Hello,

Below patch is bootstrapped and regtested on powerpc64*-linux-gnu with
no regressions.

This patch depends on:
https://www.mail-archive.com/[email protected]/msg407092.html
for future-vsx stanza support and should be committed after the patch
is commited.

Changes from v3:

        - Tested on both little-endian and big-endian targets.
        - Added documentation and explanatory comments.
        - Reorganized builtins into future-vsx and future-altivec
        stanzas.
        - Fixed mode mismatches in builtin definitions and md patterns
        of altivec_vupkint4tobf16 and altivec_vupkint8tobf16.
        - Updated and corrected testcases as requested during review.

Changes from v2:
        - Add endian compensation sequence for LE so that the logical
        vector element ordering matches BE semantics.

Changes from v1:
        - Add missing author line:
        2025-03-11  Kishan Parmar  <[email protected]>

Thank you,
Kishan

Add support for vector uncompress and unpack instructions
proposed in RFC02691.  These instructions may or may not be added to a future
Power processor, and the names of the builtins may change in the future.

The instructions are exposed through new builtins and intrinsics
interfaces and are enabled when compiling with -mcpu=future.

This patch adds RTL patterns for vector uncompress (nibble, byte, and
halfword) and unpack operations in altivec.md, along with the
corresponding builtin definitions in rs6000-builtins.def and overload
entries in rs6000-overload.def.

The following new builtins are provided:

vector unsigned short vec_uncompresshn (vector unsigned char,
                                        vector unsigned int)
vector unsigned int vec_uncompresshb (vector unsigned short,
                                      vector unsigned short)
vector unsigned long long vec_uncompresshh (vector unsigned int,
                                            vector unsigned char)
vector unsigned short vec_uncompressln (vector unsigned char,
                                        vector unsigned int)
vector unsigned int vec_uncompresslb (vector unsigned short,
                                      vector unsigned short)
vector unsigned long long vec_uncompresslh (vector unsigned int,
                                            vector unsigned char)
vector signed char vec_unpack_hsn_to_byte (vector unsigned long long)
vector signed char vec_unpack_lsn_to_byte (vector unsigned long long)
vector unsigned char vec_unpack_int4_to_bf16 (vector unsigned short,
                                              const int<2>)
vector unsigned char vec_unpack_int8_to_bf16 (vector unsigned short,
                                              const int<1>)
vector float vec_unpack_int4_to_fp32 (vector unsigned int, const int<3>)
vector float vec_unpack_int8_to_fp32 (vector unsigned int, const int<2>)

2026-06-23  Kishan Parmar  <[email protected]>

gcc/ChangeLog:
        * config/rs6000/altivec.md (UNSPEC_VUCMPRHN): New unspec entry.
        (UNSPEC_VUCMPRLN): Likewise.
        (UNSPEC_VUCMPRHB): Likewise.
        (UNSPEC_VUCMPRLB): Likewise.
        (UNSPEC_VUCMPRHH): Likewise.
        (UNSPEC_VUCMPRLH): Likewise.
        (UNSPEC_VUPKHSNTOB): Likewise.
        (UNSPEC_VUPKLSNTOB): Likewise.
        (UNSPEC_VUPKINT4TOBF16): Likewise.
        (UNSPEC_VUPKINT8TOBF16): Likewise.
        (UNSPEC_VUPKINT4TOFP32): Likewise.
        (UNSPEC_VUPKINT8TOFP32): Likewise.
        (vu_hl): New attribute.
        (vu_lh): Likewise.
        (VUPKNTOB): New int iterator.
        (altivec_vupkhsntob): New define_insn.
        (altivec_vupklsntob): Likewise.
        (altivec_vupkint4tobf16): Likewise.
        (altivec_vupkint8tobf16): Likewise.
        (altivec_vupkint4tofp32): Likewise.
        (altivec_vupkint8tofp32): Likewise.
        (vucmpr_splat): New attribute.
        (vucmpr_pcv): Likewise.
        (vucmpr_uim): Likewise.
        (VUCMPR_N): New int iterator.
        (VUCMPR_B): Likewise.
        (VUCMPR_H): Likewise.
        (altivec_vucmpr<vu_hl>n): New define_expand.
        (altivec_vucmpr<vu_hl>n_direct): New define_insn for vucmpr<vu_hl>n.
        (altivec_vucmpr<vu_hl>b): New define_expand.
        (altivec_vucmpr<vu_hl>b_direct): New define_insn for vucmpr<vu_hl>b.
        (altivec_vucmpr<vu_hl>h): New define_expand.
        (altivec_vucmpr<vu_hl>h_direct): New define_insn for vucmpr<vu_hl>h.
        * config/rs6000/rs6000-builtins.def: Add vector uncompress and unpack
        builtins under [future].
        * config/rs6000/rs6000-overload.def: Add vec_uncompress* and vec_unpack*
        interfaces.

