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authorRichard Henderson <rth@twiddle.net>2013-09-05 16:44:18 -0400
committerRichard Henderson <rth@twiddle.net>2013-11-18 15:57:33 +1000
commitf940fb086c607fcb9c98d5ce67619fc5255f6abb (patch)
tree9395eb0576fa5a6764ae7274c10286625d5345a8
parent8642088a3d73a599b31c6fdd1d2aa2c945d95ced (diff)
tcg-ia64: Use SUB_A3 and ADDS_A4 for subtraction
We can subtract from more small constants that just 0 with one insn, and we can add the negative for most small constants. Acked-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
-rw-r--r--tcg/ia64/tcg-target.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/tcg/ia64/tcg-target.c b/tcg/ia64/tcg-target.c
index 8fb3ba04df..54232eb495 100644
--- a/tcg/ia64/tcg-target.c
+++ b/tcg/ia64/tcg-target.c
@@ -1080,6 +1080,28 @@ static inline void tcg_out_add(TCGContext *s, TCGReg ret, TCGReg arg1,
}
}
+static inline void tcg_out_sub(TCGContext *s, TCGReg ret, TCGArg arg1,
+ int const_arg1, TCGArg arg2, int const_arg2)
+{
+ if (const_arg1 && arg1 == (int8_t)arg1) {
+ if (const_arg2) {
+ tcg_out_movi(s, TCG_TYPE_I64, ret, arg1 - arg2);
+ return;
+ }
+ tcg_out_bundle(s, mmI,
+ INSN_NOP_M,
+ INSN_NOP_M,
+ tcg_opc_a3(TCG_REG_P0, OPC_SUB_A3, ret, arg1, arg2));
+ } else if (const_arg2 && -arg2 == sextract64(-arg2, 0, 14)) {
+ tcg_out_bundle(s, mmI,
+ INSN_NOP_M,
+ INSN_NOP_M,
+ tcg_opc_a4(TCG_REG_P0, OPC_ADDS_A4, ret, -arg2, arg1));
+ } else {
+ tcg_out_alu(s, OPC_SUB_A1, ret, arg1, const_arg1, arg2, const_arg2);
+ }
+}
+
static inline void tcg_out_eqv(TCGContext *s, TCGArg ret,
TCGArg arg1, int const_arg1,
TCGArg arg2, int const_arg2)
@@ -2085,8 +2107,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
break;
case INDEX_op_sub_i32:
case INDEX_op_sub_i64:
- tcg_out_alu(s, OPC_SUB_A1, args[0], args[1], const_args[1],
- args[2], const_args[2]);
+ tcg_out_sub(s, args[0], args[1], const_args[1], args[2], const_args[2]);
break;
case INDEX_op_and_i32: