rx.c (rx_conditional_register_usage): Do not warn if no fixed registers are available for interrupt handlers.
* config/rx/rx.c (rx_conditional_register_usage): Do not warn if
no fixed registers are available for interrupt handlers. Do not
fix normal registers.
(MUST_SAVE_ACC_REGISTER): New macro.
(rx_get_stack_layout): Create a stack frame for fast interrupt
handlers, if necessary. Push extra registers if needed in order
to save the accumulator.
(rx_expand_prologue): Create a stack frame for fast interrupt
handlers, if necessary.
(rx_expand_builtin_mvfc): Handle the case where there is no
target.
From-SVN: r154903
This commit is contained in:
Nick Clifton
Nick Clifton
parent
57cdf653e3
commit
dafcb54e42
@ -1,3 +1,17 @@
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2009-12-02 Nick Clifton <nickc@redhat.com>
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* config/rx/rx.c (rx_conditional_register_usage): Do not warn if
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no fixed registers are available for interrupt handlers. Do not
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fix normal registers.
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(MUST_SAVE_ACC_REGISTER): New macro.
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(rx_get_stack_layout): Create a stack frame for fast interrupt
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handlers, if necessary. Push extra registers if needed in order
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to save the accumulator.
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(rx_expand_prologue): Create a stack frame for fast interrupt
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handlers, if necessary.
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(rx_expand_builtin_mvfc): Handle the case where there is no
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target.
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2009-12-01 Sebastian Pop <sebastian.pop@amd.com>
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* config/i386/abmintrin.h (__lzcnt16): New.
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@ -887,46 +887,25 @@ rx_conditional_register_usage (void)
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if (use_fixed_regs)
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{
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unsigned int switched = 0;
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unsigned int r;
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memcpy (saved_fixed_regs, fixed_regs, sizeof fixed_regs);
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memcpy (saved_call_used_regs, call_used_regs, sizeof call_used_regs);
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/* This is for fast interrupt handlers. Any register in
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the range r10 to r13 (inclusive) that is currently
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marked as fixed is now a viable, call-saved register.
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All other registers are fixed. */
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memcpy (saved_fixed_regs, fixed_regs, sizeof fixed_regs);
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memcpy (saved_call_used_regs, call_used_regs, sizeof call_used_regs);
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for (r = 1; r < 10; r++)
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fixed_regs[r] = call_used_regs[r] = 1;
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marked as fixed is now a viable, call-used register. */
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for (r = 10; r <= 13; r++)
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if (fixed_regs[r])
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{
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fixed_regs[r] = 0;
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call_used_regs[r] = 1;
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++ switched;
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}
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else
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{
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fixed_regs[r] = 1;
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call_used_regs[r] = 1;
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}
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fixed_regs[14] = call_used_regs[14] = 1;
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fixed_regs[15] = call_used_regs[15] = 1;
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if (switched == 0)
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{
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static bool warned = false;
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if (! warned)
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{
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warning (0, "no fixed registers available "
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"for use by fast interrupt handler");
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warned = true;
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}
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}
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/* Mark r7 as fixed. This is just a hack to avoid
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altering the reg_alloc_order array so that the newly
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freed r10-r13 registers are the preferred registers. */
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fixed_regs[7] = call_used_regs[7] = 1;
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}
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else
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{
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@ -1017,6 +996,11 @@ bit_count (unsigned int x)
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return (x + (x >> 16)) & 0x3f;
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}
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#define MUST_SAVE_ACC_REGISTER \
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(TARGET_SAVE_ACC_REGISTER \
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&& (is_interrupt_func (NULL_TREE) \
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|| is_fast_interrupt_func (NULL_TREE)))
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/* Returns either the lowest numbered and highest numbered registers that
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occupy the call-saved area of the stack frame, if the registers are
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stored as a contiguous block, or else a bitmask of the individual
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@ -1040,15 +1024,10 @@ rx_get_stack_layout (unsigned int * lowest,
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unsigned int pushed_mask;
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unsigned int unneeded_pushes;
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if (is_naked_func (NULL_TREE)
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|| is_fast_interrupt_func (NULL_TREE))
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if (is_naked_func (NULL_TREE))
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{
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/* Naked functions do not create their own stack frame.
