[SPARC] Add -mfsmuld option

Add the -mfsmuld option to control the generation of the FsMULd
instruction.  In general, this instruction is available in architecture
version V8 and V9 CPUs with FPU.  Some CPUs of this category do not
support this instruction properly, e.g. AT697E, AT697F and UT699.  Some
CPUs of this category do not implement it in hardware, e.g. LEON3/4 with
GRFPU-lite.

gcc/
	* config/sparc/sparc.c (dump_target_flag_bits): Dump MASK_FSMULD.
	(sparc_option_override): Honour MASK_FSMULD.
	* config/sparc/sparc.h (MASK_FEATURES): Add MASK_FSMULD.
	* config/sparc/sparc.md (muldf3_extend): Use TARGET_FSMULD.
	* config/sparc/sparc.opt (mfsmuld): New option.
	* doc/invoke.texi (mfsmuld): Document option.

From-SVN: r250570

6 files changed, 48 insertions, 13 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fa34e49..f2697b1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2017-07-26  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* config/sparc/sparc.c (dump_target_flag_bits): Dump MASK_FSMULD.
+	(sparc_option_override): Honour MASK_FSMULD.
+	* config/sparc/sparc.h (MASK_FEATURES): Add MASK_FSMULD.
+	* config/sparc/sparc.md (muldf3_extend): Use TARGET_FSMULD.
+	* config/sparc/sparc.opt (mfsmuld): New option.
+	* doc/invoke.texi (mfsmuld): Document option.
+
 2017-07-26  Marek Polacek  <polacek@redhat.com>
 
 	PR middle-end/70992
diff --git a/gcc/config/sparc/sparc.c b/gcc/config/sparc/sparc.c
index 674a382..4a783d5 100644
--- a/gcc/config/sparc/sparc.c
+++ b/gcc/config/sparc/sparc.c
@@ -1304,6 +1304,8 @@ dump_target_flag_bits (const int flags)
     fprintf (stderr, "FLAT ");
   if (flags & MASK_FMAF)
     fprintf (stderr, "FMAF ");
+  if (flags & MASK_FSMULD)
+    fprintf (stderr, "FSMULD ");
   if (flags & MASK_FPU)
     fprintf (stderr, "FPU ");
   if (flags & MASK_HARD_QUAD)
@@ -1403,24 +1405,24 @@ sparc_option_override (void)
     const int disable;
     const int enable;
   } const cpu_table[] = {
-    { "v7",		MASK_ISA, 0 },
-    { "cypress",	MASK_ISA, 0 },
+    { "v7",		MASK_ISA|MASK_FSMULD, 0 },
+    { "cypress",	MASK_ISA|MASK_FSMULD, 0 },
     { "v8",		MASK_ISA, MASK_V8 },
     /* TI TMS390Z55 supersparc */
     { "supersparc",	MASK_ISA, MASK_V8 },
     { "hypersparc",	MASK_ISA, MASK_V8 },
-    { "leon",		MASK_ISA, MASK_V8|MASK_LEON },
+    { "leon",		MASK_ISA|MASK_FSMULD, MASK_V8|MASK_LEON },
     { "leon3",		MASK_ISA, MASK_V8|MASK_LEON3 },
-    { "leon3v7",	MASK_ISA, MASK_LEON3 },
-    { "sparclite",	MASK_ISA, MASK_SPARCLITE },
+    { "leon3v7",	MASK_ISA|MASK_FSMULD, MASK_LEON3 },
+    { "sparclite",	MASK_ISA|MASK_FSMULD, MASK_SPARCLITE },
     /* The Fujitsu MB86930 is the original sparclite chip, with no FPU.  */
     { "f930",		MASK_ISA|MASK_FPU, MASK_SPARCLITE },
     /* The Fujitsu MB86934 is the recent sparclite chip, with an FPU.  */
-    { "f934",		MASK_ISA, MASK_SPARCLITE },
+    { "f934",		MASK_ISA|MASK_FSMULD, MASK_SPARCLITE },
     { "sparclite86x",	MASK_ISA|MASK_FPU, MASK_SPARCLITE },
-    { "sparclet",	MASK_ISA, MASK_SPARCLET },
+    { "sparclet",	MASK_ISA|MASK_FSMULD, MASK_SPARCLET },
     /* TEMIC sparclet */
-    { "tsc701",		MASK_ISA, MASK_SPARCLET },
+    { "tsc701",		MASK_ISA|MASK_FSMULD, MASK_SPARCLET },
     { "v9",		MASK_ISA, MASK_V9 },
     /* UltraSPARC I, II, IIi */
     { "ultrasparc",	MASK_ISA,
@@ -1511,6 +1513,12 @@ sparc_option_override (void)
       target_flags |= MASK_LONG_DOUBLE_128;
     }
 
+  /* Enable the FsMULd instruction by default if not explicitly configured by
+     the user.  It may be later disabled by the CPU target flags or if
+     !TARGET_FPU.  */
+  if (!(target_flags_explicit & MASK_FSMULD))
+    target_flags |= MASK_FSMULD;
+
   /* Code model selection.  */
   sparc_cmodel = SPARC_DEFAULT_CMODEL;
 
@@ -1603,11 +1611,11 @@ sparc_option_override (void)
   if (TARGET_VIS4B)
     target_flags |= MASK_VIS4 | MASK_VIS3 | MASK_VIS2 | MASK_VIS;
 
