According to spec, fmv.h checks if the input operands are correctly NaN-boxed. If not, the input value is treated as an n-bit canonical NaN. This patch fixs the issue that operands returned by soft-fp16 libgcc (i.e., __truncdfhf2) was not correctly NaN-boxed.
*gcc/ChangeLog:* * config/riscv/riscv.cc (riscv_legitimize_move): Expand movfh with Nan-boxing value. * config/riscv/riscv.md (*movhf_softfloat_unspec): New pattern. *gcc/testsuite/ChangeLog:* gcc.target/riscv/_Float16-nanboxing.c: New test.
0001-RISC-V-Nan-box-the-result-of-movhf-on-soft-fp16.patch
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