[PATCH 75/82] tcg: Use umax in ussub if available

[Richard Henderson]

Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
 tcg/tcg-op.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index 6c76cecc501..49c187c3784 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -1147,10 +1147,15 @@ static void gen_umin(TCGType type, TCGTemp *dst, 
TCGTemp *src1, TCGTemp *src2)
 static void gen_ussub(TCGType type, TCGTemp *dst, TCGTemp *src1, TCGTemp *src2)
 {
     TCGTemp *tmp = tcg_temp_new_internal(type, TEMP_EBB);
-    TCGTemp *zero = tcg_constant_internal(type, 0);
 
-    gen_sub(type, tmp, src1, src2);
-    gen_movcond(type, TCG_COND_LTU, dst, src1, src2, zero, tmp);
+    if (tcg_op_supported(INDEX_op_umax, type, 0)) {
+        gen_umax(type, tmp, src1, src2);
+        gen_sub(type, dst, tmp, src2);
+    } else {
+        TCGTemp *zero = tcg_constant_internal(type, 0);
+        gen_sub(type, tmp, src1, src2);
+        gen_movcond(type, TCG_COND_LTU, dst, src1, src2, zero, tmp);
+    }
     tcg_temp_free_internal(tmp);
 }
 
-- 
2.53.0