From db432672dc50ed86dda17ac821b7eb07411a90af Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Fri, 15 Sep 2017 14:11:45 -0700
Subject: tcg: Add generic vector expanders
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Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 configure | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

(limited to 'configure')

diff --git a/configure b/configure
index 831ebf248f..00695c7ea7 100755
--- a/configure
+++ b/configure
@@ -5000,6 +5000,50 @@ if compile_prog "" "" ; then
   atomic64=yes
 fi
 
+########################################
+# See if 16-byte vector operations are supported.
+# Even without a vector unit the compiler may expand these.
+# There is a bug in old GCC for PPC that crashes here.
+# Unfortunately it's the system compiler for Centos 7.
+
+cat > $TMPC << EOF
+typedef unsigned char U1 __attribute__((vector_size(16)));
+typedef unsigned short U2 __attribute__((vector_size(16)));
+typedef unsigned int U4 __attribute__((vector_size(16)));
+typedef unsigned long long U8 __attribute__((vector_size(16)));
+typedef signed char S1 __attribute__((vector_size(16)));
+typedef signed short S2 __attribute__((vector_size(16)));
+typedef signed int S4 __attribute__((vector_size(16)));
+typedef signed long long S8 __attribute__((vector_size(16)));
+static U1 a1, b1;
+static U2 a2, b2;
+static U4 a4, b4;
+static U8 a8, b8;
+static S1 c1;
+static S2 c2;
+static S4 c4;
+static S8 c8;
+static int i;
+int main(void)
+{
+  a1 += b1; a2 += b2; a4 += b4; a8 += b8;
+  a1 -= b1; a2 -= b2; a4 -= b4; a8 -= b8;
+  a1 *= b1; a2 *= b2; a4 *= b4; a8 *= b8;
+  a1 &= b1; a2 &= b2; a4 &= b4; a8 &= b8;
+  a1 |= b1; a2 |= b2; a4 |= b4; a8 |= b8;
+  a1 ^= b1; a2 ^= b2; a4 ^= b4; a8 ^= b8;
+  a1 <<= i; a2 <<= i; a4 <<= i; a8 <<= i;
+  a1 >>= i; a2 >>= i; a4 >>= i; a8 >>= i;
+  c1 >>= i; c2 >>= i; c4 >>= i; c8 >>= i;
+  return 0;
+}
+EOF
+
+vector16=no
+if compile_prog "" "" ; then
+  vector16=yes
+fi
+
 ########################################
 # check if getauxval is available.
 
@@ -6329,6 +6373,10 @@ if test "$atomic64" = "yes" ; then
   echo "CONFIG_ATOMIC64=y" >> $config_host_mak
 fi
 
+if test "$vector16" = "yes" ; then
+  echo "CONFIG_VECTOR16=y" >> $config_host_mak
+fi
+
 if test "$getauxval" = "yes" ; then
   echo "CONFIG_GETAUXVAL=y" >> $config_host_mak
 fi
-- 
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