Extend pass rpad to handle avx512f vcvtusi2ss vcvtusi2ss 538.imagick_r improved...

Extend pass rpad to handle avx512f vcvtusi2ss vcvtusi2ss
538.imagick_r improved by 4% with single copy run on SKYLAKE workstation.

gcc/
	* config/i386/i386.md
	(*floatuns<SWI48:mode><MODEF:mode>2_avx512):
	Add avx_partial_xmm_update.

gcc/testsuie
	* gcc.target/i386/pr87007-3.c: New test.

From-SVN: r275926

gcc/ChangeLog

+2019-09-19  Hongtao Liu <hongtao.liu@intel.com>
+
+	PR target/87007
+	* config/i386.md (*floatuns<SWI48:mode><MODEF:mode>2_avx512):
+	Add avx_partial_xmm_update.
+
 2019-09-18  Jim Wilson  <jimw@sifive.com>
 
 	PR target/91683

gcc/config/i386/i386.md

@@ -5196,6 +5196,7 @@
   "TARGET_AVX512F && TARGET_SSE_MATH"
   "vcvtusi2<MODEF:ssemodesuffix><SWI48:rex64suffix>\t{%1, %0, %0|%0, %0, %1}"
   [(set_attr "type" "sseicvt")
+   (set_attr "avx_partial_xmm_update" "true")
    (set_attr "prefix" "evex")
    (set_attr "mode" "<MODEF:MODE>")])
 

gcc/testsuite/ChangeLog

+2019-09-19  Hongtao Liu <hongtao.liu@intel.com>
+
+	PR target/87007
+	* gcc.target/i386/pr87007-3.c: New test.
+
 2019-09-18  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR target/90878

gcc/testsuite/gcc.target/i386/pr87007-3.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -march=skylake-avx512 -mfpmath=sse" } */
+
+extern float f;
+extern double d;
+extern unsigned char c;
+
+void
+foo (int n, int k)
+{
+  for (int i = 0; i != n; i++)
+    if(i < k)
+      d = c;
+    else
+      f = c;
+}
+
+/* { dg-final { scan-assembler-times "vxorps\[^\n\r\]*xmm\[0-9\]" 1 } } */