Replace UNSPEC with RTL code for extendditi2.
When I submitted my patch on March 12th for extendditi2, Segher wished I
had removed the use of the UNSPEC for the vextsd2q instruction. This
patch rewrites extendditi2_vector to use VEC_SELECT rather than UNSPEC.
2022-05-13 Michael Meissner <meiss...@linux.ibm.com>
gcc/
* config/rs6000/vsx.md (UNSPEC_EXTENDDITI2): Delete.
(extendditi2_vector): Rewrite to use VEC_SELECT as a
define_expand.
(extendditi2_vector2): New insn.
---
gcc/config/rs6000/vsx.md | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index a1a1ce95195..c091e5e2f47 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -358,7 +358,6 @@ (define_c_enum "unspec"
UNSPEC_VSX_FIRST_MISMATCH_EOS_INDEX
UNSPEC_XXGENPCV
UNSPEC_MTVSBM
- UNSPEC_EXTENDDITI2
UNSPEC_VCNTMB
UNSPEC_VEXPAND
UNSPEC_VEXTRACT
@@ -5083,10 +5082,25 @@ (define_insn_and_split "extendditi2"
(set_attr "type" "shift,load,vecmove,vecperm,load")])
;; Sign extend 64-bit value in TI reg, word 1, to 128-bit value in TI reg
-(define_insn "extendditi2_vector"
+(define_expand "extendditi2_vector"
+ [(use (match_operand:TI 0 "gpc_reg_operand"))
+ (use (match_operand:TI 1 "gpc_reg_operand"))]
+ "TARGET_POWER10"
+{
+ rtx dest = operands[0];
+ rtx src_v2di = gen_lowpart (V2DImode, operands[1]);
+ rtx element = GEN_INT (VECTOR_ELEMENT_SCALAR_64BIT);
+
+ emit_insn (gen_extendditi2_vector2 (dest, src_v2di, element));
+ DONE;
+})
+
+(define_insn "extendditi2_vector2"
[(set (match_operand:TI 0 "gpc_reg_operand" "=v")
- (unspec:TI [(match_operand:TI 1 "gpc_reg_operand" "v")]
- UNSPEC_EXTENDDITI2))]
+ (sign_extend:TI
+ (vec_select:DI
+ (match_operand:V2DI 1 "gpc_reg_operand" "v")
+ (parallel [(match_operand 2 "vsx_scalar_64bit" "wD")]))))]
"TARGET_POWER10"
"vextsd2q %0,%1"
[(set_attr "type" "vecexts")])
--
2.35.3
--
Michael Meissner, IBM
PO Box 98, Ayer, Massachusetts, USA, 01432
email: meiss...@linux.ibm.com