gcc/testsuite/ChangeLog:
        * gcc/testsuite/gcc.target/powerpc/future-vucmpr-altivec.c: New test.
        * gcc/testsuite/gcc.target/powerpc/future-vucmpr-vsx.c: Likewise.
        * gcc/testsuite/gcc.target/powerpc/future-vupk.c: Likewise.
---
 gcc/config/rs6000/altivec.md                  | 362 ++++++++++++++++++
 gcc/config/rs6000/rs6000-builtins.def         |  37 ++
 gcc/config/rs6000/rs6000-overload.def         |  47 +++
 .../powerpc/future-vucmpr-altivec.c           |  50 +++
 .../gcc.target/powerpc/future-vucmpr-vsx.c    |  61 +++
 .../gcc.target/powerpc/future-vupk.c          |  51 +++
 6 files changed, 608 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/powerpc/future-vucmpr-altivec.c
 create mode 100644 gcc/testsuite/gcc.target/powerpc/future-vucmpr-vsx.c
 create mode 100644 gcc/testsuite/gcc.target/powerpc/future-vupk.c

diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index 129f56245cd..32a6d3f3eb4 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -171,6 +171,18 @@
    UNSPEC_SLDB
    UNSPEC_SRDB
    UNSPEC_VECTOR_SHIFT
+   UNSPEC_VUCMPRHN
+   UNSPEC_VUCMPRLN
+   UNSPEC_VUCMPRHB
+   UNSPEC_VUCMPRLB
+   UNSPEC_VUCMPRHH
+   UNSPEC_VUCMPRLH
+   UNSPEC_VUPKHSNTOB
+   UNSPEC_VUPKLSNTOB
+   UNSPEC_VUPKINT4TOBF16
+   UNSPEC_VUPKINT8TOBF16
+   UNSPEC_VUPKINT4TOFP32
+   UNSPEC_VUPKINT8TOFP32
 ])
 
