i386: Allow MMX register modes in SSE registers

In 64-bit mode, SSE2 can be used to emulate MMX instructions without
3DNOW.  We can use SSE2 to support MMX register modes.

	PR target/89021
	* config/i386/i386-c.c (ix86_target_macros_internal): Define
	__MMX_WITH_SSE__ for TARGET_MMX_WITH_SSE.
	* config/i386/i386.c (ix86_set_reg_reg_cost): Add support for
	TARGET_MMX_WITH_SSE with VALID_MMX_REG_MODE.
	(ix86_vector_mode_supported_p): Likewise.
	* config/i386/i386.h (TARGET_MMX_WITH_SSE): New.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@271213 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f05bd98f39a675ae90d12b355d0919b7d018b7b3..eb67d11d285bb2777b53b72fc121d6df9302f8a0 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,13 @@
+2019-05-15  H.J. Lu  <hongjiu.lu@intel.com>
+
+       PR target/89021
+       * config/i386/i386-c.c (ix86_target_macros_internal): Define
+       __MMX_WITH_SSE__ for TARGET_MMX_WITH_SSE.
+       * config/i386/i386.c (ix86_set_reg_reg_cost): Add support for
+       TARGET_MMX_WITH_SSE with VALID_MMX_REG_MODE.
+       (ix86_vector_mode_supported_p): Likewise.
+       * config/i386/i386.h (TARGET_MMX_WITH_SSE): New.
+
 2019-05-15  Martin Liska  <mliska@suse.cz>
 
        PR middle-end/90478

diff --git a/gcc/config/i386/i386-c.c b/gcc/config/i386/i386-c.c
index 92bf066c0792c7201aa715e653c5eade35b2b133..b968bd1593eb8de544276fe92a5785dd2661e9a5 100644 (file)
--- a/gcc/config/i386/i386-c.c
+++ b/gcc/config/i386/i386-c.c
@@ -550,6 +550,8 @@ ix86_target_macros_internal (HOST_WIDE_INT isa_flag,
     def_or_undef (parse_in, "__PTWRITE__");
   if (isa_flag2 & OPTION_MASK_ISA_AVX512BF16)
     def_or_undef (parse_in, "__AVX512BF16__");
+  if (TARGET_MMX_WITH_SSE)
+    def_or_undef (parse_in, "__MMX_WITH_SSE__");
   if (TARGET_IAMCU)
     {
       def_or_undef (parse_in, "__iamcu");

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index cc0ae3fcfd3272bd95c4f1a7432f6bff5b76542d..4f0f5bcd1bdc95ea47b2eded2565184a48bd7711 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -18882,7 +18882,8 @@ ix86_set_reg_reg_cost (machine_mode mode)
          || (TARGET_AVX && VALID_AVX256_REG_MODE (mode))
          || (TARGET_SSE2 && VALID_SSE2_REG_MODE (mode))
          || (TARGET_SSE && VALID_SSE_REG_MODE (mode))
-         || (TARGET_MMX && VALID_MMX_REG_MODE (mode)))
+         || ((TARGET_MMX || TARGET_MMX_WITH_SSE)
+             && VALID_MMX_REG_MODE (mode)))
        units = GET_MODE_SIZE (mode);
     }
 
@@ -20611,7 +20612,7 @@ ix86_vector_mode_supported_p (machine_mode mode)
     return true;
   if (TARGET_AVX512F && VALID_AVX512F_REG_MODE (mode))
     return true;
-  if (TARGET_MMX && VALID_MMX_REG_MODE (mode))
+  if ((TARGET_MMX || TARGET_MMX_WITH_SSE) && VALID_MMX_REG_MODE (mode))
     return true;
   if (TARGET_3DNOW && VALID_MMX_REG_MODE_3DNOW (mode))
     return true;

diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 3fee779296f207382e61b18c70753b4675968180..be1480fdcf87dc03c2f5d035856fc44af7410f52 100644 (file)
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -203,6 +203,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #define TARGET_16BIT   TARGET_CODE16
 #define TARGET_16BIT_P(x)      TARGET_CODE16_P(x)
 
+#define TARGET_MMX_WITH_SSE    (TARGET_64BIT && TARGET_SSE2)
+
 #include "config/vxworks-dummy.h"
 
 #include "config/i386/i386-opts.h"