Support TImode CONST_WIDE_INT store in 64-bit STV

Support TImode CONST_WIDE_INT store generated from piecewise store.
Need to verify performance impact before enabling TImode CONST_INT
store for __int128.

gcc/

	* config/i386/i386.c (timode_scalar_to_vector_candidate_p): Allow
	TImode CONST_WIDE_INT store.
	(timode_scalar_chain::convert_insn): Handle CONST_WIDE_INT store.

gcc/testsuite/

	* gcc.target/i386/pieces-strcpy-1.c: New test.
	* gcc.target/i386/pieces-strcpy-2.c: Likewise.

From-SVN: r239383

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9ed3a74ef8121d60e3885aaaf87834a29c094143..97c99c77d12349b022d59538addd63de85badbdc 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-08-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+       * config/i386/i386.c (timode_scalar_to_vector_candidate_p): Allow
+       TImode CONST_WIDE_INT store.
+       (timode_scalar_chain::convert_insn): Handle CONST_WIDE_INT store.
+
 2015-08-11  H.J. Lu  <hongjiu.lu@intel.com>
 
        * config/i386/i386.h (MOVE_MAX_PIECES): Use TImode in 64-bit

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 93eaab10b91fe36b05226af01133d328655c652e..d086edea8142d3953ad0b11f73861943b38e690a 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -2862,9 +2862,12 @@ timode_scalar_to_vector_candidate_p (rtx_insn *insn)
 
   if (MEM_P (dst))
     {
-      /* Check for store.  Only support store from register or standard
-        SSE constants.  Memory must be aligned or unaligned store is
-        optimal.  */
+      /* Check for store.  Memory must be aligned or unaligned store
+        is optimal.  Only support store from register, standard SSE
+        constant or CONST_WIDE_INT generated from piecewise store.
+
+        ??? Verify performance impact before enabling CONST_INT for
+        __int128 store.  */
       if (misaligned_operand (dst, TImode)
          && !TARGET_SSE_UNALIGNED_STORE_OPTIMAL)
        return false;
@@ -2875,6 +2878,7 @@ timode_scalar_to_vector_candidate_p (rtx_insn *insn)
          return false;
 
        case REG:
+       case CONST_WIDE_INT:
          return true;
 
        case CONST_INT:
@@ -3868,6 +3872,19 @@ timode_scalar_chain::convert_insn (rtx_insn *insn)
       PUT_MODE (src, V1TImode);
       break;
 
+    case CONST_WIDE_INT:
+      if (NONDEBUG_INSN_P (insn))
+       {
+         /* Since there are no instructions to store 128-bit constant,
+            temporary register usage is required.  */
+         rtx tmp = gen_reg_rtx (V1TImode);
+         src = gen_rtx_CONST_VECTOR (V1TImode, gen_rtvec (1, src));
+         src = validize_mem (force_const_mem (V1TImode, src));
+         emit_conversion_insns (gen_rtx_SET (dst, tmp), insn);
+         dst = tmp;
+       }
+      break;
+
     case CONST_INT:
       switch (standard_sse_constant_p (src, TImode))
        {

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index bb47f76359eb8ff4d8052770e16212e802e4701d..f33636aadd11aa6bee725e1416a6b64edabb827e 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-08-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+       * gcc.target/i386/pieces-strcpy-1.c: New test.
+       * gcc.target/i386/pieces-strcpy-2.c: Likewise.
+
 2016-08-11  Jakub Jelinek  <jakub@redhat.com>
 
        PR c++/72868

diff --git a/gcc/testsuite/gcc.target/i386/pieces-strcpy-1.c b/gcc/testsuite/gcc.target/i386/pieces-strcpy-1.c
new file mode 100644 (file)
index 0000000..64b7329
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pieces-strcpy-1.c
@@ -0,0 +1,15 @@
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-O2 -mno-avx -msse2 -mtune=generic" } */
+
+extern char *strcpy (char *, const char *);
+
+void
+foo (char *s)
+{
+  strcpy (s,
+         "1234567890abcdef123456abcdef5678123456abcdef567abcdef678"
+         "1234567");
+}
+
+/* { dg-final { scan-assembler-times "movdqa\[ \\t\]+\[^\n\]*%xmm" 4 } } */
+/* { dg-final { scan-assembler-times "movups\[ \\t\]+\[^\n\]*%xmm" 4 } } */

diff --git a/gcc/testsuite/gcc.target/i386/pieces-strcpy-2.c b/gcc/testsuite/gcc.target/i386/pieces-strcpy-2.c
new file mode 100644 (file)
index 0000000..7421255
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pieces-strcpy-2.c
@@ -0,0 +1,15 @@
+/* { dg-do compile { target { ! ia32 } } } */
+/* { dg-options "-O2 -mno-avx2 -mavx -mtune=sandybridge" } */
+
+extern char *strcpy (char *, const char *);
+
+void
+foo (char *s)
+{
+  strcpy (s,
+         "1234567890abcdef123456abcdef5678123456abcdef567abcdef678"
+         "1234567");
+}
+
+/* { dg-final { scan-assembler-times "vmovdqa\[ \\t\]+\[^\n\]*%xmm" 4 } } */
+/* { dg-final { scan-assembler-times "vmovups\[ \\t\]+\[^\n\]*%xmm" 4 } } */