 (define_c_enum "unspecv"
@@ -4826,3 +4838,353 @@
                                  (match_dup 3)]
                                 UNSPEC_BCD_ADD_SUB)
                    (match_dup 4)))])])
+
+(define_int_attr vu_hl [(UNSPEC_VUPKHSNTOB "h") (UNSPEC_VUPKLSNTOB "l")
+                       (UNSPEC_VUCMPRHN "h") (UNSPEC_VUCMPRLN "l")
+                       (UNSPEC_VUCMPRHB "h") (UNSPEC_VUCMPRLB "l")
+                       (UNSPEC_VUCMPRHH "h") (UNSPEC_VUCMPRLH "l")])
+
+(define_int_attr vu_lh [(UNSPEC_VUPKHSNTOB "l") (UNSPEC_VUPKLSNTOB "h")
+                       (UNSPEC_VUCMPRHN "l") (UNSPEC_VUCMPRLN "h")
+                       (UNSPEC_VUCMPRHB "l") (UNSPEC_VUCMPRLB "h")
+                       (UNSPEC_VUCMPRHH "l") (UNSPEC_VUCMPRLH "h")])
+
+;; Vector unpack instructions for future.
+
+(define_int_iterator VUPKNTOB [UNSPEC_VUPKHSNTOB UNSPEC_VUPKLSNTOB])
+
+(define_insn "altivec_vupk<vu_hl>sntob_direct"
+  [(set (match_operand:V16QI 0 "altivec_register_operand" "=v")
+       (unspec:V16QI [(match_operand:V2DI 1 "altivec_register_operand" "v")]
+                     VUPKNTOB))]
+  "TARGET_FUTURE && TARGET_VSX"
+  "vupk<vu_hl>sntob %0, %1"
+  [(set_attr "type" "vecperm")])
+
+;; Unpack signed nibbles to bytes.
+;; For big-endian, generates:
+;;   vupk<vu_hl>sntob operands[0], operands[1]
+;; For little-endian, generates (requires VSX for xxbrq):
+;;   vupk<vu_lh>sntob operands[0], operands[1]
+;;   xxbrq operands[0], operands[0]
+;; TARGET_VSX is required because the builtin operates on V2DI (vector
+;; unsigned long long), which requires -mvsx. On little-endian systems,
+;; the endian compensation also uses the VSX xxbrq instruction.
+
+(define_expand "altivec_vupk<vu_hl>sntob"
+  [(set (match_operand:V16QI 0 "altivec_register_operand")
+       (unspec:V16QI [(match_operand:V2DI 1 "altivec_register_operand")]
+                     VUPKNTOB))]
+  "TARGET_FUTURE && TARGET_VSX"
+{
+  if (BYTES_BIG_ENDIAN)
+    emit_insn (gen_altivec_vupk<vu_hl>sntob_direct (operands[0],
+                                                   operands[1]));
+  else
+    {
+      emit_insn (gen_altivec_vupk<vu_lh>sntob_direct (operands[0],
+                                                     operands[1]));
+      emit_insn (gen_p9_xxbrq_v16qi (operands[0], operands[0]));
+    }
+  DONE;
+})
+
+(define_insn "altivec_vupkint4tobf16"
+  [(set (match_operand:V16QI 0 "altivec_register_operand" "=v")
+       (unspec:V16QI [(match_operand:V8HI 1 "altivec_register_operand" "v")
+                      (match_operand:QI 2 "const_0_to_3_operand" "i")]
+                     UNSPEC_VUPKINT4TOBF16))]
+  "TARGET_FUTURE"
+  "vupkint4tobf16 %0, %1, %2"
+  [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vupkint8tobf16"
+  [(set (match_operand:V16QI 0 "altivec_register_operand" "=v")
+       (unspec:V16QI [(match_operand:V8HI 1 "altivec_register_operand" "v")
+                      (match_operand:QI 2 "const_0_to_1_operand" "i")]
+                     UNSPEC_VUPKINT8TOBF16))]
+  "TARGET_FUTURE"
+  "vupkint8tobf16 %0, %1, %2"
+  [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vupkint4tofp32"
+  [(set (match_operand:V4SF 0 "altivec_register_operand" "=v")
+        (unspec:V4SF [(match_operand:V4SI 1 "altivec_register_operand" "v")
+                     (match_operand:QI 2 "const_0_to_7_operand" "i")]
+                    UNSPEC_VUPKINT4TOFP32))]
+  "TARGET_FUTURE"
+  "vupkint4tofp32 %0, %1, %2"
+  [(set_attr "type" "vecperm")])
+
+(define_insn "altivec_vupkint8tofp32"
+  [(set (match_operand:V4SF 0 "altivec_register_operand" "=v")
+       (unspec:V4SF [(match_operand:V4SI 1 "altivec_register_operand" "v")
+                     (match_operand:QI 2 "const_0_to_3_operand" "i")]
+                    UNSPEC_VUPKINT8TOFP32))]
+  "TARGET_FUTURE"
+  "vupkint8tofp32 %0, %1, %2"
+  [(set_attr "type" "vecperm")])
+
+;; Vector uncompress instructions for future.
+
+;; VSX splat values for vector uncompress instructions for little endian.
+(define_int_attr vucmpr_splat [(UNSPEC_VUCMPRHN "3")
+                              (UNSPEC_VUCMPRLN "2")
+                              (UNSPEC_VUCMPRHB "7")
+                              (UNSPEC_VUCMPRLB "6")
+                              (UNSPEC_VUCMPRHH "15")
+                              (UNSPEC_VUCMPRLH "14")])
+
+;; Altivec PCV(Permute Control Vector) mask values for vperm used in
+;; little endian.
+(define_int_attr vucmpr_pcv [(UNSPEC_VUCMPRHN "0x0f0e0d0c")
+                            (UNSPEC_VUCMPRLN "0x0b0a0908")
+                            (UNSPEC_VUCMPRHB "0x0f0e0000")
+                            (UNSPEC_VUCMPRLB "0x0d0c0000")])
+
+;; Values for UIM which are used in vinsw instruction which will be used in
+;; little-endian, to know in vector.
+(define_int_attr vucmpr_uim [(UNSPEC_VUCMPRHN "4") (UNSPEC_VUCMPRLN "0")
+                            (UNSPEC_VUCMPRHB "2") (UNSPEC_VUCMPRLB "0")])
+
+/* On little-endian systems, the selector/mask layout does not match
+   the architectural element ordering used by the vector uncompress
