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tcg/sparc: Introduce tcg_out_mov_delay 

This version of tcg_out_mov is emits a nop to fill the
delay slot if the move is not required.

The only current use, for INDEX_op_goto_ptr, will always
require the move but properly documents the delay slot.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-08-05 01:15:53 +03:00
parent 897fd616fd
commit 220b2da7f3
1 changed files with 15 additions and 6 deletions
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21
tcg/sparc/tcg-target.c.inc
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@ -362,6 +362,11 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
} }
} }
static void tcg_out_nop(TCGContext *s)
{
tcg_out32(s, NOP);
}
static void tcg_out_arith(TCGContext *s, TCGReg rd, TCGReg rs1, static void tcg_out_arith(TCGContext *s, TCGReg rd, TCGReg rs1,
TCGReg rs2, int op) TCGReg rs2, int op)
{ {
@ -389,6 +394,15 @@ static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg)
return true; return true;
} }
static void tcg_out_mov_delay(TCGContext *s, TCGReg ret, TCGReg arg)
{
if (ret != arg) {
tcg_out_arith(s, ret, arg, TCG_REG_G0, ARITH_OR);
} else {
tcg_out_nop(s);
}
}
static void tcg_out_sethi(TCGContext *s, TCGReg ret, uint32_t arg) static void tcg_out_sethi(TCGContext *s, TCGReg ret, uint32_t arg)
{ {
tcg_out32(s, SETHI | INSN_RD(ret) | ((arg & 0xfffffc00) >> 10)); tcg_out32(s, SETHI | INSN_RD(ret) | ((arg & 0xfffffc00) >> 10));
@ -551,11 +565,6 @@ static void tcg_out_div32(TCGContext *s, TCGReg rd, TCGReg rs1,
uns ? ARITH_UDIV : ARITH_SDIV); uns ? ARITH_UDIV : ARITH_SDIV);
} }
static void tcg_out_nop(TCGContext *s)
{
tcg_out32(s, NOP);
}
static const uint8_t tcg_cond_to_bcond[] = { static const uint8_t tcg_cond_to_bcond[] = {
[TCG_COND_EQ] = COND_E, [TCG_COND_EQ] = COND_E,
[TCG_COND_NE] = COND_NE, [TCG_COND_NE] = COND_NE,
@ -1349,7 +1358,7 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
case INDEX_op_goto_ptr: case INDEX_op_goto_ptr:
tcg_out_arithi(s, TCG_REG_G0, a0, 0, JMPL); tcg_out_arithi(s, TCG_REG_G0, a0, 0, JMPL);
if (USE_REG_TB) { if (USE_REG_TB) {
tcg_out_arith(s, TCG_REG_TB, a0, TCG_REG_G0, ARITH_OR); tcg_out_mov_delay(s, TCG_REG_TB, a0);
} else { } else {
tcg_out_nop(s); tcg_out_nop(s);
} }