Ah, true. On 9 April 2016 at 09:57, Richard Henderson <r...@twiddle.net> wrote:
> On 04/08/2016 05:29 PM, Thomas Hanson wrote: > >> Looking at tcg_out_tlb_load(): >> If I'm reading the pseudo-assembler of the function names correctly, it >> looks >> like in the i386 code we're already masking the address being checked: >> tgen_arithi(s, ARITH_AND + trexw, r1, TARGET_PAGE_MASK | (aligned ? >> s_mask >> : 0), 0); >> where TARGET_PAGE_MASK is a simple all-1's mask in the appropriate upper >> bits. >> >> Can we just poke some 0's into that mask in the tag locations? >> > > No, because we'd no longer have a sign-extended 32-bit value, as fits in > that immediate operand field. To load the constant you're asking for, we'd > need a 64-bit move insn and another register. > > > r~ >
