[gcc r12-6194] i386: Always enable mov<V_32:mode> patterns [PR103894]

[Uros Bizjak <uros@gcc.gnu.org>]

https://gcc.gnu.org/g:1096ab1775636f35de9c6661f8f71f03299af998

commit r12-6194-g1096ab1775636f35de9c6661f8f71f03299af998
Author: Uros Bizjak <ubizjak@gmail.com>
Date:   Mon Jan 3 20:58:16 2022 +0100

    i386: Always enable mov<V_32:mode> patterns [PR103894]
    
    Middle end tries to generate V4QImode moves to implement V2QImode inserts
    and calls emit_move_multi_word when V4QImode moves are unavailable, as is
    the case with 32-bit vector moves, constrainted with TARGET_SSE2.
    
    However, this triggers
    
      gcc_assert (mode_size >= UNITS_PER_WORD);
    
    in emit_move_multi_word, since mode_size of V4QImode operand is less than
    UNITS_PER_WORD of 64-bit targets.
    
    The patch unconditionally enables 32-bit vector moves to match 16-bit
    vector moves.  This also enables implementation of 32-bit vector logic
    operations with GPR in a follow-up patch.
    
    2022-01-03  Uroš Bizjak  <ubizjak@gmail.com>
    
    gcc/ChangeLog:
    
            PR target/103894
            * config/i386/mmx.md (mov<V_32:mode>): Remove TARGET_SSE2 constraint.
            (mov<V_32:mode>_internal): Ditto.
            (*push<V_32:mode>_rex64): Ditto.
            (movmisalign<V_32:mode>): Ditto.
            (*push<V_32:mode>_rex64 splitter): Enable for
            TARGET_64BIT && TARGET_SSE.
            (*push<V_32:mode>2): Remove insn pattern.
    
    gcc/testsuite/ChangeLog:
    
            PR target/103894
            * gcc.target/i386/pr103894.c: New test.

Diff:
---
 gcc/config/i386/mmx.md                   | 23 ++++++-----------------
 gcc/testsuite/gcc.target/i386/pr103894.c | 13 +++++++++++++
 2 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/gcc/config/i386/mmx.md b/gcc/config/i386/mmx.md
index 67b02661243..5b33d3cfc1c 100644
--- a/gcc/config/i386/mmx.md
+++ b/gcc/config/i386/mmx.md
@@ -250,7 +250,7 @@
 (define_expand "mov<mode>"
   [(set (match_operand:V_32 0 "nonimmediate_operand")
 	(match_operand:V_32 1 "nonimmediate_operand"))]
-  "TARGET_SSE2"
+  ""
 {
   ix86_expand_vector_move (<MODE>mode, operands);
   DONE;
@@ -261,8 +261,7 @@
     "=r ,m ,v,v,v,m,r,v")
 	(match_operand:V_32 1 "general_operand"
     "rmC,rC,C,v,m,v,v,r"))]
-  "TARGET_SSE2
-   && !(MEM_P (operands[0]) && MEM_P (operands[1]))"
+  "!(MEM_P (operands[0]) && MEM_P (operands[1]))"
 {
   switch (get_attr_type (insn))
     {
@@ -321,29 +320,19 @@
 (define_insn "*push<mode>2_rex64"
   [(set (match_operand:V_32 0 "push_operand" "=X,X")
 	(match_operand:V_32 1 "nonmemory_no_elim_operand" "rC,*v"))]
-  "TARGET_SSE2 && TARGET_64BIT"
+  "TARGET_64BIT"
   "@
    push{q}\t%q1
    #"
   [(set_attr "type" "push,multi")
    (set_attr "mode" "DI")])
 
-(define_insn "*push<mode>2"
-  [(set (match_operand:V_32 0 "push_operand" "=<,<")
-	(match_operand:V_32 1 "general_no_elim_operand" "rC*m,*v"))]
-  "TARGET_SSE2 && !TARGET_64BIT"
-  "@
-   push{l}\t%1
-   #"
-  [(set_attr "type" "push,multi")
-   (set_attr "mode" "SI")])
-
 (define_split
   [(set (match_operand:V_32 0 "push_operand")
 	(match_operand:V_32 1 "sse_reg_operand"))]
-  "TARGET_SSE2 && reload_completed"
+  "TARGET_64BIT && TARGET_SSE && reload_completed"
   [(set (reg:P SP_REG) (plus:P (reg:P SP_REG) (match_dup 2)))
-    (set (match_dup 0) (match_dup 1))]
+   (set (match_dup 0) (match_dup 1))]
 {
   operands[2] = GEN_INT (-PUSH_ROUNDING (GET_MODE_SIZE (<V_32:MODE>mode)));
   /* Preserve memory attributes. */
@@ -353,7 +342,7 @@
 (define_expand "movmisalign<mode>"
   [(set (match_operand:V_32 0 "nonimmediate_operand")
 	(match_operand:V_32 1 "nonimmediate_operand"))]
-  "TARGET_SSE2"
+  ""
 {
   ix86_expand_vector_move (<MODE>mode, operands);
   DONE;
diff --git a/gcc/testsuite/gcc.target/i386/pr103894.c b/gcc/testsuite/gcc.target/i386/pr103894.c
new file mode 100644
index 00000000000..69c81046930
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr103894.c
@@ -0,0 +1,13 @@
+/* PR target/103894 */
+/* { dg-do compile } */
+/* { dg-options "-msse -mno-sse2" } */
+
+typedef unsigned char __attribute__((__vector_size__ (32))) V;
+typedef unsigned char __attribute__((__vector_size__ (2))) W;
+
+V v;
+
+W foo (W w)
+{
+  return __builtin_shufflevector (v, w, 3, 4);
+}