+   instructions. Byte-wise reverse the selector layout and swap the high/low
+   nibbles so that the resulting vector matches big-endian semantics.  */
+
+;; Vector Uncompress Nibbles
+
+(define_int_iterator VUCMPR_N [UNSPEC_VUCMPRHN UNSPEC_VUCMPRLN])
+
+(define_insn "altivec_vucmpr<vu_hl>n_direct"
+  [(set (match_operand:V8HI 0 "altivec_register_operand" "=v")
+       (unspec:V8HI [(match_operand:V16QI 1 "altivec_register_operand" "v")
+                     (match_operand:V4SI 2 "altivec_register_operand" "v")]
+                    VUCMPR_N))]
+  "TARGET_FUTURE"
+  "vucmpr<vu_hl>n %0, %1, %2")
+
+;; Vector uncompress nibbles.
+;; For big-endian, generates:
+;;   vucmpr<vu_hl>n operands[0], operands[1], operands[2]
+;; For little-endian with VSX, generates:
+;;   vspltw splat, operands[2], <vucmpr_splat>
+;;   xxbrw splat, splat
+;;   vspltisb shift, 4
+;;   vrlb rotated, bytes, shift
+;;   vucmpr<vu_lh>n operands[0], operands[1], selector
+;; For little-endian without VSX (Altivec-only), generates:
+;;   pli mask, <vucmpr_pcv>
+;;   vinsw pcv, mask, <vucmpr_uim>
+;;   vperm operands[2], operands[2], operands[2], perm
+;;   vspltisb shift, 4
+;;   vrlb rotated, bytes, shift
+;;   vucmpr<vu_lh>n operands[0], operands[1], selector
+;;
+;; Uncompress builtins require special handling on little-endian systems 
because
+;; the selector/mask layout does not match the architectural element ordering
+;; used by the vector uncompress instructions. The selector must be byte-wise
+;; reversed and the high/low nibbles swapped (via rotation) so that the
+;; resulting vector matches big-endian semantics.
+
+(define_expand "altivec_vucmpr<vu_hl>n"
+  [(set (match_operand:V8HI 0 "altivec_register_operand")
+       (unspec:V8HI [(match_operand:V16QI 1 "altivec_register_operand")
+                     (match_operand:V4SI 2 "altivec_register_operand")]
+                    VUCMPR_N))]
+  "TARGET_FUTURE"
+{
+  if (BYTES_BIG_ENDIAN)
+    {
+      emit_insn (gen_altivec_vucmpr<vu_hl>n_direct(operands[0], operands[1],
+                                                  operands[2]));
+      DONE;
+    }
+  if (TARGET_VSX)
+    {
+      rtx splat = gen_reg_rtx (V4SImode);
+      rtx shift = gen_reg_rtx (V16QImode);
+      rtx bytes = gen_reg_rtx (V16QImode);
+      rtx rotated = gen_reg_rtx (V16QImode);
+      rtx selector = gen_reg_rtx (V4SImode);
+
+      emit_insn (gen_altivec_vspltw_direct (splat, operands[2],
+                                           GEN_INT (<vucmpr_splat>)));
+      emit_insn (gen_p9_xxbrw_v4si (splat, splat));
+      emit_move_insn (bytes, gen_lowpart (V16QImode, splat));
+      emit_insn (gen_altivec_vspltisb (shift, GEN_INT (4)));
+      emit_insn (gen_altivec_vrlb (rotated, bytes, shift));
+      emit_move_insn (selector, gen_lowpart (V4SImode, rotated));
+      emit_insn (gen_altivec_vucmpr<vu_lh>n_direct (operands[0], operands[1],
+                                                   selector));
+    }
+  else
+    {
+      rtx pcv = gen_reg_rtx (V4SImode);
+      rtx perm = gen_reg_rtx (V16QImode);
+      rtx mask = gen_reg_rtx (SImode);
+      rtx shift = gen_reg_rtx (V16QImode);
+      rtx bytes = gen_reg_rtx (V16QImode);
+      rtx rotated = gen_reg_rtx (V16QImode);
+      rtx selector = gen_reg_rtx (V4SImode);
+
+      emit_move_insn (mask, GEN_INT (<vucmpr_pcv>));
+      emit_insn (gen_vreplace_elt_v4si_inst (pcv, pcv, mask,
+                                            GEN_INT (<vucmpr_uim>)));
+      emit_move_insn (perm, gen_lowpart (V16QImode, pcv));
+      emit_insn (gen_altivec_vperm_v4si_direct (operands[2], operands[2],
+                                               operands[2], perm));
+      emit_insn (gen_altivec_vspltisb (shift, GEN_INT (4)));
+      emit_move_insn (bytes, gen_lowpart (V16QImode, operands[2]));
+      emit_insn (gen_altivec_vrlb (rotated, bytes, shift));
+      emit_move_insn (selector, gen_lowpart (V4SImode, rotated));
+      emit_insn (gen_altivec_vucmpr<vu_lh>n_direct (operands[0], operands[1],
+                                                   selector));
+    }
+
+  DONE;
+})
+
+;; Vector Uncompress Bytes
+
+(define_int_iterator VUCMPR_B [UNSPEC_VUCMPRHB UNSPEC_VUCMPRLB])
+
+(define_insn "altivec_vucmpr<vu_hl>b_direct"
+  [(set (match_operand:V4SI 0 "altivec_register_operand" "=v")
+       (unspec:V4SI [(match_operand:V8HI 1 "altivec_register_operand" "v")
+                     (match_operand:V8HI 2 "altivec_register_operand" "v")]
+                    VUCMPR_B))]
+  "TARGET_FUTURE"
+  "vucmpr<vu_hl>b %0, %1, %2"
+  [(set_attr "type" "vecperm")])
+
+;; Vector uncompress bytes.
+;; For big-endian, generates:
+;;   vucmpr<vu_hl>b operands[0], operands[1], operands[2]
+;; For little-endian with VSX, generates:
+;;   vsplth splat, operands[2], <vucmpr_splat>
+;;   xxbrh splat, splat
+;;   vspltisb shift, 4
+;;   vrlb rotated, bytes, shift
+;;   vucmpr<vu_lh>b operands[0], operands[1], selector
+;; For little-endian without VSX (Altivec-only), generates:
+;;   pli mask, <vucmpr_pcv>