-  /* Don't allow -mvis, -mvis2, -mvis3, -mvis4, -mvis4b and -mfmaf if
+  /* Don't allow -mvis, -mvis2, -mvis3, -mvis4, -mvis4b, -mfmaf and -mfsmuld if
      FPU is disabled.  */
   if (! TARGET_FPU)
     target_flags &= ~(MASK_VIS | MASK_VIS2 | MASK_VIS3 | MASK_VIS4
-		      | MASK_VIS4B | MASK_FMAF);
+		      | MASK_VIS4B | MASK_FMAF | MASK_FSMULD);
 
   /* -mvis assumes UltraSPARC+, so we are sure v9 instructions
      are available; -m64 also implies v9.  */
@@ -1641,6 +1649,10 @@ sparc_option_override (void)
   if (sparc_fix_ut699 || sparc_fix_ut700 || sparc_fix_gr712rc)
     sparc_fix_b2bst = 1;
 
+  /* Disable FsMULd for the UT699 since it doesn't work correctly.  */
+  if (sparc_fix_ut699)
+    target_flags &= ~MASK_FSMULD;
+
   /* Supply a default value for align_functions.  */
   if (align_functions == 0)
     {
diff --git a/gcc/config/sparc/sparc.h b/gcc/config/sparc/sparc.h
index d7c617e..15a6217 100644
--- a/gcc/config/sparc/sparc.h
+++ b/gcc/config/sparc/sparc.h
@@ -438,7 +438,8 @@ extern enum cmodel sparc_cmodel;
 /* Mask of all CPU feature flags.  */
 #define MASK_FEATURES						\
   (MASK_FPU + MASK_HARD_QUAD + MASK_VIS + MASK_VIS2 + MASK_VIS3	\
-   + MASK_VIS4 + MASK_CBCOND + MASK_FMAF + MASK_POPC + MASK_SUBXC)
+   + MASK_VIS4 + MASK_CBCOND + MASK_FMAF + MASK_FSMULD		\
+   + MASK_POPC + MASK_SUBXC)
  
 /* TARGET_HARD_MUL: Use 32-bit hardware multiply instructions but not %y.  */
 #define TARGET_HARD_MUL				\
diff --git a/gcc/config/sparc/sparc.md b/gcc/config/sparc/sparc.md
index b154003..751bacd 100644
--- a/gcc/config/sparc/sparc.md
+++ b/gcc/config/sparc/sparc.md
@@ -6121,7 +6121,7 @@ visl")
   [(set (match_operand:DF 0 "register_operand" "=e")
 	(mult:DF (float_extend:DF (match_operand:SF 1 "register_operand" "f"))
 		 (float_extend:DF (match_operand:SF 2 "register_operand" "f"))))]
-  "(TARGET_V8 || TARGET_V9) && TARGET_FPU && !sparc_fix_ut699"
+  "TARGET_FSMULD"
   "fsmuld\t%1, %2, %0"
   [(set_attr "type" "fpmul")
    (set_attr "fptype" "double")])
diff --git a/gcc/config/sparc/sparc.opt b/gcc/config/sparc/sparc.opt
index ae63d20..22267f5 100644
--- a/gcc/config/sparc/sparc.opt
+++ b/gcc/config/sparc/sparc.opt
@@ -93,6 +93,10 @@ mfmaf
 Target Report Mask(FMAF)
 Use UltraSPARC Fused Multiply-Add extensions.
 
+mfsmuld
+Target Report Mask(FSMULD)
+Use Floating-point Multiply Single to Double (FsMULd) instruction.
+
 mpopc
 Target Report Mask(POPC)
 Use UltraSPARC Population-Count instruction.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index a6da37c..6e174c5 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -1124,7 +1124,7 @@ See RS/6000 and PowerPC Options.
 -mv8plus  -mno-v8plus  -mvis  -mno-vis @gol
 -mvis2  -mno-vis2  -mvis3  -mno-vis3 @gol
 -mvis4 -mno-vis4 -mvis4b -mno-vis4b @gol
--mcbcond  -mno-cbcond  -mfmaf  -mno-fmaf  @gol
+-mcbcond  -mno-cbcond  -mfmaf  -mno-fmaf  -mfsmuld  -mno-fsmuld  @gol
 -mpopc  -mno-popc  -msubxc  -mno-subxc @gol
 -mfix-at697f  -mfix-ut699  -mfix-ut700  -mfix-gr712rc @gol
 -mlra  -mno-lra}
@@ -24069,6 +24069,15 @@ Fused Multiply-Add Floating-point instructions.  The default is @option{-mfmaf}
 when targeting a CPU that supports such instructions, such as Niagara-3 and
 later.
 
+@item -mfsmuld
+@itemx -mno-fsmuld
+@opindex mfsmuld
+@opindex mno-fsmuld
+With @option{-mfsmuld}, GCC generates code that takes advantage of the
+Floating-point Multiply Single to Double (FsMULd) instruction.  The default is
+@option{-mfsmuld} when targeting a CPU supporting the architecture versions V8
+or V9 with FPU except @option{-mcpu=leon}.
+
 @item -mpopc
 @itemx -mno-popc
 @opindex mpopc