:$rs1), (FCVT_D_W GPR:$rs1)>;
def : Pat<(uint_to_fp GPR:$rs1), (FCVT_D_WU GPR:$rs1)>;
/// Float arithmetic operations
def : PatFpr64Fpr64DynFrm<fadd, FADD_D>;

89
llvm/test/CodeGen/RISCV/double-convert.ll Normal file
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@ -0,0 +1,89 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs < %s \
; RUN: | FileCheck -check-prefix=RV32IFD %s
define float @fcvt_s_d(double %a) nounwind {
; RV32IFD-LABEL: fcvt_s_d:
; RV32IFD: # %bb.0:
; RV32IFD-NEXT: addi sp, sp, -16
; RV32IFD-NEXT: sw a0, 8(sp)
; RV32IFD-NEXT: sw a1, 12(sp)
; RV32IFD-NEXT: fld ft0, 8(sp)
; RV32IFD-NEXT: fcvt.s.d ft0, ft0
; RV32IFD-NEXT: fmv.x.w a0, ft0
; RV32IFD-NEXT: addi sp, sp, 16
; RV32IFD-NEXT: ret
%1 = fptrunc double %a to float
ret float %1
}
define double @fcvt_d_s(float %a) nounwind {
; RV32IFD-LABEL: fcvt_d_s:
; RV32IFD: # %bb.0:
; RV32IFD-NEXT: addi sp, sp, -16
; RV32IFD-NEXT: fmv.w.x ft0, a0
; RV32IFD-NEXT: fcvt.d.s ft0, ft0
; RV32IFD-NEXT: fsd ft0, 8(sp)
; RV32IFD-NEXT: lw a0, 8(sp)
; RV32IFD-NEXT: lw a1, 12(sp)
; RV32IFD-NEXT: addi sp, sp, 16
; RV32IFD-NEXT: ret
%1 = fpext float %a to double
ret double %1
}
define i32 @fcvt_w_d(double %a) nounwind {
; RV32IFD-LABEL: fcvt_w_d:
; RV32IFD: # %bb.0:
; RV32IFD-NEXT: addi sp, sp, -16
; RV32IFD-NEXT: sw a0, 8(sp)
; RV32IFD-NEXT: sw a1, 12(sp)
; RV32IFD-NEXT: fld ft0, 8(sp)
; RV32IFD-NEXT: fcvt.w.d a0, ft0, rtz
; RV32IFD-NEXT: addi sp, sp, 16
; RV32IFD-NEXT: ret
%1 = fptosi double %a to i32
ret i32 %1
}
define i32 @fcvt_wu_d(double %a) nounwind {
; RV32IFD-LABEL: fcvt_wu_d:
; RV32IFD: # %bb.0:
; RV32IFD-NEXT: addi sp, sp, -16
; RV32IFD-NEXT: sw a0, 8(sp)
; RV32IFD-NEXT: sw a1, 12(sp)
; RV32IFD-NEXT: fld ft0, 8(sp)
; RV32IFD-NEXT: fcvt.wu.d a0, ft0, rtz
; RV32IFD-NEXT: addi sp, sp, 16
; RV32IFD-NEXT: ret
%1 = fptoui double %a to i32
ret i32 %1
}
define double @fcvt_d_w(i32 %a) nounwind {
; RV32IFD-LABEL: fcvt_d_w:
; RV32IFD: # %bb.0:
; RV32IFD-NEXT: addi sp, sp, -16
; RV32IFD-NEXT: fcvt.d.w ft0, a0
; RV32IFD-NEXT: fsd ft0, 8(sp)
; RV32IFD-NEXT: lw a0, 8(sp)
; RV32IFD-NEXT: lw a1, 12(sp)
; RV32IFD-NEXT: addi sp, sp, 16
; RV32IFD-NEXT: ret
%1 = sitofp i32 %a to double
ret double %1
}
define double @fcvt_d_wu(i32 %a) nounwind {
; RV32IFD-LABEL: fcvt_d_wu:
; RV32IFD: # %bb.0:
; RV32IFD-NEXT: addi sp, sp, -16
; RV32IFD-NEXT: fcvt.d.wu ft0, a0
; RV32IFD-NEXT: fsd ft0, 8(sp)
; RV32IFD-NEXT: lw a0, 8(sp)
; RV32IFD-NEXT: lw a1, 12(sp)
; RV32IFD-NEXT: addi sp, sp, 16
; RV32IFD-NEXT: ret
%1 = uitofp i32 %a to double
ret double %1
}

17
llvm/test/CodeGen/RISCV/double-mem.ll
View File

@ -170,3 +170,20 @@ define void @fsd_stack(double %a, double %b) nounwind {
call void @notdead(i8* %3)
ret void
}
; Test selection of store<ST4[%a], trunc to f32>, ..
define void @fsd_trunc(float* %a, double %b) nounwind noinline optnone {
; RV32IFD-LABEL: fsd_trunc:
; RV32IFD: # %bb.0:
; RV32IFD-NEXT: addi sp, sp, -16
; RV32IFD-NEXT: sw a1, 8(sp)
; RV32IFD-NEXT: sw a2, 12(sp)
; RV32IFD-NEXT: fld ft0, 8(sp)
; RV32IFD-NEXT: fcvt.s.d ft0, ft0
; RV32IFD-NEXT: fsw ft0, 0(a0)
; RV32IFD-NEXT: addi sp, sp, 16
; RV32IFD-NEXT: ret
%1 = fptrunc double %b to float
store float %1, float* %a, align 4
ret void
}