+;;   vinsw pcv, mask, <vucmpr_uim>
+;;   vperm bytes, bytes, bytes, perm
+;;   vspltisb shift, 4
+;;   vrlb rotated, bytes, shift
+;;   vucmpr<vu_lh>b operands[0], operands[1], selector
+;;
+;; Below builtins require special handling on little-endian systems similar
+;; to nibbles, with selector byte-reversal and nibble swapping via rotation.
+
+(define_expand "altivec_vucmpr<vu_hl>b"
+  [(set (match_operand:V4SI 0 "altivec_register_operand")
+       (unspec:V4SI [(match_operand:V8HI 1 "altivec_register_operand")
+                     (match_operand:V8HI 2 "altivec_register_operand")]
+                    VUCMPR_B))]
+  "TARGET_FUTURE"
+{
+  if (BYTES_BIG_ENDIAN)
+    {
+      emit_insn (gen_altivec_vucmpr<vu_hl>b_direct (operands[0], operands[1],
+                                                   operands[2]));
+      DONE;
+    }
+  if (TARGET_VSX)
+    {
+      rtx splat = gen_reg_rtx (V8HImode);
+      rtx shift = gen_reg_rtx (V16QImode);
+      rtx bytes = gen_reg_rtx (V16QImode);
+      rtx rotated = gen_reg_rtx (V16QImode);
+      rtx selector = gen_reg_rtx (V8HImode);
+
+      emit_insn (gen_altivec_vsplth_direct (splat, operands[2],
+                                           GEN_INT (<vucmpr_splat>)));
+      emit_insn (gen_p9_xxbrh_v8hi (splat, splat));
+      emit_move_insn (bytes, gen_lowpart (V16QImode, splat));
+      emit_insn (gen_altivec_vspltisb (shift, GEN_INT (4)));
+      emit_insn (gen_altivec_vrlb (rotated, bytes, shift));
+      emit_move_insn (selector, gen_lowpart (V8HImode, rotated));
+      emit_insn (gen_altivec_vucmpr<vu_lh>b_direct (operands[0], operands[1],
+                                                   selector));
+    }
+  else
+    {
+      rtx pcv = gen_reg_rtx (V4SImode);
+      rtx perm = gen_reg_rtx (V16QImode);
+      rtx mask = gen_reg_rtx (SImode);
+      rtx shift = gen_reg_rtx (V16QImode);
+      rtx bytes = gen_reg_rtx (V16QImode);
+      rtx rotated = gen_reg_rtx (V16QImode);
+      rtx selector = gen_reg_rtx (V8HImode);
+
+      emit_move_insn (mask, GEN_INT (<vucmpr_pcv>));
+      emit_insn (gen_vreplace_elt_v4si_inst (pcv, pcv, mask,
+                                            GEN_INT (<vucmpr_uim>)));
+      emit_move_insn (perm, gen_lowpart (V16QImode, pcv));
+      emit_move_insn (bytes, gen_lowpart (V16QImode, operands[2]));
+      emit_insn (gen_altivec_vperm_v16qi_direct (bytes, bytes, bytes, perm));
+      emit_insn (gen_altivec_vspltisb (shift, GEN_INT (4)));
+      emit_insn (gen_altivec_vrlb (rotated, bytes, shift));
+      emit_move_insn (selector, gen_lowpart (V8HImode, rotated));
+      emit_insn (gen_altivec_vucmpr<vu_lh>b_direct (operands[0], operands[1],
+                                                   selector));
+    }
+
+  DONE;
+})
+
+;; Vector Uncompress Halfwords
+
+(define_int_iterator VUCMPR_H [UNSPEC_VUCMPRHH UNSPEC_VUCMPRLH])
+
+(define_insn "altivec_vucmpr<vu_hl>h_direct"
+  [(set (match_operand:V2DI 0 "altivec_register_operand" "=v")
+        (unspec:V2DI [(match_operand:V4SI 1 "altivec_register_operand" "v")
+                     (match_operand:V16QI 2 "altivec_register_operand" "v")]
+                    VUCMPR_H))]
+  "TARGET_FUTURE && TARGET_VSX"
+  "vucmpr<vu_hl>h %0, %1, %2"
+  [(set_attr "type" "vecperm")])
+
+;; Vector uncompress halfwords.
+;; For big-endian, generates:
+;;   vucmpr<vu_hl>h operands[0], operands[1], operands[2]
+;; For little-endian, generates:
+;;   vspltb splat, operands[2], <vucmpr_splat>
+;;   vspltisb shift, 4
+;;   vrlb rotated, splat, shift
+;;   vucmpr<vu_lh>h operands[0], operands[1], rotated
+;;
+;; TARGET_VSX is required because the builtin operates on V2DI (vector
+;; unsigned long long), which requires -mvsx.
+
+(define_expand "altivec_vucmpr<vu_hl>h"
+  [(set (match_operand:V2DI 0 "altivec_register_operand")
+        (unspec:V2DI [(match_operand:V4SI 1 "altivec_register_operand")
+                     (match_operand:V16QI 2 "altivec_register_operand")]
+                    VUCMPR_H))]
+  "TARGET_FUTURE && TARGET_VSX"
+{
+  if (BYTES_BIG_ENDIAN)
+    {
+      emit_insn (gen_altivec_vucmpr<vu_hl>h_direct (operands[0], operands[1],
+                                                   operands[2]));
+    }
+  else
+    {
+      rtx splat = gen_reg_rtx (V16QImode);
+      rtx shift = gen_reg_rtx (V16QImode);
+      rtx rotated = gen_reg_rtx (V16QImode);
+
+      emit_insn (gen_altivec_vspltb_direct (splat, operands[2],
+                                           GEN_INT (<vucmpr_splat>)));
+      emit_insn (gen_altivec_vspltisb (shift, GEN_INT (4)));
+      emit_insn (gen_altivec_vrlb (rotated, splat, shift));
+      emit_insn (gen_altivec_vucmpr<vu_lh>h_direct (operands[0], operands[1],
+                                                   rotated));
+    }
+  DONE;
+})
+
diff --git a/gcc/config/rs6000/rs6000-builtins.def 
b/gcc/config/rs6000/rs6000-builtins.def
index b5b6c98b69e..9222a76f0c4 100644
--- a/gcc/config/rs6000/rs6000-builtins.def
+++ b/gcc/config/rs6000/rs6000-builtins.def
@@ -3977,3 +3977,40 @@
 
