boot2

Playing with the boostrap
git clone https://git.ryansepassi.com/git/boot2.git
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riscv64-cvt-int-narrow.after (690B)

      1 #if defined(TCC_TARGET_RISCV64)
      2             } else if ((dbt & VT_BTYPE) == VT_INT &&
      3                        ((sbt & VT_BTYPE) == VT_LLONG ||
      4                         (sbt & VT_BTYPE) == VT_PTR ||
      5                         (sbt & VT_BTYPE) == VT_FUNC)) {
      6                 /* RV64 keeps every 32-bit register value sign-extended,
      7                    including unsigned int.  A cast from a 64-bit register
      8                    must actually discard bits 63:32; relabelling alone lets
      9                    those bits affect a following 64-bit SLT/SLTU. */
     10                 gv(RC_INT);
     11                 vtop->type.t = VT_INT;
     12                 gen_cvt_sxtw();
     13 #endif
     14             } else if (dbt == VT_BOOL) {