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tcg: Improve call argument loading

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Free the argument register only after we have verified that the
temporary is not already in that register. This case is likely
now that we are back propagating the preferred register.

Backports commit 4250da10923347c9ee907f8d72bd93dfa5ee8742 from qemu
This commit is contained in:
Richard Henderson 2019-01-05 07:24:04 -05:00 committed by Lioncash
parent 64843e8c09
commit 6ed82f77b4
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 1 deletions
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3
qemu/tcg/tcg.c
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@ -3141,15 +3141,16 @@ static void tcg_reg_alloc_call(TCGContext *s, TCGOp *op)
if (arg != TCG_CALL_DUMMY_ARG) {
ts = arg_temp(arg);
reg = tcg_target_call_iarg_regs[i];
tcg_reg_free(s, reg, allocated_regs);
if (ts->val_type == TEMP_VAL_REG) {
if (ts->reg != reg) {
tcg_reg_free(s, reg, allocated_regs);
tcg_out_mov(s, ts->type, reg, ts->reg);
}
} else {
TCGRegSet arg_set = 0;
tcg_reg_free(s, reg, allocated_regs);
tcg_regset_set_reg(arg_set, reg);
temp_load(s, ts, arg_set, allocated_regs, 0);
}