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tcg: Optimize spills of constants

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While we can store constants via constrants on INDEX_op_st_i32 et al,
we weren't able to spill constants to backing store.

Add a new backend interface, tcg_out_sti, which may store the constant
(and is allowed to fail).  Rearrange the temp_* helpers so that we only
attempt to directly store a constant when the temp is becoming dead/free.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-06-19 22:59:13 -07:00
parent 120c1084ed
commit 59d7c14eef
10 changed files with 169 additions and 81 deletions
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10
tcg/aarch64/tcg-target.inc.c
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@ -716,6 +716,16 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
arg, arg1, arg2);
}
static inline bool tcg_out_sti(TCGContext *s, TCGType type, TCGArg val,
TCGReg base, intptr_t ofs)
{
if (val == 0) {
tcg_out_st(s, type, TCG_REG_XZR, base, ofs);
return true;
}
return false;
}
static inline void tcg_out_bfm(TCGContext *s, TCGType ext, TCGReg rd,
TCGReg rn, unsigned int a, unsigned int b)
{