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tcg/arm: Expand epilogue inline 

It is, after all, just two instructions.

Profiling on a cortex-a15, using -d nochain to increase the number
of exit_tb that are executed, shows a minor improvement of 0.5%.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2020-02-16 01:36:56 -08:00 committed by Richard Henderson
parent d6fa50f536
commit fc1bfdfd0c
1 changed files with 2 additions and 10 deletions
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12
tcg/arm/tcg-target.inc.c
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@ -1745,7 +1745,6 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
#endif
}
static tcg_insn_unit *tb_ret_addr;
static void tcg_out_epilogue(TCGContext *s);
static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
@ -1756,14 +1755,8 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
switch (opc) {
case INDEX_op_exit_tb:
/* Reuse the zeroing that exists for goto_ptr. */
a0 = args[0];
if (a0 == 0) {
tcg_out_goto(s, COND_AL, s->code_gen_epilogue);
} else {
tcg_out_movi32(s, COND_AL, TCG_REG_R0, args[0]);
tcg_out_goto(s, COND_AL, tb_ret_addr);
}
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R0, args[0]);
tcg_out_epilogue(s);
break;
case INDEX_op_goto_tb:
{
@ -2309,7 +2302,6 @@ static void tcg_target_qemu_prologue(TCGContext *s)
*/
s->code_gen_epilogue = s->code_ptr;
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R0, 0);
tb_ret_addr = s->code_ptr;
tcg_out_epilogue(s);
}