[PATCH 01/41] i386: Allow MMX register modes in SSE registers

[H.J. Lu]

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.
---
 gcc/config/i386/i386-c.c | 2 ++
 gcc/config/i386/i386.c   | 5 +++--
 gcc/config/i386/i386.h   | 2 ++
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/gcc/config/i386/i386-c.c b/gcc/config/i386/i386-c.c
index 5e7e46fcebe..213e1b56c6b 100644
--- a/gcc/config/i386/i386-c.c
+++ b/gcc/config/i386/i386-c.c
@@ -548,6 +548,8 @@ ix86_target_macros_internal (HOST_WIDE_INT isa_flag,
     def_or_undef (parse_in, "__CLDEMOTE__");
   if (isa_flag2 & OPTION_MASK_ISA_PTWRITE)
     def_or_undef (parse_in, "__PTWRITE__");
+  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 0df792a41d1..eb642165264 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -40503,7 +40503,8 @@ 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);
     }
 
@@ -44329,7 +44330,7 @@ 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 4fd8bc40a34..91b233022c2 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -201,6 +201,8 @@ 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"
-- 
2.20.1