From: Robert Suchanek <robert.sucha...@mips.com>
These reloads happen because of different modes making elimination
non-trivial.
gcc/
* config/mips/mips.md: Add peepholes to remove silly moves.
Cherry-picked 85462a9dbf8d659bfb0417d354a0a4f9cd4b8e07
from https://github.com/MIPS/gcc
Signed-off-by: Robert Suchanek <robert.sucha...@imgtec.com>
Signed-off-by: Faraz Shahbazker <fshahbaz...@wavecomp.com>
Signed-off-by: Aleksandar Rakic <aleksandar.ra...@htecgroup.com>
---
gcc/config/mips/mips.md | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md
index 9813745dd95..5c2bfa4fa62 100644
--- a/gcc/config/mips/mips.md
+++ b/gcc/config/mips/mips.md
@@ -5137,6 +5137,18 @@
[(set_attr "move_type" "move,move,move,const,constN,load,store,mflo")
(set_attr "mode" "HI")])
+(define_peephole2
+ [(set (match_operand:HI 0 "register_operand")
+ (match_operand:HI 1 "register_operand"))
+ (set (match_operand:SI 2 "register_operand")
+ (match_operand:SI 3 "register_operand"))]
+ "TARGET_MIPS16
+ && REGNO (operands[1]) == REGNO (operands[2])
+ && REGNO (operands[0]) == REGNO (operands[3])
+ && peep2_reg_dead_p (2, operands[3])"
+ [(const_int 0)]
+ "")
+
;; On the mips16, we can split lh $r,N($r) into an add and a load,
;; when the original load is a 4 byte instruction but the add and the
;; load are 2 2 byte instructions.
@@ -5213,6 +5225,18 @@
[(set_attr "move_type" "move,move,move,const,constN,load,store,mflo")
(set_attr "mode" "QI")])
+(define_peephole2
+ [(set (match_operand:QI 0 "register_operand")
+ (match_operand:QI 1 "register_operand"))
+ (set (match_operand:SI 2 "register_operand")
+ (match_operand:SI 3 "register_operand"))]
+ "TARGET_MIPS16
+ && REGNO (operands[1]) == REGNO (operands[2])
+ && REGNO (operands[0]) == REGNO (operands[3])
+ && peep2_reg_dead_p (2, operands[3])"
+ [(const_int 0)]
+ "")
+
;; On the mips16, we can split lb $r,N($r) into an add and a load,
;; when the original load is a 4 byte instruction but the add and the
;; load are 2 2 byte instructions.
--
2.34.1
