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tcg/sparc: Use tcg_out_movi_imm13 in tcg_out_addsub2_i64 

When BH is constant, it is constrained to 11 bits for use in MOVCC.
For the cases in which we must load the constant BH into a register,
we do not need the full logic of tcg_out_movi; we can use the simpler
function for emitting a 13 bit constant.

This eliminates the only case in which TCG_REG_T2 was passed to
tcg_out_movi, which will shortly become invalid.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2022-02-08 10:15:58 +11:00
parent d9e5283465
commit 414399b6b8
1 changed files with 7 additions and 3 deletions
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10
tcg/sparc/tcg-target.c.inc
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@ -795,7 +795,7 @@ static void tcg_out_addsub2_i64(TCGContext *s, TCGReg rl, TCGReg rh,
if (use_vis3_instructions && !is_sub) {
/* Note that ADDXC doesn't accept immediates. */
if (bhconst && bh != 0) {
tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_T2, bh);
tcg_out_movi_imm13(s, TCG_REG_T2, bh);
bh = TCG_REG_T2;
}
tcg_out_arith(s, rh, ah, bh, ARITH_ADDXC);
@ -811,9 +811,13 @@ static void tcg_out_addsub2_i64(TCGContext *s, TCGReg rl, TCGReg rh,
tcg_out_movcc(s, TCG_COND_GEU, MOVCC_XCC, rh, ah, 0);
}
} else {
/* Otherwise adjust BH as if there is carry into T2 ... */
/*
* Otherwise adjust BH as if there is carry into T2.
* Note that constant BH is constrained to 11 bits for the MOVCC,
* so the adjustment fits 12 bits.
*/
if (bhconst) {
tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_T2, bh + (is_sub ? -1 : 1));
tcg_out_movi_imm13(s, TCG_REG_T2, bh + (is_sub ? -1 : 1));
} else {
tcg_out_arithi(s, TCG_REG_T2, bh, 1,
is_sub ? ARITH_SUB : ARITH_ADD);