haraldwolff/qemu-patch-raspberry4
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tcg/tci: Support bswap flags

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The existing interpreter zero-extends, ignoring high bits.
Simply add a separate sign-extension opcode if required.
Ensure that the interpreter supports ext16s when bswap16 is enabled.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-13 12:34:30 -07:00
parent 1fce653440
commit 0d57d36af5
2 changed files with 22 additions and 4 deletions
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3
tcg/tci.c
View file

@ -808,7 +808,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
regs[r0] = (int8_t)regs[r1];
break;
#endif
#if TCG_TARGET_HAS_ext16s_i32 || TCG_TARGET_HAS_ext16s_i64
#if TCG_TARGET_HAS_ext16s_i32 || TCG_TARGET_HAS_ext16s_i64 || \
TCG_TARGET_HAS_bswap16_i32 || TCG_TARGET_HAS_bswap16_i64
CASE_32_64(ext16s)
tci_args_rr(insn, &r0, &r1);
regs[r0] = (int16_t)regs[r1];

23
tcg/tci/tcg-target.c.inc
View file

@ -597,6 +597,8 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
const TCGArg args[TCG_MAX_OP_ARGS],
const int const_args[TCG_MAX_OP_ARGS])
{
TCGOpcode exts;
switch (opc) {
case INDEX_op_exit_tb:
tcg_out_op_p(s, opc, (void *)args[0]);
@ -710,13 +712,28 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
CASE_64(ext32u) /* Optional (TCG_TARGET_HAS_ext32u_i64). */
CASE_64(ext_i32)
CASE_64(extu_i32)
CASE_32_64(bswap16) /* Optional (TCG_TARGET_HAS_bswap16_*). */
CASE_32_64(bswap32) /* Optional (TCG_TARGET_HAS_bswap32_*). */
CASE_64(bswap64) /* Optional (TCG_TARGET_HAS_bswap64_i64). */
CASE_32_64(ctpop) /* Optional (TCG_TARGET_HAS_ctpop_*). */
case INDEX_op_bswap32_i32: /* Optional (TCG_TARGET_HAS_bswap32_i32). */
case INDEX_op_bswap64_i64: /* Optional (TCG_TARGET_HAS_bswap64_i64). */
tcg_out_op_rr(s, opc, args[0], args[1]);
break;
case INDEX_op_bswap16_i32: /* Optional (TCG_TARGET_HAS_bswap16_i32). */
exts = INDEX_op_ext16s_i32;
goto do_bswap;
case INDEX_op_bswap16_i64: /* Optional (TCG_TARGET_HAS_bswap16_i64). */
exts = INDEX_op_ext16s_i64;
goto do_bswap;
case INDEX_op_bswap32_i64: /* Optional (TCG_TARGET_HAS_bswap32_i64). */
exts = INDEX_op_ext32s_i64;
do_bswap:
/* The base tci bswaps zero-extend, and ignore high bits. */
tcg_out_op_rr(s, opc, args[0], args[1]);
if (args[2] & TCG_BSWAP_OS) {
tcg_out_op_rr(s, exts, args[0], args[0]);
}
break;
CASE_32_64(add2)
CASE_32_64(sub2)
tcg_out_op_rrrrrr(s, opc, args[0], args[1], args[2],