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[PATCH, i386] Use scalar mask for 16-byte and 32-byte vectors when possible
- From: Ilya Enkovich <enkovich dot gnu at gmail dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Thu, 26 Nov 2015 13:33:06 +0300
- Subject: [PATCH, i386] Use scalar mask for 16-byte and 32-byte vectors when possible
- Authentication-results: sourceware.org; auth=none
Hi,
This patch allows usage of scalar masks for ymm and xmm registers when target supports it. Bootstrapped and regtested on x86_64-unknown-linux-gnu. OK for trunk?
Thanks,
Ilya
--
gcc/
2015-11-26 Ilya Enkovich <enkovich.gnu@gmail.com>
* config/i386/i386.c (ix86_get_mask_mode): Use scalar
modes for 32 and 16 byte vectors when possible.
gcc/testsuite/
2015-11-26 Ilya Enkovich <enkovich.gnu@gmail.com>
* gcc.dg/vect/vect-32-chars.c: New test.
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 83749d5..d7c359f 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -53443,7 +53443,8 @@ ix86_get_mask_mode (unsigned nunits, unsigned vector_size)
unsigned elem_size = vector_size / nunits;
/* Scalar mask case. */
- if (TARGET_AVX512F && vector_size == 64)
+ if ((TARGET_AVX512F && vector_size == 64)
+ || (TARGET_AVX512VL && (vector_size == 32 || vector_size == 16)))
{
if (elem_size == 4 || elem_size == 8 || TARGET_AVX512BW)
return smallest_mode_for_size (nunits, MODE_INT);
diff --git a/gcc/testsuite/gcc.dg/vect/vect-32-chars.c b/gcc/testsuite/gcc.dg/vect/vect-32-chars.c
new file mode 100644
index 0000000..0af5d2d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-32-chars.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-mavx512bw -mavx512vl" { target { i?86-*-* x86_64-*-* } } } */
+
+char a[32];
+char b[32];
+char c[32];
+
+void test()
+{
+ int i = 0;
+ for (i = 0; i < 32; i++)
+ if (b[i] > 0)
+ a[i] = c[i];
+}
+
+/* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" { target { i?86-*-* x86_64-*-* } } } } */