[gcc(refs/users/meissner/heads/work067)] Fix SFmode subreg of DImode and TImode

[Michael Meissner <meissner@gcc.gnu.org>]

https://gcc.gnu.org/g:ac07ff1369cd50d70c689933ac7e46bfa70eb229

commit ac07ff1369cd50d70c689933ac7e46bfa70eb229
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Mon Sep 6 17:16:25 2021 -0400

    Fix SFmode subreg of DImode and TImode
    
    2021-09-06  Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * config/rs6000/rs6000.c (rs6000_emit_move_si_sf_subreg): Deal
            with SUBREGs of TImode and DImode.

Diff:
---
 gcc/config/rs6000/rs6000.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index b9ebd56c993..7bbf29a3e1c 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -10942,6 +10942,16 @@ rs6000_emit_move_si_sf_subreg (rtx dest, rtx source, machine_mode mode)
 	  return true;
 	}
 
+      /* In case we are given a SUBREG for a larger type, reduce it to
+	 SImode.  */
+      if (mode == SFmode && GET_MODE_SIZE (inner_mode) > 4)
+	{
+	  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 == SImode)
 	{
 	  emit_insn (gen_movsf_from_si (dest, inner_source));