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Instead the programmer must do that for us.
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Fast interrupt handlers use fixed registers that have
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been epsecially released to the function, so they do
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not need or want a stack frame. */
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Instead the programmer must do that for us. */
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* lowest = 0;
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* highest = 0;
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* register_mask = 0;
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@ -1063,7 +1042,14 @@ rx_get_stack_layout (unsigned int * lowest,
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&& (! call_used_regs[reg]
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/* Even call clobbered registered must
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be pushed inside interrupt handlers. */
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|| is_interrupt_func (NULL_TREE)))
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|| is_interrupt_func (NULL_TREE)
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/* Likewise for fast interrupt handlers, except registers r10 -
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r13. These are normally call-saved, but may have been set
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to call-used by rx_conditional_register_usage. If so then
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they can be used in the fast interrupt handler without
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saving them on the stack. */
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|| (is_fast_interrupt_func (NULL_TREE)
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&& ! IN_RANGE (reg, 10, 13))))
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{
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if (low == 0)
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low = reg;
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@ -1078,6 +1064,18 @@ rx_get_stack_layout (unsigned int * lowest,
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fixed_reg = reg;
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}
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/* If we have to save the accumulator register, make sure
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that at least two registers are pushed into the frame. */
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if (MUST_SAVE_ACC_REGISTER
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&& bit_count (save_mask) < 2)
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{
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save_mask |= (1 << 13) | (1 << 14);
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if (low == 0)
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low = 13;
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if (high == 0)
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high = 14;
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}
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/* Decide if it would be faster fill in the call-saved area of the stack
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frame using multiple PUSH instructions instead of a single PUSHM
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instruction.
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@ -1207,9 +1205,7 @@ rx_expand_prologue (void)
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rtx insn;
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/* Naked functions use their own, programmer provided prologues. */
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if (is_naked_func (NULL_TREE)
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/* Fast interrupt functions never use the stack. */
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|| is_fast_interrupt_func (NULL_TREE))
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if (is_naked_func (NULL_TREE))
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return;
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rx_get_stack_layout (& low, & high, & mask, & frame_size, & stack_size);
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@ -1236,13 +1232,13 @@ rx_expand_prologue (void)
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mark_frame_related (insn);
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}
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if (is_interrupt_func (NULL_TREE) && TARGET_SAVE_ACC_REGISTER)
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if (MUST_SAVE_ACC_REGISTER)
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{
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unsigned int acc_high, acc_low;
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/* Interrupt handlers have to preserve the accumulator
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register if so requested by the user. Use the first
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two pushed register as intermediaries. */
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two pushed registers as intermediaries. */
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if (mask)
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{
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acc_low = acc_high = 0;
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@ -1510,7 +1506,7 @@ rx_expand_epilogue (bool is_sibcall)
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emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
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GEN_INT (total_size)));
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if (is_interrupt_func (NULL_TREE) && TARGET_SAVE_ACC_REGISTER)
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if (MUST_SAVE_ACC_REGISTER)
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{
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unsigned int acc_low, acc_high;
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@ -1901,6 +1897,9 @@ rx_expand_builtin_mvfc (tree t_arg, rtx target)
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if (! CONST_INT_P (arg))
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return NULL_RTX;
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if (target == NULL_RTX)
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return NULL_RTX;
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if (! REG_P (target))
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target = force_reg (SImode, target);
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@ -2135,7 +2134,7 @@ rx_func_attr_inlinable (const_tree decl)
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a function_decl or NULL if this is an indirect call, using EXP */
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static bool
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rx_function_ok_for_sibcall (tree decl, tree exp)
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rx_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED)
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{
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/* Do not allow indirect tailcalls. The
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sibcall patterns do not support them. */
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