[PATCH 27/41] i386: Make _mm_empty () as NOP without MMX

[H.J. Lu]

With SSE emulation of MMX intrinsics, we should make _mm_empty () as NOP
without MMX.

        PR target/89021
        * config/i386/mmx.md (mmx_<emms>): Renamed to ...
        (*mmx_<emms>): This.
        (mmx_<emms>): New expander.
---
 gcc/config/i386/mmx.md | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/gcc/config/i386/mmx.md b/gcc/config/i386/mmx.md
index f27513f7f2c..c48d42c7d59 100644
--- a/gcc/config/i386/mmx.md
+++ b/gcc/config/i386/mmx.md
@@ -1849,7 +1849,35 @@
   [(UNSPECV_EMMS "emms")
    (UNSPECV_FEMMS "femms")])
 
-(define_insn "mmx_<emms>"
+(define_expand "mmx_<emms>"
+  [(parallel
+    [(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_nop ());
+       DONE;
+     }
+})
+
+(define_insn "*mmx_<emms>"
   [(unspec_volatile [(const_int 0)] EMMS)
    (clobber (reg:XF ST0_REG))
    (clobber (reg:XF ST1_REG))
-- 
2.20.1