[gcc r10-10948] rs6000: Disparage lfiwzx and similar

[Segher Boessenkool]

https://gcc.gnu.org/g:d99d74d8b1b517784e3b05b271b977eb6603121f

commit r10-10948-gd99d74d8b1b517784e3b05b271b977eb6603121f
Author: Segher Boessenkool <segher@kernel.crashing.org>
Date:   Sun Jan 2 14:08:35 2022 +0000

    rs6000: Disparage lfiwzx and similar
    
    RA now chooses GEN_OR_VSX_REGS in most cases.  This is great in most
    cases, but we often (or always?) use {l,st}{f,xs}iwzx now, which is
    problematic because the integer load and store insns can use cheaper
    addressing modes.  We can fix that by putting a small penalty on the
    instruction alternatives for those.
    
    2022-04-21  Segher Boessenkool  <segher@kernel.crashing.org>
    
            PR target/103197
            PR target/102146
            * config/rs6000/rs6000.md (zero_extendqi<mode>2 for EXTQI): Disparage
            the "Z" alternatives in {l,st}{f,xs}iwzx.
            (zero_extendhi<mode>2 for EXTHI): Ditto.
            (zero_extendsi<mode>2 for EXTSI): Ditto.
            (*movsi_internal1): Ditto.
            (*mov<mode>_internal1 for QHI): Ditto.
            (movsd_hardfloat): Ditto.
    
    (cherry picked from commit 26fa464f42622c60d6929720dd37143a21054ede)

Diff:
---
 gcc/config/rs6000/rs6000.md | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 61a14fb5b9f..129b87bbc12 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -782,8 +782,8 @@
 ;; complex forms.  Basic data transfer is done later.
 
 (define_insn "zero_extendqi<mode>2"
-  [(set (match_operand:EXTQI 0 "gpc_reg_operand" "=r,r,^wa,^v")
-	(zero_extend:EXTQI (match_operand:QI 1 "reg_or_mem_operand" "m,r,Z,v")))]
+  [(set (match_operand:EXTQI 0 "gpc_reg_operand" "=r,r,wa,^v")
+	(zero_extend:EXTQI (match_operand:QI 1 "reg_or_mem_operand" "m,r,?Z,v")))]
   ""
   "@
    lbz%U1%X1 %0,%1
@@ -836,8 +836,8 @@
 
 
 (define_insn "zero_extendhi<mode>2"
-  [(set (match_operand:EXTHI 0 "gpc_reg_operand" "=r,r,^wa,^v")
-	(zero_extend:EXTHI (match_operand:HI 1 "reg_or_mem_operand" "m,r,Z,v")))]
+  [(set (match_operand:EXTHI 0 "gpc_reg_operand" "=r,r,wa,^v")
+	(zero_extend:EXTHI (match_operand:HI 1 "reg_or_mem_operand" "m,r,?Z,v")))]
   ""
   "@
    lhz%U1%X1 %0,%1
@@ -891,7 +891,7 @@
 
 (define_insn "zero_extendsi<mode>2"
   [(set (match_operand:EXTSI 0 "gpc_reg_operand" "=r,r,d,wa,wa,r,wa")
-	(zero_extend:EXTSI (match_operand:SI 1 "reg_or_mem_operand" "m,r,Z,Z,r,wa,wa")))]
+	(zero_extend:EXTSI (match_operand:SI 1 "reg_or_mem_operand" "m,r,?Z,?Z,r,wa,wa")))]
   ""
   "@
    lwz%U1%X1 %0,%1
@@ -6941,7 +6941,7 @@
   [(set (match_operand:SI 0 "nonimmediate_operand"
 	  "=r,         r,
 	   r,          d,          v,
-	   m,          Z,          Z,
+	   m,          ?Z,         ?Z,
 	   r,          r,          r,          r,
 	   wa,         wa,         wa,         v,
 	   wa,         v,          v,
@@ -6949,7 +6949,7 @@
 	   r,          *h,         *h")
 	(match_operand:SI 1 "input_operand"
 	  "r,          U,
-	   m,          Z,          Z,
+	   m,          ?Z,         ?Z,
 	   r,          d,          v,
 	   I,          L,          eI,         n,
 	   wa,         O,          wM,         wB,
@@ -7230,11 +7230,11 @@
 ;;		MTVSRWZ     MF%1       MT%1       NOP
 (define_insn "*mov<mode>_internal"
   [(set (match_operand:QHI 0 "nonimmediate_operand"
-		"=r,        r,         wa,        m,         Z,         r,
+		"=r,        r,         wa,        m,         ?Z,        r,
 		 wa,        wa,        wa,        v,         ?v,        r,
 		 wa,        r,         *c*l,      *h")
 	(match_operand:QHI 1 "input_operand"
-		"r,         m,         Z,         r,         wa,        i,
+		"r,         m,         ?Z,        r,         wa,        i,
 		 wa,        O,         wM,        wB,        wS,        wa,
 		 r,         *h,        r,         0"))]
   "gpc_reg_operand (operands[0], <MODE>mode)
@@ -7413,10 +7413,10 @@
 ;;	FMR          MR         MT%0       MF%1       NOP
 (define_insn "movsd_hardfloat"
   [(set (match_operand:SD 0 "nonimmediate_operand"
-	 "=!r,       d,         m,         Z,         ?d,        ?r,
+	 "=!r,       d,         m,         ?Z,        ?d,        ?r,
 	  f,         !r,        *c*l,      !r,        *h")
 	(match_operand:SD 1 "input_operand"
-	 "m,         Z,         r,         wx,        r,         d,
+	 "m,         ?Z,        r,         wx,        r,         d,
 	  f,         r,         r,         *h,        0"))]
   "(register_operand (operands[0], SDmode)
    || register_operand (operands[1], SDmode))