invoke.texi (MIPS Options): Document -mfused-madd.

	* doc/invoke.texi (MIPS Options): Document -mfused-madd.
	* config/mips/mips.h (MASK_NO_FUSED_MADD): New.
	(TARGET_FUSED_MADD): New.
	(TARGET_SWITCHES): Add -mfused-madd, -mno-fused-madd.
	* config/mips/mips.md: Add TARGET_FUSED_MADD as condition to
	the multiply-add instructions.

From-SVN: r45041

4 files changed, 39 insertions, 9 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 666bfde..54b09bcc 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2001-08-19  Geoffrey Keating  <geoffk@redhat.com>
+
+	* doc/invoke.texi (MIPS Options): Document -mfused-madd.
+	* config/mips/mips.h (MASK_NO_FUSED_MADD): New.
+	(TARGET_FUSED_MADD): New.
+	(TARGET_SWITCHES): Add -mfused-madd, -mno-fused-madd.
+	* config/mips/mips.md: Add TARGET_FUSED_MADD as condition to
+	the multiply-add instructions.
+
 2001-08-19  Richard Henderson  <rth@redhat.com>
 
 	* dwarf2asm.c (dw2_output_indirect_constant_1): The symbol ref 
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index e09fb12..e5a3e17 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -223,6 +223,8 @@ extern void		sbss_section PARAMS ((void));
 #define MASK_UNINIT_CONST_IN_RODATA \
 			   0x00800000	/* Store uninitialized
 					   consts in rodata */
+#define MASK_NO_FUSED_MADD 0x01000000   /* Don't generate floating point
+					   multiply-add operations.  */
 
 					/* Debug switches, not documented */
 #define MASK_DEBUG	0		/* unused */
@@ -311,6 +313,8 @@ extern void		sbss_section PARAMS ((void));
 
 #define TARGET_MAD		(target_flags & MASK_MAD)
 
+#define TARGET_FUSED_MADD	(! (target_flags & MASK_NO_FUSED_MADD))
+
 #define TARGET_4300_MUL_FIX     (target_flags & MASK_4300_MUL_FIX)
 
 #define TARGET_NO_CHECK_ZERO_DIV (target_flags & MASK_NO_CHECK_ZERO_DIV)
@@ -439,6 +443,10 @@ extern void		sbss_section PARAMS ((void));
      N_("Use multiply accumulate")},					\
   {"no-mad",		 -MASK_MAD,					\
      N_("Don't use multiply accumulate")},				\
+  {"no-fused-madd",       MASK_NO_FUSED_MADD,                           \
+     N_("Don't generate fused multiply/add instructions")},		\
+  {"fused-madd",         -MASK_NO_FUSED_MADD,                           \
+     N_("Generate fused multiply/add instructions")},			\
   {"fix4300",             MASK_4300_MUL_FIX,				\
      N_("Work around early 4300 hardware bug")},			\
   {"no-fix4300",         -MASK_4300_MUL_FIX,				\
diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md
index e0d1269..8462162 100644
--- a/gcc/config/mips/mips.md
+++ b/gcc/config/mips/mips.md
@@ -2138,7 +2138,7 @@
 	(plus:DF (mult:DF (match_operand:DF 1 "register_operand" "f")
 			  (match_operand:DF 2 "register_operand" "f"))
 		 (match_operand:DF 3 "register_operand" "f")))]
-  "ISA_HAS_FP4 && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT"
+  "ISA_HAS_FP4 && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT && TARGET_FUSED_MADD"
   "madd.d\\t%0,%3,%1,%2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"DF")])
@@ -2148,7 +2148,7 @@
 	(plus:SF (mult:SF (match_operand:SF 1 "register_operand" "f")
 			  (match_operand:SF 2 "register_operand" "f"))
 		 (match_operand:SF 3 "register_operand" "f")))]
-  "ISA_HAS_FP4 && TARGET_HARD_FLOAT"
+  "ISA_HAS_FP4 && TARGET_HARD_FLOAT && TARGET_FUSED_MADD"
   "madd.s\\t%0,%3,%1,%2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"SF")])
@@ -2158,7 +2158,7 @@
 	(minus:DF (mult:DF (match_operand:DF 1 "register_operand" "f")
 			   (match_operand:DF 2 "register_operand" "f"))
 		  (match_operand:DF 3 "register_operand" "f")))]
-  "ISA_HAS_FP4 && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT"
+  "ISA_HAS_FP4 && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT && TARGET_FUSED_MADD"
   "msub.d\\t%0,%3,%1,%2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"DF")])
@@ -2169,7 +2169,7 @@
 			   (match_operand:SF 2 "register_operand" "f"))
 		  (match_operand:SF 3 "register_operand" "f")))]
 
