[Qemu-devel] [PATCH for-2.11 22/23] tcg/ppc: Look for shifted constants

[Richard Henderson <rth@twiddle.net>]

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 tcg/ppc/tcg-target.inc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tcg/ppc/tcg-target.inc.c b/tcg/ppc/tcg-target.inc.c
index bc14d2c9c6..4b32809217 100644
--- a/tcg/ppc/tcg-target.inc.c
+++ b/tcg/ppc/tcg-target.inc.c
@@ -598,6 +598,7 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
 {
     intptr_t tb_diff;
     int32_t high;
+    int lsb;
 
     tcg_debug_assert(TCG_TARGET_REG_BITS == 64 || type == TCG_TYPE_I32);
 
@@ -638,6 +639,14 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
         return;
     }
 
+    lsb = ctz64(arg);
+    high = arg >> lsb;
+    if (arg == (int16_t)arg) {
+        tcg_out32(s, ADDI | TAI(ret, 0, high));
+        tcg_out_shli64(s, ret, ret, lsb);
+        return;
+    }
+
     high = arg >> 31 >> 1;
     tcg_out_movi(s, TCG_TYPE_I32, ret, high);
     if (high) {
-- 
2.13.3