[gcc(refs/users/meissner/heads/work067)] Revert patch.

[Michael Meissner]

https://gcc.gnu.org/g:9620d186d5b3f29854ca443d4643359cf21ceeb9

commit 9620d186d5b3f29854ca443d4643359cf21ceeb9
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Wed Sep 8 13:56:44 2021 -0400

    Revert patch.
    
    2021-09-08  Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            Revert patch
            * config/rs6000/rs6000.c (rs6000_emit_move_si_sf_subreg): Deal
            with SUBREGs of TImode and DImode.
            * config/rs6000/rs6000.md (SI_DI_TI): New mode iterator.
            (movsf_from_<mode>): Replace movsf_from_si to add support for
            subregs of DImode and TImode.

Diff:
---
 gcc/config/rs6000/rs6000.c  | 17 ++++++++++++-----
 gcc/config/rs6000/rs6000.md | 15 ++++-----------
 2 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index bd1ae1f8d6e..da5abe6f7b5 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -10942,16 +10942,23 @@ rs6000_emit_move_si_sf_subreg (rtx dest, rtx source, machine_mode mode)
 	  return true;
 	}
 
-      /* Deal with subregs of SI/DI/TImode.  */
-      if (mode == SFmode && inner_mode == TImode)
+      /* In case we are given a SUBREG for a larger type, reduce it to
+	 SImode.  */
+      if (mode == SFmode && GET_MODE_SIZE (inner_mode) > 4)
 	{
-	  emit_insn (gen_movsf_from_ti (dest, inner_source));
+	  rtx tmp = gen_reg_rtx (SImode);
+	  emit_move_insn (tmp, gen_lowpart (SImode, source));
+	  emit_insn (gen_movsf_from_si (dest, tmp));
 	  return true;
 	}
 
-      if (mode == SFmode && inner_mode == DImode)
+      /* In case we are given a SUBREG for a larger type, reduce it to
+	 SImode.  */
+      if (mode == SFmode && GET_MODE_SIZE (inner_mode) > 4)
 	{
-	  emit_insn (gen_movsf_from_di (dest, inner_source));
+	  rtx tmp = gen_reg_rtx (SImode);
+	  emit_move_insn (tmp, gen_lowpart (SImode, source));
+	  emit_insn (gen_movsf_from_si (dest, tmp));
 	  return true;
 	}
 
diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index bce19310321..d6af66a1728 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -466,9 +466,6 @@
 ; Any supported integer mode.
 (define_mode_iterator INT [QI HI SI DI TI PTI])
 
-; Any supported integer mode that is at least 32-bits in size.
-(define_mode_iterator SI_DI_TI [SI DI TI])
-
 ; Any supported integer mode that fits in one register.
 (define_mode_iterator INT1 [QI HI SI (DI "TARGET_POWERPC64")])
 
@@ -7864,11 +7861,11 @@
 
 ;;	    LWZ          LFS        LXSSP      LXSSPX     STW        STFIWX
 ;;	    STXSIWX      GPR->VSX   VSX->GPR   GPR->GPR
-(define_insn_and_split "movsf_from_<mode>"
+(define_insn_and_split "movsf_from_si"
   [(set (match_operand:SF 0 "nonimmediate_operand"
 	    "=!r,       f,         v,         wa,        m,         Z,
 	     Z,         wa,        ?r,        !r")
-	(unspec:SF [(match_operand:SI_DI_TI 1 "input_operand" 
+	(unspec:SF [(match_operand:SI 1 "input_operand" 
 	    "m,         m,         wY,        Z,         r,         f,
 	     wa,        r,         wa,        r")]
 		   UNSPEC_SF_FROM_SI))
@@ -7877,7 +7874,7 @@
              X,         r,         X,         X"))]
   "TARGET_NO_SF_SUBREG
    && (register_operand (operands[0], SFmode)
-       || register_operand (operands[1], <MODE>mode))"
+       || register_operand (operands[1], SImode))"
   "@
    lwz%U1%X1 %0,%1
    lfs%U1%X1 %0,%1
@@ -7892,16 +7889,12 @@
 
   "&& reload_completed
    && vsx_reg_sfsubreg_ok (operands[0], SFmode)
-   && int_reg_operand_not_pseudo (operands[1], <MODE>mode)"
+   && int_reg_operand_not_pseudo (operands[1], SImode)"
   [(const_int 0)]
 {
   rtx op0 = operands[0];
   rtx op1 = operands[1];
   rtx op2 = operands[2];
-
-  if (GET_MODE (op1) != SImode)
-    op1 = gen_lowpart (SImode, op1);
-
   rtx op1_di = gen_rtx_REG (DImode, REGNO (op1));
 
   /* Move SF value to upper 32-bits for xscvspdpn.  */