[Qemu-devel] [PATCH 1/7] tcg-sparc: Implement neg.

[Richard Henderson]

The fallback implementation of "ret = 0 - arg1" isn't ideal,
first because of the extra tcg op to load the zero, and second
because we fail to handle zero as %g0 for arg1 of the sub.

Signed-off-by: Richard Henderson <r...@twiddle.net>
---
 tcg/sparc/tcg-target.c |   13 +++++++++++++
 tcg/sparc/tcg-target.h |    5 +++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/tcg/sparc/tcg-target.c b/tcg/sparc/tcg-target.c
index 5b4347a..f5cf95d 100644
--- a/tcg/sparc/tcg-target.c
+++ b/tcg/sparc/tcg-target.c
@@ -1234,6 +1234,10 @@ static inline void tcg_out_op(TCGContext *s, int opc, 
const TCGArg *args,
         c = ARITH_UMUL;
         goto gen_arith;
 
+    OP_32_64(neg):
+       c = ARITH_SUB;
+       goto gen_arith1;
+
     case INDEX_op_div_i32:
         tcg_out_div32(s, args[0], args[1], args[2], const_args[2], 0);
         break;
@@ -1392,6 +1396,10 @@ static inline void tcg_out_op(TCGContext *s, int opc, 
const TCGArg *args,
         tcg_out_arithc(s, args[0], args[1], args[2], const_args[2], c);
         break;
 
+    gen_arith1:
+       tcg_out_arithc(s, args[0], TCG_REG_G0, args[1], const_args[1], c);
+       break;
+
     default:
         fprintf(stderr, "unknown opcode 0x%x\n", opc);
         tcg_abort();
@@ -1431,6 +1439,8 @@ static const TCGTargetOpDef sparc_op_defs[] = {
     { INDEX_op_shr_i32, { "r", "r", "rJ" } },
     { INDEX_op_sar_i32, { "r", "r", "rJ" } },
 
+    { INDEX_op_neg_i32, { "r", "rJ" } },
+
     { INDEX_op_brcond_i32, { "r", "rJ" } },
     { INDEX_op_setcond_i32, { "r", "r", "rJ" } },
 
@@ -1484,6 +1494,9 @@ static const TCGTargetOpDef sparc_op_defs[] = {
     { INDEX_op_shl_i64, { "r", "r", "rJ" } },
     { INDEX_op_shr_i64, { "r", "r", "rJ" } },
     { INDEX_op_sar_i64, { "r", "r", "rJ" } },
+
+    { INDEX_op_neg_i64, { "r", "rJ" } },
+
     { INDEX_op_ext32s_i64, { "r", "ri" } },
     { INDEX_op_ext32u_i64, { "r", "ri" } },
 
diff --git a/tcg/sparc/tcg-target.h b/tcg/sparc/tcg-target.h
index d27ed5a..66031ba 100644
--- a/tcg/sparc/tcg-target.h
+++ b/tcg/sparc/tcg-target.h
@@ -91,15 +91,16 @@ enum {
 #define TCG_TARGET_HAS_div_i32
 #define TCG_TARGET_HAS_div_i64
 
+#define TCG_TARGET_HAS_neg_i32
+
 #if TCG_TARGET_REG_BITS == 64
 #define TCG_TARGET_HAS_ext32s_i64
 #define TCG_TARGET_HAS_ext32u_i64
+#define TCG_TARGET_HAS_neg_i64
 #endif
 
 //#define TCG_TARGET_HAS_bswap32_i32
 //#define TCG_TARGET_HAS_bswap64_i64
-//#define TCG_TARGET_HAS_neg_i32
-//#define TCG_TARGET_HAS_neg_i64
 
 
 /* Note: must be synced with dyngen-exec.h and Makefile.target */
-- 
1.6.6