[gcc(refs/users/meissner/heads/work221-float)] Use xvcvdpsp instead of xscvdpspn.

[Michael Meissner]

https://gcc.gnu.org/g:00340983fdc2e7e8b86d93abaa245851abe82365

commit 00340983fdc2e7e8b86d93abaa245851abe82365
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Fri Sep 12 12:11:15 2025 -0400

    Use xvcvdpsp instead of xscvdpspn.
    
    2025-09-12  Michael Meissner  <meissner@linux.ibm.com>
    
    gcc/
    
            * config/rs6000/rs6000.md (trunc<mode>bf2): Use xvcvdpsp instead of
            xscvdpspn.
            * config/rs6000/vsx.md (vsx_xvcvdpsp_<mode>): New insn.
            (vsx_xscvdpspn_sf): Delete.

Diff:
---
 gcc/config/rs6000/rs6000.md |  7 ++-----
 gcc/config/rs6000/vsx.md    | 18 ++++++++++--------
 2 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md
index 4fa59ab54824..7862ad526f90 100644
--- a/gcc/config/rs6000/rs6000.md
+++ b/gcc/config/rs6000/rs6000.md
@@ -5920,7 +5920,7 @@
 
 ;; Convert SFmode/DFmode to BFmode.
 ;; 2 instructions are generated:
-;;	XSCVDPSPN	-- convert SFmode/DFmode scalar to V4SFmode
+;;	XVCVDPSPN	-- convert SFmode/DFmode scalar to V4SFmode
 ;;	XVCVSPBF16	-- convert V4SFmode to even V8BFmode
 
 (define_insn_and_split "trunc<mode>bf2"
@@ -5940,10 +5940,7 @@
   if (GET_CODE (op2) == SCRATCH)
     op2 = gen_reg_rtx (V4SFmode);
 
-  emit_insn (GET_MODE (op1) == SFmode
-	     ? gen_vsx_xscvdpspn_sf (op2, op1)
-	     : gen_vsx_xscvdpspn (op2, op1));
-
+  emit_insn (gen_vsx_xvcvdpsp_<mode> (op2, op1));
   emit_insn (gen_vsx_xvcvspbf16_bf (op0, op2));
   DONE;
 }
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index 111457b8fe2e..7d98d9865d7b 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -2436,6 +2436,16 @@
   "xvcvdpsp %x0,%x1"
   [(set_attr "type" "vecdouble")])
 
+;; Needed for converting SF/DFmode to BFmode
+(define_insn "vsx_xvcvdpsp_<mode>"
+  [(set (match_operand:V4SF 0 "vsx_register_operand" "=wa")
+	(unspec:V4SF [(match_operand:SFDF 1 "vsx_register_operand" "wa")
+		      (const_int 0)]
+		     UNSPEC_VSX_CVSPDP))]
+  "VECTOR_UNIT_VSX_P (V2DFmode)"
+  "xvcvdpsp %x0,%x1"
+  [(set_attr "type" "fp")])
+
 ;; xscvspdp, represent the scalar SF type as V4SF
 (define_insn "vsx_xscvspdp"
   [(set (match_operand:DF 0 "vsx_register_operand" "=wa")
@@ -2511,14 +2521,6 @@
   "xscvdpspn %x0,%x1"
   [(set_attr "type" "fp")])
 
-(define_insn "vsx_xscvdpspn_sf"
-  [(set (match_operand:V4SF 0 "vsx_register_operand" "=wa")
-	(unspec:V4SF [(match_operand:SF 1 "vsx_register_operand" "wa")]
-		     UNSPEC_VSX_CVDPSPN))]
-  "TARGET_XSCVDPSPN"
-  "xscvdpspn %x0,%x1"
-  [(set_attr "type" "fp")])
-
 (define_insn "vsx_xscvspdpn"
   [(set (match_operand:DF 0 "vsx_register_operand" "=wa")
 	(unspec:DF [(match_operand:V4SF 1 "vsx_register_operand" "wa")]