+2010-07-02 Eric Botcazou <ebotcazou@adacore.com>
+
+ * expr.h (emit_stack_probe): Declare.
+ * explow.c (emit_stack_probe): Make global.
+ (anti_adjust_stack_and_probe): Fix comments.
+ * config/sparc/linux.h (STACK_CHECK_STATIC_BUILTIN): Define to 1.
+ * config/sparc/linux64.h (STACK_CHECK_STATIC_BUILTIN): Likewise.
+ * config/sparc/sol2.h (STACK_CHECK_STATIC_BUILTIN): Likewise.
+ * config/sparc/sparc.c: Include except.h.
+ (sparc_emit_probe_stack_range): New function.
+ (output_probe_stack_range): Likewise.
+ (sparc_expand_prologue): Invoke sparc_emit_probe_stack_range if static
+ built-in stack checking is enabled.
+ * config/sparc/sparc-protos.h (output_probe_stack_range): Declare.
+ * config/sparc/sparc.md (UNSPECV_PROBE_STACK_RANGE): New constant.
+ (probe_stack_range): New insn.
+
2010-07-02 Richard Guenther <rguenther@suse.de>
PR target/43958
2010-07-02 Jan Hubicka <jh@suse.cz>
- * ipa-split.c (verify_non_ssa_vars): Break out from ...; perform DFS walk
- backwards from entry_bb to check only those basic block of header
+ * ipa-split.c (verify_non_ssa_vars): Break out from ...; perform DFS
+ walk backwards from entry_bb to check only those basic block of header
that might lead to execution of split part.
(consider_split) ... here.
(find_return_bb): Allow assignment in return BB.
(find_retval): New.
- (split_function): Fix name of cloned function; take care of updating return
- value in return_bb containing move.
+ (split_function): Fix name of cloned function; take care of updating
+ return value in return_bb containing move.
2010-07-02 Andreas Schwab <schwab@linux-m68k.org>
#include "insn-attr.h"
#include "flags.h"
#include "function.h"
+#include "except.h"
#include "expr.h"
#include "optabs.h"
#include "recog.h"
#endif
}
+#define PROBE_INTERVAL (1 << STACK_CHECK_PROBE_INTERVAL_EXP)
+
+#if PROBE_INTERVAL > 4096
+#error Cannot use indexed addressing mode for stack probing
+#endif
+
+/* Emit code to probe a range of stack addresses from FIRST to FIRST+SIZE,
+ inclusive. These are offsets from the current stack pointer.
+
+ Note that we don't use the REG+REG addressing mode for the probes because
+ of the stack bias in 64-bit mode. And it doesn't really buy us anything
+ so the advantages of having a single code win here. */
+
+static void
+sparc_emit_probe_stack_range (HOST_WIDE_INT first, HOST_WIDE_INT size)
+{
+ rtx g1 = gen_rtx_REG (Pmode, 1);
+
+ /* See if we have a constant small number of probes to generate. If so,
+ that's the easy case. */
+ if (size <= PROBE_INTERVAL)
+ {
+ emit_move_insn (g1, GEN_INT (first));
+ emit_insn (gen_rtx_SET (VOIDmode, g1,
+ gen_rtx_MINUS (Pmode, stack_pointer_rtx, g1)));
+ emit_stack_probe (plus_constant (g1, -size));
+ }
+
+ /* The run-time loop is made up of 10 insns in the generic case while the
+ compile-time loop is made up of 4+2*(n-2) insns for n # of intervals. */
+ else if (size <= 5 * PROBE_INTERVAL)
+ {
+ HOST_WIDE_INT i;
+
+ emit_move_insn (g1, GEN_INT (first + PROBE_INTERVAL));
+ emit_insn (gen_rtx_SET (VOIDmode, g1,
+ gen_rtx_MINUS (Pmode, stack_pointer_rtx, g1)));
+ emit_stack_probe (g1);
+
+ /* Probe at FIRST + N * PROBE_INTERVAL for values of N from 2 until
+ it exceeds SIZE. If only two probes are needed, this will not
+ generate any code. Then probe at FIRST + SIZE. */
+ for (i = 2 * PROBE_INTERVAL; i < size; i += PROBE_INTERVAL)
+ {
+ emit_insn (gen_rtx_SET (VOIDmode, g1,
+ plus_constant (g1, -PROBE_INTERVAL)));
+ emit_stack_probe (g1);
+ }
+
+ emit_stack_probe (plus_constant (g1, (i - PROBE_INTERVAL) - size));
+ }
+
+ /* Otherwise, do the same as above, but in a loop. Note that we must be
+ extra careful with variables wrapping around because we might be at
+ the very top (or the very bottom) of the address space and we have
+ to be able to handle this case properly; in particular, we use an
+ equality test for the loop condition. */
+ else
+ {
+ HOST_WIDE_INT rounded_size;
+ rtx g4 = gen_rtx_REG (Pmode, 4);
+
+ emit_move_insn (g1, GEN_INT (first));
+
+
+ /* Step 1: round SIZE to the previous multiple of the interval. */
+
+ rounded_size = size & -PROBE_INTERVAL;
+ emit_move_insn (g4, GEN_INT (rounded_size));
