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| author | Aurelien Jarno <aurelien@aurel32.net> | 2015-07-27 12:41:45 +0200 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2015-08-24 11:10:54 -0700 |
| commit | 8bcb5c8f34f9215d4f88f388c7ff14c9bd5cecd3 (patch) | |
| tree | 8f0dcb356b6144ce20c61899c1267fc9c6db6ebb /tcg | |
| parent | 4f2331e5b67af8172419eb1c8db510b497b30a7b (diff) | |
| download | qemu-8bcb5c8f34f9215d4f88f388c7ff14c9bd5cecd3.zip | |
tcg/optimize: add optimizations for ext_i32_i64 and extu_i32_i64 ops
They behave the same as ext32s_i64 and ext32u_i64 from the constant
folding and zero propagation point of view, except that they can't
be replaced by a mov, so we don't compute the affected value.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/optimize.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c index 47f41472f1..18046051d3 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -343,9 +343,11 @@ static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y) CASE_OP_32_64(ext16u): return (uint16_t)x; + case INDEX_op_ext_i32_i64: case INDEX_op_ext32s_i64: return (int32_t)x; + case INDEX_op_extu_i32_i64: case INDEX_op_ext32u_i64: return (uint32_t)x; @@ -837,6 +839,15 @@ void tcg_optimize(TCGContext *s) mask = temps[args[1]].mask & mask; break; + case INDEX_op_ext_i32_i64: + if ((temps[args[1]].mask & 0x80000000) != 0) { + break; + } + case INDEX_op_extu_i32_i64: + /* We do not compute affected as it is a size changing op. */ + mask = (uint32_t)temps[args[1]].mask; + break; + CASE_OP_32_64(andc): /* Known-zeros does not imply known-ones. Therefore unless args[2] is constant, we can't infer anything from it. */ @@ -1015,6 +1026,8 @@ void tcg_optimize(TCGContext *s) CASE_OP_32_64(ext16u): case INDEX_op_ext32s_i64: case INDEX_op_ext32u_i64: + case INDEX_op_ext_i32_i64: + case INDEX_op_extu_i32_i64: if (temp_is_const(args[1])) { tmp = do_constant_folding(opc, temps[args[1]].val, 0); tcg_opt_gen_movi(s, op, args, args[0], tmp); |