[Qemu-devel] [PATCH 2/6] tcg-sparc: Improve tcg_out_movi for sparc64.

[Richard Henderson]

Generate sign-extended 32-bit constants with SETHI+XOR.
Otherwise tidy the routine to avoid the need for
conditional compilation and code duplication with movi_imm32.
---
 tcg/sparc/tcg-target.c |   27 +++++++++++++++------------
 1 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/tcg/sparc/tcg-target.c b/tcg/sparc/tcg-target.c
index b480ed6..78b26c9 100644
--- a/tcg/sparc/tcg-target.c
+++ b/tcg/sparc/tcg-target.c
@@ -314,22 +314,25 @@ static inline void tcg_out_movi_imm32(TCGContext *s, int 
ret, uint32_t arg)
 static inline void tcg_out_movi(TCGContext *s, TCGType type,
                                 int ret, tcg_target_long arg)
 {
-#if defined(__sparc_v9__) && !defined(__sparc_v8plus__)
-    if (!check_fit_tl(arg, 32) && (arg & ~0xffffffffULL) != 0) {
-        tcg_out_movi_imm32(s, TCG_REG_I4, arg >> 32);
+    /* All 32-bit constants, as well as 64-bit constants with
+       no high bits set go through movi_imm32.  */
+    if (TCG_TARGET_REG_BITS == 32
+        || type == TCG_TYPE_I32
+        || (arg & ~(tcg_target_long)0xffffffff) == 0) {
+        tcg_out_movi_imm32(s, ret, arg);
+    } else if (check_fit_tl(arg, 13)) {
+        /* A 13-bit constant sign-extended to 64-bits.  */
+        tcg_out_movi_imm13(s, ret, arg);
+    } else if (check_fit_tl(arg, 32)) {
+        /* A 32-bit constant sign-extended to 64-bits.  */
+        tcg_out_sethi(s, ret, ~arg);
+        tcg_out_arithi(s, ret, ret, (arg & 0x3ff) | -0x400, ARITH_XOR);
+    } else {
+        tcg_out_movi_imm32(s, TCG_REG_I4, arg >> (TCG_TARGET_REG_BITS / 2));
         tcg_out_arithi(s, TCG_REG_I4, TCG_REG_I4, 32, SHIFT_SLLX);
         tcg_out_movi_imm32(s, ret, arg);
         tcg_out_arith(s, ret, ret, TCG_REG_I4, ARITH_OR);
-    } else if (check_fit_tl(arg, 12))
-        tcg_out_movi_imm13(s, ret, arg);
-    else {
-        tcg_out_sethi(s, ret, arg);
-        if (arg & 0x3ff)
-            tcg_out_arithi(s, ret, ret, arg & 0x3ff, ARITH_OR);
     }
-#else
-    tcg_out_movi_imm32(s, ret, arg);
-#endif
 }
 
 static inline void tcg_out_ld_raw(TCGContext *s, int ret,
-- 
1.6.5.2