-  "ISA_HAS_FP4 && TARGET_HARD_FLOAT"
+  "ISA_HAS_FP4 && TARGET_HARD_FLOAT && TARGET_FUSED_MADD"
   "msub.s\\t%0,%3,%1,%2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"SF")])
@@ -2179,7 +2179,7 @@
 	(neg:DF (plus:DF (mult:DF (match_operand:DF 1 "register_operand" "f")
 				  (match_operand:DF 2 "register_operand" "f"))
 			 (match_operand:DF 3 "register_operand" "f"))))]
-  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT"
+  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT && TARGET_FUSED_MADD"
   "nmadd.d\\t%0,%3,%1,%2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"DF")])
@@ -2189,7 +2189,7 @@
 	(neg:SF (plus:SF (mult:SF (match_operand:SF 1 "register_operand" "f")
 				  (match_operand:SF 2 "register_operand" "f"))
 			 (match_operand:SF 3 "register_operand" "f"))))]
-  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT"
+  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT && TARGET_FUSED_MADD"
   "nmadd.s\\t%0,%3,%1,%2"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"SF")])
@@ -2199,7 +2199,7 @@
 	(minus:DF (match_operand:DF 1 "register_operand" "f")
 		  (mult:DF (match_operand:DF 2 "register_operand" "f")
 			   (match_operand:DF 3 "register_operand" "f"))))]
-  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT"
+  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT && TARGET_DOUBLE_FLOAT && TARGET_FUSED_MADD"
   "nmsub.d\\t%0,%1,%2,%3"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"DF")])
@@ -2209,7 +2209,7 @@
 	(minus:SF (match_operand:SF 1 "register_operand" "f")
 		  (mult:SF (match_operand:SF 2 "register_operand" "f")
 			   (match_operand:SF 3 "register_operand" "f"))))]
-  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT"
+  "ISA_HAS_NMADD_NMSUB && TARGET_HARD_FLOAT && TARGET_FUSED_MADD"
   "nmsub.s\\t%0,%1,%2,%3"
   [(set_attr "type"	"fmadd")
    (set_attr "mode"	"SF")])
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 67c25c0..c0e69e6 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -450,7 +450,8 @@ in the following sections.
 @gccoptlist{
 -mabicalls -march=@var{cpu-type} -mtune=@var{cpu=type} @gol
 -mcpu=@var{cpu-type} -membedded-data  -muninit-const-in-rodata @gol
--membedded-pic  -mfp32  -mfp64  -mgas  -mgp32  -mgp64 @gol
+-membedded-pic  -mfp32  -mfp64  -mfused-madd  -mno-fused-madd @gol
+-mgas  -mgp32  -mgp64 @gol
 -mgpopt  -mhalf-pic  -mhard-float  -mint64  -mips1 @gol
 -mips2  -mips3  -mips4  -mlong64  -mlong32  -mlong-calls  -mmemcpy @gol
 -mmips-as  -mmips-tfile  -mno-abicalls @gol
@@ -7080,6 +7081,18 @@ the default.
 Assume that 32 64-bit floating point registers are available.  This is
 the default when the @option{-mips3} option is used.
 
+@item -mfused-madd
+@itemx -mno-fused-madd
+@opindex mfused-madd
+@opindex mno-fused-madd
+Generate code that uses (does not use) the floating point multiply and
+accumulate instructions, when they are available.  These instructions
+are generated by default if they are available, but this may be
+undesirable if the extra precision causes problems or on certain chips
+in the mode where denormals are rounded to zero where denormals
+generated by multiply and accumulate instructions cause exceptions
+anyway.
+
 @item -mgp32
 @opindex mgp32
 Assume that 32 32-bit general purpose registers are available.  This is