SYS-OSS/FRET-qemu
4
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

tcg/i386: Handle all 8-bit extensions for i686

Browse Source 
When we generalize {s}extract_i32, we'll lose the
specific register constraints on ext8u and ext8s.
It's just as easy to emit a couple of insns instead.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-26 13:06:45 -08:00
parent 72912ac736
commit ad76017e51
1 changed files with 19 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
tcg/i386/tcg-target.c.inc
View File

@ -1329,16 +1329,31 @@ static inline void tcg_out_rolw_8(TCGContext *s, int reg)
static void tcg_out_ext8u(TCGContext *s, TCGReg dest, TCGReg src)
{
/* movzbl */
tcg_debug_assert(src < 4 || TCG_TARGET_REG_BITS == 64);
if (TCG_TARGET_REG_BITS == 32 && src >= 4) {
tcg_out_mov(s, TCG_TYPE_I32, dest, src);
if (dest >= 4) {
tcg_out_modrm(s, OPC_ARITH_EvIz, ARITH_AND, dest);
tcg_out32(s, 0xff);
return;
}
src = dest;
}
tcg_out_modrm(s, OPC_MOVZBL + P_REXB_RM, dest, src);
}
static void tcg_out_ext8s(TCGContext *s, TCGType type, TCGReg dest, TCGReg src)
{
int rexw = type == TCG_TYPE_I32 ? 0 : P_REXW;
/* movsbl */
tcg_debug_assert(src < 4 || TCG_TARGET_REG_BITS == 64);
if (TCG_TARGET_REG_BITS == 32 && src >= 4) {
tcg_out_mov(s, TCG_TYPE_I32, dest, src);
if (dest >= 4) {
tcg_out_shifti(s, SHIFT_SHL, dest, 24);
tcg_out_shifti(s, SHIFT_SAR, dest, 24);
return;
}
src = dest;
}
tcg_out_modrm(s, OPC_MOVSBL + P_REXB_RM + rexw, dest, src);
}