7: r120:V4SI=const_vector
8: r121:V4SI=unspec[r120:V4SI,r120:V4SI,0xc] 260
with r121:v4SI = r120:V4SI when r120 is a vector with same element.
Bootstrapped and regtested pass on powerpc64le-linux-gnu {P10, P9}
and powerpc64-linux-gnu {P8, P7}. OK for master?
gcc/ChangeLog:
* config/rs6000/altivec.md (sldoi_to_mov_<mode>): New.
gcc/testsuite/ChangeLog:
* gcc.target/powerpc/sldoi_to_mov.c: New test.
---
gcc/config/rs6000/altivec.md | 11 +++++++++++
gcc/testsuite/gcc.target/powerpc/sldoi_to_mov.c | 15 +++++++++++++++
2 files changed, 26 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/powerpc/sldoi_to_mov.c
diff --git a/gcc/config/rs6000/altivec.md b/gcc/config/rs6000/altivec.md
index b2909857c34..25f86dbe828 100644
--- a/gcc/config/rs6000/altivec.md
+++ b/gcc/config/rs6000/altivec.md
@@ -383,6 +383,17 @@ (define_split
}
})
+(define_insn_and_split "sldoi_to_mov_<mode>"
+ [(set (match_operand:VM 0 "altivec_register_operand")
+ (unspec:VM [(match_operand:VM 1 "easy_vector_constant")
+ (match_dup 1)
+ (match_operand:VM 2 "u5bit_cint_operand")]
+ UNSPEC_VSLDOI))]
+ "VECTOR_UNIT_ALTIVEC_OR_VSX_P (<MODE>mode) && can_create_pseudo_p ()"
+ "#"
+ "&& 1"
+ [(set (match_dup 0) (match_dup 1))])
+
(define_insn "get_vrsave_internal"
[(set (match_operand:SI 0 "register_operand" "=r")
(unspec:SI [(reg:SI VRSAVE_REGNO)] UNSPEC_GET_VRSAVE))]
diff --git a/gcc/testsuite/gcc.target/powerpc/sldoi_to_mov.c
b/gcc/testsuite/gcc.target/powerpc/sldoi_to_mov.c
new file mode 100644
index 00000000000..2053243c456
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/sldoi_to_mov.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+#include <altivec.h>
+vector signed int foo1 (vector signed int a) {
+ vector signed int b = {0};
+ return vec_sum2s(a, b);
+}
+
+vector signed int foo2 (vector signed int a) {
+ vector signed int b = {0};
+ return vec_sld(b, b, 4);
+}
+
+/* { dg-final { scan-assembler-times {\mvsldoi\M} 1 {target le} } } */
--
2.27.0
