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