commit e7519110827a59eb7275591db640bdbdfd31ba15 Author: law Date: Wed Sep 20 05:43:28 2017 +0000 * combine-stack-adj.c (combine_stack_adjustments_for_block): Do nothing for stack adjustments with REG_STACK_CHECK. * sched-deps.c (parse_add_or_inc): Reject insns with REG_STACK_CHECK from dependency breaking. * config/i386/i386.c (pro_epilogue_adjust_stack): Return insn. (ix86_adjust_satck_and_probe_stack_clash): Add REG_STACK_NOTEs. * reg-notes.def (STACK_CHECK): New note. * gcc.target/i386/stack-check-11.c: New test. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@252999 138bc75d-0d04-0410-961f-82ee72b054a4 diff --git a/gcc/combine-stack-adj.c b/gcc/combine-stack-adj.c index 9ec14a3e443..82d6dba856f 100644 --- a/gcc/combine-stack-adj.c +++ b/gcc/combine-stack-adj.c @@ -508,6 +508,8 @@ combine_stack_adjustments_for_block (basic_block bb) continue; set = single_set_for_csa (insn); + if (set && find_reg_note (insn, REG_STACK_CHECK, NULL_RTX)) + set = NULL_RTX; if (set) { rtx dest = SET_DEST (set); diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 088dca2001f..5aff9b9d113 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -12900,7 +12900,7 @@ ix86_add_queued_cfa_restore_notes (rtx insn) zero if %r11 register is live and cannot be freely used and positive otherwise. */ -static void +static rtx pro_epilogue_adjust_stack (rtx dest, rtx src, rtx offset, int style, bool set_cfa) { @@ -12987,6 +12987,7 @@ pro_epilogue_adjust_stack (rtx dest, rtx src, rtx offset, m->fs.sp_offset = ooffset - INTVAL (offset); m->fs.sp_valid = valid; } + return insn; } /* Find an available register to be used as dynamic realign argument @@ -13333,9 +13334,11 @@ ix86_adjust_stack_and_probe_stack_clash (const HOST_WIDE_INT size) for (i = probe_interval; i <= size; i += probe_interval) { /* Allocate PROBE_INTERVAL bytes. */ - pro_epilogue_adjust_stack (stack_pointer_rtx, stack_pointer_rtx, - GEN_INT (-probe_interval), -1, - m->fs.cfa_reg == stack_pointer_rtx); + rtx insn + = pro_epilogue_adjust_stack (stack_pointer_rtx, stack_pointer_rtx, + GEN_INT (-PROBE_INTERVAL), -1, + m->fs.cfa_reg == stack_pointer_rtx); + add_reg_note (insn, REG_STACK_CHECK, const0_rtx); /* And probe at *sp. */ emit_stack_probe (stack_pointer_rtx); diff --git a/gcc/reg-notes.def b/gcc/reg-notes.def index 8734d26e5b4..18cf7e3cfc0 100644 --- a/gcc/reg-notes.def +++ b/gcc/reg-notes.def @@ -223,6 +223,10 @@ REG_NOTE (ARGS_SIZE) pseudo reg. */ REG_NOTE (RETURNED) +/* Indicates the instruction is a stack check probe that should not + be combined with other stack adjustments. */ +REG_NOTE (STACK_CHECK) + /* Used to mark a call with the function decl called by the call. The decl might not be available in the call due to splitting of the call insn. This note is a SYMBOL_REF. */ diff --git a/gcc/sched-deps.c b/gcc/sched-deps.c index b2393bf28fb..564f3fb1559 100644 --- a/gcc/sched-deps.c +++ b/gcc/sched-deps.c @@ -4717,6 +4717,11 @@ parse_add_or_inc (struct mem_inc_info *mii, rtx_insn *insn, bool before_mem) if (RTX_FRAME_RELATED_P (insn) || !pat) return false; + /* Do not allow breaking data dependencies for insns that are marked + with REG_STACK_CHECK. */ + if (find_reg_note (insn, REG_STACK_CHECK, NULL)) + return false; + /* Result must be single reg. */ if (!REG_P (SET_DEST (pat))) return false; diff --git a/gcc/testsuite/gcc.target/i386/stack-check-11.c b/gcc/testsuite/gcc.target/i386/stack-check-11.c new file mode 100644 index 00000000000..183103f01e5 --- /dev/null +++ b/gcc/testsuite/gcc.target/i386/stack-check-11.c @@ -0,0 +1,16 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fstack-clash-protection" } */ +/* { dg-require-effective-target supports_stack_clash_protection } */ + +extern void arf (unsigned long int *, unsigned long int *); +void +frob () +{ + unsigned long int num[859]; + unsigned long int den[859]; + arf (den, num); +} + +/* { dg-final { scan-assembler-times "subq" 4 } } */ +/* { dg-final { scan-assembler-times "orq" 3 } } */ +