[gcc r13-2844] rs6000: Fix condition of define_expand vec_shr_<mode> [PR100645]

[gcc r13-2844] rs6000: Fix condition of define_expand vec_shr_<mode> [PR100645]

[Kewen Lin]

https://gcc.gnu.org/g:bfad7069b74c97000b698191c1945f07a6192db5

commit r13-2844-gbfad7069b74c97000b698191c1945f07a6192db5
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Sun Sep 25 22:01:50 2022 -0500

    rs6000: Fix condition of define_expand vec_shr_<mode> [PR100645]
    
    PR100645 exposes one latent bug in define_expand vec_shr_<mode>
    that the current condition TARGET_ALTIVEC is too loose.  The
    mode iterator VEC_L contains a few modes, they are not always
    supported as vector mode, VECTOR_UNIT_ALTIVEC_OR_VSX_P should
    be used like some other VEC_L usages.
    
            PR target/100645
    
    gcc/ChangeLog:
    
            * config/rs6000/vector.md (vec_shr_<mode>): Replace condition
            TARGET_ALTIVEC with VECTOR_UNIT_ALTIVEC_OR_VSX_P.
    
    gcc/testsuite/ChangeLog:
    
            * gcc.target/powerpc/pr100645.c: New test.

Diff:
---
 gcc/config/rs6000/vector.md                 |  2 +-
 gcc/testsuite/gcc.target/powerpc/pr100645.c | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/gcc/config/rs6000/vector.md b/gcc/config/rs6000/vector.md
index a0d33d2f604..0171705803c 100644
--- a/gcc/config/rs6000/vector.md
+++ b/gcc/config/rs6000/vector.md
@@ -1475,7 +1475,7 @@
   [(match_operand:VEC_L 0 "vlogical_operand")
    (match_operand:VEC_L 1 "vlogical_operand")
    (match_operand:QI 2 "reg_or_short_operand")]
-  "TARGET_ALTIVEC"
+  "VECTOR_UNIT_ALTIVEC_OR_VSX_P (<MODE>mode)"
 {
   rtx bitshift = operands[2];
   rtx shift;
diff --git a/gcc/testsuite/gcc.target/powerpc/pr100645.c b/gcc/testsuite/gcc.target/powerpc/pr100645.c
new file mode 100644
index 00000000000..c4e92cc8052
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr100645.c
@@ -0,0 +1,13 @@
+/* { dg-require-effective-target powerpc_altivec_ok } */
+/* { dg-options "-mdejagnu-cpu=power6 -maltivec" } */
+
+/* This used to ICE.  */
+
+typedef long long v2di __attribute__ ((vector_size (16)));
+
+v2di
+foo_v2di_l (v2di x)
+{
+  return __builtin_shuffle ((v2di){0, 0}, x, (v2di){3, 0});
+}
+