A vec_cmpge produces a negation. Replace this negation by swapping the two
selection choices of a vec_sel based on the result of the vec_cmpge.
Bootstrapped and regression tested on s390x.
gcc/ChangeLog:
* config/s390/vx-builtins.md: New vsel pattern.
gcc/testsuite/ChangeLog:
* gcc.target/s390/vector/vec-cmpge.c: New test.
Signed-off-by: Juergen Christ <jchr...@linux.ibm.com>
---
gcc/config/s390/vx-builtins.md | 11 +++++++++++
.../gcc.target/s390/vector/vec-cmpge.c | 18 ++++++++++++++++++
2 files changed, 29 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/s390/vector/vec-cmpge.c
diff --git a/gcc/config/s390/vx-builtins.md b/gcc/config/s390/vx-builtins.md
index f4248c55d4ec..0ce3ff6ef4a6 100644
--- a/gcc/config/s390/vx-builtins.md
+++ b/gcc/config/s390/vx-builtins.md
@@ -530,6 +530,17 @@
"vsel\t%v0,%1,%2,%3"
[(set_attr "op_type" "VRR")])
+(define_insn "vsel<mode>_swapped"
+ [(set (match_operand:V_HW_FT 0 "register_operand" "=v")
+ (ior:V_HW_FT
+ (and:V_HW_FT (not:V_HW_FT (match_operand:V_HW_FT 3 "register_operand"
"v"))
+ (match_operand:V_HW_FT 1 "register_operand" "v"))
+ (and:V_HW_FT (match_dup 3)
+ (match_operand:V_HW_FT 2 "register_operand" "v"))))]
+ "TARGET_VX"
+ "vsel\t%v0,%2,%1,%3"
+ [(set_attr "op_type" "VRR")])
+
; Vector sign extend to doubleword
diff --git a/gcc/testsuite/gcc.target/s390/vector/vec-cmpge.c
b/gcc/testsuite/gcc.target/s390/vector/vec-cmpge.c
new file mode 100644
index 000000000000..eb188690ae41
--- /dev/null
+++ b/gcc/testsuite/gcc.target/s390/vector/vec-cmpge.c
@@ -0,0 +1,18 @@
+/* Check that vec_sel absorbs a negation generated by vec_cmpge. */
+
+/* { dg-do compile } */
+/* { dg-options "-O3 -mzarch -march=z13" } */
+
+typedef __attribute__((vector_size(16))) unsigned char uv16qi;
+
+#include <vecintrin.h>
+
+void f(char *res, uv16qi ctrl)
+{
+ uv16qi a = vec_splat_u8(0xfe);
+ uv16qi b = vec_splat_u8(0x80);
+ uv16qi mask = vec_cmpge(ctrl, b);
+ *(uv16qi *)res = vec_sel(a, b, mask);
+}
+
+/* { dg-final { scan-assembler-not "vno\t" } } */
--
2.39.3
