[PATCH] NFC: use more readable pattern to clean high 32 bits

[Jiufu Guo <guojiufu@linux.ibm.com>]

Hi,

This patch is just using a more readable pattern for "rldicl x,x,0,32"
to clean high 32bits.
Old pattern looks like: r118:DI=zero_extend(r120:DI#0)
new pattern looks like: r118:DI=r120:DI&0xffffffff

Bootstrap and regtest pass on ppc64{,le}.
Is this ok for trunk?

BR,
Jeff (Jiufu)

gcc/ChangeLog:

	* config/rs6000/rs6000.cc (rs6000_emit_set_long_const): Update
	zero_extend(reg:DI#0) to reg:DI&0xffffffff

---
 gcc/config/rs6000/rs6000.cc | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index eb7ad5e954f..5efe9b22d8b 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -10267,10 +10267,7 @@ rs6000_emit_set_long_const (rtx dest, HOST_WIDE_INT c)
 	emit_move_insn (copy_rtx (temp),
 			gen_rtx_IOR (DImode, copy_rtx (temp),
 				     GEN_INT (ud1)));
-      emit_move_insn (dest,
-		      gen_rtx_ZERO_EXTEND (DImode,
-					   gen_lowpart (SImode,
-							copy_rtx (temp))));
+      emit_move_insn (dest, gen_rtx_AND (DImode, temp, GEN_INT (0xffffffff)));
     }
   else if (ud1 == ud3 && ud2 == ud4)
     {
-- 
2.17.1