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| author | Richard Henderson <rth@twiddle.net> | 2016-06-19 22:59:13 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2016-07-05 20:50:13 -0700 |
| commit | 59d7c14eeff8d2ad7f61aed86ce5a176113bc153 (patch) | |
| tree | a35fd8794ff364683cd31b650affc4f3d9289ce1 /tcg/aarch64 | |
| parent | 120c1084ed53ba2967ba2a6e751cdfb00a17c246 (diff) | |
| download | qemu-59d7c14eeff8d2ad7f61aed86ce5a176113bc153.zip qemu-59d7c14eeff8d2ad7f61aed86ce5a176113bc153.tar.gz qemu-59d7c14eeff8d2ad7f61aed86ce5a176113bc153.tar.bz2 | |
tcg: Optimize spills of constants
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>
Diffstat (limited to 'tcg/aarch64')
| -rw-r--r-- | tcg/aarch64/tcg-target.inc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c index 1447f7c..5ac0091 100644 --- a/tcg/aarch64/tcg-target.inc.c +++ b/tcg/aarch64/tcg-target.inc.c @@ -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) { |