   const vss __builtin_vsx_xvmulhsh (vss, vss);
     XVMULHSH smulv8hi3_highpart {}
+
+  const vull __builtin_altivec_uncompresshh (vui, vuc);
+    VUCMPRHH altivec_vucmprhh {}
+
+  const vull __builtin_altivec_uncompresslh (vui, vuc);
+    VUCMPRLH altivec_vucmprlh {}
+
+  const vsc __builtin_altivec_unpack_hsn_to_byte (vull);
+    VUPKHSNTOB altivec_vupkhsntob {}
+
+  const vsc __builtin_altivec_unpack_lsn_to_byte (vull);
+    VUPKLSNTOB altivec_vupklsntob {}
+
+[future-altivec]
+  const vus __builtin_altivec_uncompresshn (vuc, vui);
+    VUCMPRHN altivec_vucmprhn {}
+
+  const vui __builtin_altivec_uncompresshb (vus, vus);
+    VUCMPRHB altivec_vucmprhb {}
+
+  const vus __builtin_altivec_uncompressln (vuc, vui);
+    VUCMPRLN altivec_vucmprln {}
+
+  const vui __builtin_altivec_uncompresslb (vus, vus);
+    VUCMPRLB altivec_vucmprlb {}
+
+  const vuc __builtin_altivec_unpack_int4_to_bf16 (vus, const int<2>);
+    VUPKINT4TOBF16 altivec_vupkint4tobf16 {}
+
+  const vuc __builtin_altivec_unpack_int8_to_bf16 (vus, const int<1>);
+    VUPKINT8TOBF16 altivec_vupkint8tobf16 {}
+
+  const vf __builtin_altivec_unpack_int4_to_fp32 (vui, const int<3>);
+    VUPKINT4TOFP32 altivec_vupkint4tofp32 {}
+
+  const vf __builtin_altivec_unpack_int8_to_fp32 (vui, const int<2>);
+    VUPKINT8TOFP32 altivec_vupkint8tofp32 {}
diff --git a/gcc/config/rs6000/rs6000-overload.def 
b/gcc/config/rs6000/rs6000-overload.def
index ef7b59ed112..11cd29f45c0 100644
--- a/gcc/config/rs6000/rs6000-overload.def
+++ b/gcc/config/rs6000/rs6000-overload.def
@@ -5015,6 +5015,53 @@
   vd __builtin_vsx_xxsldwi (vd, vd, const int);
     XXSLDWI_2DF  XXSLDWI_VD2
 