+
+
+ /* Step 2: compute initial and final value of the loop counter. */
+
+ /* TEST_ADDR = SP + FIRST. */
+ emit_insn (gen_rtx_SET (VOIDmode, g1,
+ gen_rtx_MINUS (Pmode, stack_pointer_rtx, g1)));
+
+ /* LAST_ADDR = SP + FIRST + ROUNDED_SIZE. */
+ emit_insn (gen_rtx_SET (VOIDmode, g4, gen_rtx_MINUS (Pmode, g1, g4)));
+
+
+ /* Step 3: the loop
+
+ while (TEST_ADDR != LAST_ADDR)
+ {
+ TEST_ADDR = TEST_ADDR + PROBE_INTERVAL
+ probe at TEST_ADDR
+ }
+
+ probes at FIRST + N * PROBE_INTERVAL for values of N from 1
+ until it is equal to ROUNDED_SIZE. */
+
+ if (TARGET_64BIT)
+ emit_insn (gen_probe_stack_rangedi (g1, g1, g4));
+ else
+ emit_insn (gen_probe_stack_rangesi (g1, g1, g4));
+
+
+ /* Step 4: probe at FIRST + SIZE if we cannot assert at compile-time
+ that SIZE is equal to ROUNDED_SIZE. */
+
+ if (size != rounded_size)
+ emit_stack_probe (plus_constant (g4, rounded_size - size));
+ }
+
+ /* Make sure nothing is scheduled before we are done. */
+ emit_insn (gen_blockage ());
+}
+
+/* Probe a range of stack addresses from REG1 to REG2 inclusive. These are
+ absolute addresses. */
+
+const char *
+output_probe_stack_range (rtx reg1, rtx reg2)
+{
+ static int labelno = 0;
+ char loop_lab[32], end_lab[32];
+ rtx xops[2];
+
+ ASM_GENERATE_INTERNAL_LABEL (loop_lab, "LPSRL", labelno);
+ ASM_GENERATE_INTERNAL_LABEL (end_lab, "LPSRE", labelno++);
+
+ ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, loop_lab);
+
+ /* Jump to END_LAB if TEST_ADDR == LAST_ADDR. */
+ xops[0] = reg1;
+ xops[1] = reg2;
+ output_asm_insn ("cmp\t%0, %1", xops);
+ if (TARGET_ARCH64)
+ fputs ("\tbe,pn\t%xcc,", asm_out_file);
+ else
+ fputs ("\tbe\t", asm_out_file);
+ assemble_name_raw (asm_out_file, end_lab);
+ fputc ('\n', asm_out_file);
+
+ /* TEST_ADDR = TEST_ADDR + PROBE_INTERVAL. */
+ xops[1] = GEN_INT (-PROBE_INTERVAL);
+ output_asm_insn (" add\t%0, %1, %0", xops);
+
+ /* Probe at TEST_ADDR and branch. */
+ if (TARGET_ARCH64)
+ fputs ("\tba,pt\t%xcc,", asm_out_file);
+ else
+ fputs ("\tba\t", asm_out_file);
+ assemble_name_raw (asm_out_file, loop_lab);
+ fputc ('\n', asm_out_file);
+ xops[1] = GEN_INT (SPARC_STACK_BIAS);
+ output_asm_insn (" st\t%%g0, [%0+%1]", xops);
+
+ ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, end_lab);
+
+ return "";
+}
+
/* Save/restore call-saved registers from LOW to HIGH at BASE+OFFSET
as needed. LOW should be double-word aligned for 32-bit registers.
Return the new OFFSET. */
/* Advertise that the data calculated just above are now valid. */
sparc_prologue_data_valid_p = true;
+ if (flag_stack_check == STATIC_BUILTIN_STACK_CHECK && actual_fsize)
+ sparc_emit_probe_stack_range (STACK_CHECK_PROTECT, actual_fsize);
+
if (sparc_leaf_function_p)
{
frame_base_reg = stack_pointer_rtx;
#include "output.h"
static rtx break_out_memory_refs (rtx);
-static void emit_stack_probe (rtx);
/* Truncate and perhaps sign-extend C as appropriate for MODE. */
\f
/* Emit one stack probe at ADDRESS, an address within the stack. */
-static void
+void
emit_stack_probe (rtx address)
{
rtx memref = gen_rtx_MEM (word_mode, address);
HOST_WIDE_INT isize = INTVAL (size), i;
bool first_probe = true;
- /* Adjust SP and probe to PROBE_INTERVAL + N * PROBE_INTERVAL for
+ /* Adjust SP and probe at PROBE_INTERVAL + N * PROBE_INTERVAL for
values of N from 1 until it exceeds SIZE. If only one probe is
needed, this will not generate any code. Then adjust and probe
to PROBE_INTERVAL + SIZE. */
/* Step 3: the loop
- while (SP != LAST_ADDR)
- {
- SP = SP + PROBE_INTERVAL
- probe at SP
- }
+ while (SP != LAST_ADDR)
+ {
+ SP = SP + PROBE_INTERVAL
+ probe at SP
+ }
- adjusts SP and probes to PROBE_INTERVAL + N * PROBE_INTERVAL for
+ adjusts SP and probes at PROBE_INTERVAL + N * PROBE_INTERVAL for
values of N from 1 until it is equal to ROUNDED_SIZE. */
emit_label (loop_lab);
emit_label (end_lab);
- /* Step 4: adjust SP and probe to PROBE_INTERVAL + SIZE if we cannot
+ /* Step 4: adjust SP and probe at PROBE_INTERVAL + SIZE if we cannot
assert at compile-time that SIZE is equal to ROUNDED_SIZE. */
/* TEMP = SIZE - ROUNDED_SIZE. */
projects / platform / upstream / linaro-gcc.git / commitdiff