(MASK_NO_FPR, TARGET_NO_FPR): Define.

(TARGET_SWITCHES): Add "fp-regs" and "no-fp-regs".
(CONDITIONAL_REGISTER_USAGE): Set FPRs fixed and call_used if TARGET_NO_FPR.

From-SVN: r8635

diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index 7931969..c58cf41 100644 (file)
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -137,6 +137,9 @@ extern int target_flags;
 /* Nonzero for the 64bit model: ints, longs, and pointers are 64 bits.  */
 #define MASK_64BIT             0x400
 
+/* Disable use of FPRs.  */
+#define MASK_NO_FPR            0x800
+
 #define TARGET_POWER                   (target_flags & MASK_POWER)
 #define TARGET_POWER2                  (target_flags & MASK_POWER2)
 #define TARGET_POWERPC                 (target_flags & MASK_POWERPC)
@@ -148,6 +151,7 @@ extern int target_flags;
 #define TARGET_NO_SUM_IN_TOC           (target_flags & MASK_NO_SUM_IN_TOC)
 #define TARGET_MINIMAL_TOC             (target_flags & MASK_MINIMAL_TOC)
 #define TARGET_64BIT                   (target_flags & MASK_64BIT)
+#define TARGET_NO_FPR                  (target_flags & MASK_NO_FPR)
 
 /* Run-time compilation parameters selecting different hardware subsets.
 
@@ -180,6 +184,8 @@ extern int target_flags;
   {"minimal-toc",      MASK_MINIMAL_TOC},                      \
   {"minimal-toc",      - (MASK_NO_FP_IN_TOC | MASK_NO_SUM_IN_TOC)}, \
   {"no-minimal-toc",   - MASK_MINIMAL_TOC},                    \
+  {"fp-regs",          - MASK_NO_FPR},                         \
+  {"no-fp-regs",       MASK_NO_FPR},                           \
   {"",                 TARGET_DEFAULT}}
 
 #define TARGET_DEFAULT MASK_POWER
@@ -566,11 +572,17 @@ extern char *rs6000_cpu_string;
 
 /* Define this macro to change register usage conditional on target flags.
    Set MQ register fixed (already call_used) if not POWER architecture
-   (RIOS1, RIOS2, RSC, and PPC601) so that it will not be allocated.  */
-
-#define CONDITIONAL_REGISTER_USAGE                                     \
-    if (!TARGET_POWER)                                                 \
-       fixed_regs[64] = 1;
+   (RIOS1, RIOS2, RSC, and PPC601) so that it will not be allocated.
+   Conditionally disable FPRs.  */
+
+#define CONDITIONAL_REGISTER_USAGE     \
+{                                      \
+  if (! TARGET_POWER)                  \
+    fixed_regs[64] = 1;                        \
+  if (TARGET_NO_FPR)                   \
+    for (i = 32; i < 64; i++)                  \
+      fixed_regs[i] = call_used_regs[i] = 1; \
+}
 
 /* Specify the registers used for certain standard purposes.
    The values of these macros are register numbers.  */