[PATCH 27/42] i386: Make _mm_empty () as NOP when MMX is disabled

[H.J. Lu]

With SSE emulation of MMX intrinsics, we should make _mm_empty () as NOP
when MMX is disabled.

        PR target/89021
        * config/i386/mmx.md (mmx_<emms>): Renamed to ...
        (mmx_<emms>_1): This.
        (mmx_<emms>): New expander.
---
 gcc/config/i386/mmx.md | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/gcc/config/i386/mmx.md b/gcc/config/i386/mmx.md
index 9cf0251293a..0f925c0b1ea 100644
--- a/gcc/config/i386/mmx.md
+++ b/gcc/config/i386/mmx.md
@@ -1848,7 +1848,34 @@
   [(UNSPECV_EMMS "emms")
    (UNSPECV_FEMMS "femms")])
 
-(define_insn "mmx_<emms>"
+(define_expand "mmx_<emms>"
+  [(unspec_volatile [(const_int 0)] EMMS)
+   (clobber (reg:XF ST0_REG))
+   (clobber (reg:XF ST1_REG))
+   (clobber (reg:XF ST2_REG))
+   (clobber (reg:XF ST3_REG))
+   (clobber (reg:XF ST4_REG))
+   (clobber (reg:XF ST5_REG))
+   (clobber (reg:XF ST6_REG))
+   (clobber (reg:XF ST7_REG))
+   (clobber (reg:DI MM0_REG))
+   (clobber (reg:DI MM1_REG))
+   (clobber (reg:DI MM2_REG))
+   (clobber (reg:DI MM3_REG))
+   (clobber (reg:DI MM4_REG))
+   (clobber (reg:DI MM5_REG))
+   (clobber (reg:DI MM6_REG))
+   (clobber (reg:DI MM7_REG))]
+  "TARGET_MMX || TARGET_MMX_WITH_SSE"
+{
+   if (TARGET_MMX)
+     emit_insn (gen_mmx_<emms>_1 ());
+   else
+     emit_insn (gen_nop ());
+   DONE;
+})
+
+(define_insn "mmx_<emms>_1"
   [(unspec_volatile [(const_int 0)] EMMS)
    (clobber (reg:XF ST0_REG))
    (clobber (reg:XF ST1_REG))
-- 
2.20.1