+[VEC_UCMPRHN, vec_uncompresshn, __builtin_vec_uncompresshn]
+  vus __builtin_vec_uncompresshn (vuc, vui);
+    VUCMPRHN
+
+[VEC_UCMPRHB, vec_uncompresshb, __builtin_vec_uncomresshb]
+  vui __builtin_vec_uncomresshb (vus, vus);
+    VUCMPRHB
+
+[VEC_UCMPRHH, vec_uncompresshh, __builtin_vec_uncomresshh]
+  vull __builtin_vec_uncomresshh (vui, vuc);
+    VUCMPRHH
+
+[VEC_UCMPRLN, vec_uncompressln, __builtin_vec_uncomressln]
+  vus __builtin_vec_uncomressln (vuc, vui);
+    VUCMPRLN
+
+[VEC_UCMPRLB, vec_uncompresslb, __builtin_vec_uncomresslb]
+  vui __builtin_vec_uncomresslb (vus, vus);
+    VUCMPRLB
+
+[VEC_UCMPRLH, vec_uncompresslh, __builtin_vec_uncomresslh]
+  vull __builtin_vec_uncomresslh (vui, vuc);
+    VUCMPRLH
+
+[VEC_UNPACK_HSN_TO_BYTE, vec_unpack_hsn_to_byte, 
__builtin_vec_unpack_hsn_to_byte]
+  vsc __builtin_vec_unpack_hsn_to_byte (vull);
+    VUPKHSNTOB
+
+[VEC_UNPACK_LSN_TO_BYTE, vec_unpack_lsn_to_byte, 
__builtin_vec_unpack_lsn_to_byte]
+  vsc __builtin_vec_unpack_lsn_to_byte (vull);
+    VUPKLSNTOB
+
+[VEC_UNPACK_INT4_TO_BF16, vec_unpack_int4_to_bf16, 
__builtin_vec_unpack_int4_to_bf16]
+  vuc __builtin_vec_unpack_int4_to_bf16 (vus, const int<2>);
+    VUPKINT4TOBF16
+
+[VEC_UNPACK_INT8_TO_BF16, vec_unpack_int8_to_bf16, 
__builtin_vec_unpack_int8_to_bf16]
+  vuc __builtin_vec_unpack_int8_to_bf16 (vus, const int<1>);
+    VUPKINT8TOBF16
+
+[VEC_UNPACK_INT4_TO_FP32, vec_unpack_int4_to_fp32, 
__builtin_vec_unpack_int4_to_fp32]
+  vf __builtin_vec_unpack_int4_to_fp32 (vui, const int<3>);
+    VUPKINT4TOFP32
+
+[VEC_UNPACK_INT8_TO_FP32, vec_unpack_int8_to_fp32, 
__builtin_vec_unpack_int8_to_fp32]
+  vf __builtin_vec_unpack_int8_to_fp32 (vui, const int<2>);
+    VUPKINT8TOFP32
 
