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tcg/mips: Split out tcg_out_movi_two 

Emit all 32-bit signed constants, which can be loaded in two insns.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-08-06 12:14:53 -10:00
parent 47a572865a
commit 1d9c5b3084
1 changed files with 24 additions and 11 deletions
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35
tcg/mips/tcg-target.c.inc
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@ -527,6 +527,22 @@ static bool tcg_out_movi_one(TCGContext *s, TCGReg ret, tcg_target_long arg)
return false; return false;
} }
static bool tcg_out_movi_two(TCGContext *s, TCGReg ret, tcg_target_long arg)
{
/*
* All signed 32-bit constants are loadable with two immediates,
* and everything else requires more work.
*/
if (arg == (int32_t)arg) {
if (!tcg_out_movi_one(s, ret, arg)) {
tcg_out_opc_imm(s, OPC_LUI, ret, TCG_REG_ZERO, arg >> 16);
tcg_out_opc_imm(s, OPC_ORI, ret, ret, arg & 0xffff);
}
return true;
}
return false;
}
static void tcg_out_movi(TCGContext *s, TCGType type, static void tcg_out_movi(TCGContext *s, TCGType type,
TCGReg ret, tcg_target_long arg) TCGReg ret, tcg_target_long arg)
{ {
@ -534,21 +550,18 @@ static void tcg_out_movi(TCGContext *s, TCGType type,
arg = (int32_t)arg; arg = (int32_t)arg;
} }
if (tcg_out_movi_one(s, ret, arg)) { /* Load all 32-bit constants. */
if (tcg_out_movi_two(s, ret, arg)) {
return; return;
} }
if (TCG_TARGET_REG_BITS == 32 || arg == (int32_t)arg) { tcg_out_movi(s, TCG_TYPE_I32, ret, arg >> 31 >> 1);
tcg_out_opc_imm(s, OPC_LUI, ret, TCG_REG_ZERO, arg >> 16); if (arg & 0xffff0000ull) {
tcg_out_dsll(s, ret, ret, 16);
tcg_out_opc_imm(s, OPC_ORI, ret, ret, arg >> 16);
tcg_out_dsll(s, ret, ret, 16);
} else { } else {
tcg_out_movi(s, TCG_TYPE_I32, ret, arg >> 31 >> 1); tcg_out_dsll(s, ret, ret, 32);
if (arg & 0xffff0000ull) {
tcg_out_dsll(s, ret, ret, 16);
tcg_out_opc_imm(s, OPC_ORI, ret, ret, arg >> 16);
tcg_out_dsll(s, ret, ret, 16);
} else {
tcg_out_dsll(s, ret, ret, 32);
}
} }
if (arg & 0xffff) { if (arg & 0xffff) {
tcg_out_opc_imm(s, OPC_ORI, ret, ret, arg & 0xffff); tcg_out_opc_imm(s, OPC_ORI, ret, ret, arg & 0xffff);