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Save Maverick registers on function entry and restore them on exit if they
are modified within the function and are among those that must be preserved
across function calls.
Also check whether Maverick registers need restoring when deciding whether to
return directly from the middle of a function without an epilogue.
This combines futaris' [saveregs] and [use_return_insn] patches.
Index: gcc-4.2.4/gcc/config/arm/arm.c
===================================================================
--- gcc-4.2.4.orig/gcc/config/arm/arm.c 2007-09-01 16:28:30.000000000 +0100
+++ gcc-4.2.4/gcc/config/arm/arm.c 2009-08-09 15:45:22.000000000 +0100
@@ -1577,6 +1577,12 @@
if (regs_ever_live[regno] && !call_used_regs[regno])
return 0;
+ /* Likewise Maverick regs. */
+ if (TARGET_HARD_FLOAT && TARGET_MAVERICK)
+ for (regno = FIRST_CIRRUS_FP_REGNUM; regno <= LAST_CIRRUS_FP_REGNUM; regno++)
+ if (regs_ever_live[regno] && !call_used_regs[regno])
+ return 0;
+
if (TARGET_REALLY_IWMMXT)
for (regno = FIRST_IWMMXT_REGNUM; regno <= LAST_IWMMXT_REGNUM; regno++)
if (regs_ever_live[regno] && ! call_used_regs [regno])
@@ -9889,6 +9895,17 @@
reg, FP_REGNUM, floats_offset - vfp_offset);
}
}
+ else if (arm_fpu_arch == FPUTYPE_MAVERICK)
+ {
+ for (reg = LAST_CIRRUS_FP_REGNUM; reg >= FIRST_CIRRUS_FP_REGNUM; reg--)
+ if (regs_ever_live[reg] && !call_used_regs[reg])
+ {
+ floats_offset += 8;
+ asm_fprintf (f, "\tcfldrd\tmvd%d, [%r, #-%d]\n",
+ reg - FIRST_CIRRUS_FP_REGNUM, FP_REGNUM,
+ floats_offset - vfp_offset);
+ }
+ }
else
{
start_reg = LAST_FPA_REGNUM;
@@ -10035,6 +10052,13 @@
asm_fprintf (f, "\tldfe\t%r, [%r], #12\n",
reg, SP_REGNUM);
}
+ else if (arm_fpu_arch == FPUTYPE_MAVERICK)
+ {
+ for (reg = FIRST_CIRRUS_FP_REGNUM; reg <= LAST_CIRRUS_FP_REGNUM; reg++)
+ if (regs_ever_live[reg] && !call_used_regs[reg])
+ asm_fprintf (f, "\tcfldrd\tmvd%u, [%r], #8\n",
+ reg - FIRST_CIRRUS_FP_REGNUM, SP_REGNUM);
+ }
else
{
start_reg = FIRST_FPA_REGNUM;
@@ -10529,6 +10553,11 @@
func_type = arm_current_func_type ();
if (! IS_VOLATILE (func_type))
{
+ /* Space for saved MAVERICK registers. */
+ for (regno = FIRST_CIRRUS_FP_REGNUM; regno <= LAST_CIRRUS_FP_REGNUM; regno++)
+ if (regs_ever_live[regno] && ! call_used_regs[regno])
+ saved += 8;
+
/* Space for saved FPA registers. */
for (regno = FIRST_FPA_REGNUM; regno <= LAST_FPA_REGNUM; regno++)
if (regs_ever_live[regno] && ! call_used_regs[regno])
@@ -10837,6 +10866,19 @@
saved_regs += 12;
}
}
+ else if (arm_fpu_arch == FPUTYPE_MAVERICK)
+ {
+ for (reg = LAST_CIRRUS_FP_REGNUM; reg >= FIRST_CIRRUS_FP_REGNUM; reg--)
+ if (regs_ever_live[reg] && !call_used_regs[reg])
+ {
+ insn = gen_rtx_PRE_DEC (DFmode, stack_pointer_rtx);
+ insn = gen_rtx_MEM (DFmode, insn);
+ insn = emit_insn (gen_rtx_SET (VOIDmode, insn,
+ gen_rtx_REG (DFmode, reg)));
+ RTX_FRAME_RELATED_P (insn) = 1;
+ saved_regs += 8;
+ }
+ }
else
{
start_reg = LAST_FPA_REGNUM;
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