 ; **************************************************************************
 ; **************************************************************************
diff --git a/gcc/testsuite/gcc.target/powerpc/future-vucmpr-altivec.c 
b/gcc/testsuite/gcc.target/powerpc/future-vucmpr-altivec.c
new file mode 100644
index 00000000000..62f48cc3c67
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/future-vucmpr-altivec.c
@@ -0,0 +1,50 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mdejagnu-cpu=future -mno-vsx" } */
+/* { dg-require-effective-target powerpc_future_compile_ok } */
+
+#include <altivec.h>
+
+vector unsigned short
+test_uncompresshn (vector unsigned char a,
+                   vector unsigned int b)
+{
+  return vec_uncompresshn (a, b);
+}
+
+vector unsigned int
+test_uncompresshb (vector unsigned short a,
+                   vector unsigned short b)
+{
+  return vec_uncompresshb (a, b);
+}
+
+vector unsigned short
+test_uncompressln (vector unsigned char a,
+                   vector unsigned int b)
+{
+  return vec_uncompressln (a, b);
+}
+
+vector unsigned int
+test_uncompresslb (vector unsigned short a,
+                   vector unsigned short b)
+{
+  return vec_uncompresslb (a, b);
+}
+
+/* { dg-final { scan-assembler-not "vxor" { target { be } } } } */
+/* { dg-final { scan-assembler-not "vinsw" { target { be } } } } */
+/* { dg-final { scan-assembler-not "vperm" { target { be } } } } */
+
+
+/* { dg-final { scan-assembler-times "vxor" 4 { target { le } } } } */
+/* { dg-final { scan-assembler-times "vinsw" 4 { target { le } } } } */
+/* { dg-final { scan-assembler-times "vperm" 4 { target { le } } } } */
+/* { dg-final { scan-assembler-times "vrlb" 4 { target { le } } } } */
+/* { dg-final { scan-assembler-times "vspltisb" 4 { target { le } } } } */
+
+/* Final uncompress instructions.  */
+
+/* { dg-final { scan-assembler-times {vucmpr[lh][nb]} 4 } } */
+
diff --git a/gcc/testsuite/gcc.target/powerpc/future-vucmpr-vsx.c 
b/gcc/testsuite/gcc.target/powerpc/future-vucmpr-vsx.c
new file mode 100644
index 00000000000..b8887f2a5e6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/future-vucmpr-vsx.c
@@ -0,0 +1,61 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mdejagnu-cpu=future -mvsx" } */
+/* { dg-require-effective-target powerpc_future_compile_ok } */
+
+#include <altivec.h>
+
+vector unsigned short test_uncompresshn(vector unsigned char a,
+                                        vector unsigned int b)
+{
+  return vec_uncompresshn(a, b);
+}
+
+vector unsigned int test_uncompresshb(vector unsigned short a,
+                                      vector unsigned short b)
+{
+  return vec_uncompresshb(a, b);
+}
+
+vector unsigned long long test_uncompresshh(vector unsigned int a,
+                                            vector unsigned char b)
+{
+  return vec_uncompresshh(a, b);
+}
+
+vector unsigned short test_uncompressln(vector unsigned char a,
+                                        vector unsigned int b)
+{
+  return vec_uncompressln(a, b);
+}
+
+vector unsigned int test_uncompresslb(vector unsigned short a,
+                                      vector unsigned short b)
+{
+  return vec_uncompresslb(a, b);
+}
+
+vector unsigned long long test_uncompresslh(vector unsigned int a,
+                                            vector unsigned char b)
+{
+  return vec_uncompresslh(a, b);
+}
+
+/* BE: direct instructions, no splats or reverse. */
+
+/* { dg-final { scan-assembler-not {vsplt[whb]} { target { be } } } } */
+/* { dg-final { scan-assembler-not {xxspltib} { target { be } } } } */
+/* { dg-final { scan-assembler-not {xxbr[wh]\M} { target { be } } } } */
+/* { dg-final { scan-assembler-not {vrlb} { target { be } } } } */
+
+/* LE: splats and reverse-byte + rotate must appear. */
+
+/* { dg-final { scan-assembler-times {vsplt[whb]} 6 { target { le } } } } */
+
+/* { dg-final { scan-assembler-times "xxspltib" 6 { target { le } } } } */
+
+/* { dg-final { scan-assembler-times {xxbr[wh]} 4 { target { le } } } } */
+
+/* { dg-final { scan-assembler-times "vrlb" 6 { target { le } } } } */
+
+/* { dg-final { scan-assembler-times {vucmpr[lh][nbh]} 6 } } */
+
diff --git a/gcc/testsuite/gcc.target/powerpc/future-vupk.c 
b/gcc/testsuite/gcc.target/powerpc/future-vupk.c
new file mode 100644
index 00000000000..7c642ed5c12
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/future-vupk.c
@@ -0,0 +1,51 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mdejagnu-cpu=future" } */
+/* { dg-require-effective-target powerpc_future_compile_ok } */
+
+#include <altivec.h>
+
+vector signed char
+test_unpack_hsn_to_byte(vector unsigned long long a)
+{
+  return vec_unpack_hsn_to_byte(a);
+}
+
+vector signed char
+test_unpack_lsn_to_byte(vector unsigned long long a)
+{
+  return vec_unpack_lsn_to_byte(a);
+}
+
+vector unsigned char
+test_unpack_int4_to_bf16(vector unsigned short a)
+{
+  return vec_unpack_int4_to_bf16(a, 0);
+}
+
+vector unsigned char
+test_unpack_int8_to_bf16(vector unsigned short a)
+{
+  return vec_unpack_int8_to_bf16(a, 0);
+}
+
+vector float
+test_unpack_int4_to_fp32(vector unsigned int a)
+{
+  return vec_unpack_int4_to_fp32(a, 0);
+}
+
+vector float
+test_unpack_int8_to_fp32(vector unsigned int a)
+{
+  return vec_unpack_int8_to_fp32(a, 0);
+}
+
+
+/* { dg-final { scan-assembler-times "xxbrq" 2 { target { vsx_hw && le } }  } 
} */
+
+/* { dg-final { scan-assembler-times "vupkhsntob" 1  } } */
+/* { dg-final { scan-assembler-times "vupklsntob" 1  } } */
+/* { dg-final { scan-assembler-times "vupkint4tobf16" 1 } } */
+/* { dg-final { scan-assembler-times "vupkint8tobf16" 1 } } */
+/* { dg-final { scan-assembler-times "vupkint4tofp32" 1 } } */
+/* { dg-final { scan-assembler-times "vupkint8tofp32" 1 } } */
-- 
2.52.0

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