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re PR target/39118 (x86_64 red zone violation)

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PR target/39118
	* config/i386/i386.c (expand_prologue): Emit blockage at the end
	of function prologue when frame pointer is used to access
	red zone area.

From-SVN: r144063
This commit is contained in:
Uros Bizjak 2009-02-10 17:12:33 +01:00
parent f76f0eddf7
commit dbf9ee15b8
2 changed files with 25 additions and 8 deletions
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18
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2009-02-10 Uros Bizjak <ubizjak@gmail.com>
PR target/39118
* config/i386/i386.c (expand_prologue): Emit blockage at the end
of function prologue when frame pointer is used to access
red zone area.
2009-02-10 Richard Guenther <rguenther@suse.de>
PR middle-end/39127
@ -100,8 +107,7 @@
2009-02-06 Nick Clifton <nickc@redhat.com>
* config/m32c/m32c.h (PCC_BITFIELD_TYPE_MATTERS): Define to
zero.
* config/m32c/m32c.h (PCC_BITFIELD_TYPE_MATTERS): Define to zero.
2009-02-06 Paolo Bonzini <bonzini@gnu.org>
@ -249,7 +255,7 @@
2009-02-02 Catherine Moore <clm@codesourcery.com>
* sde.h (SUBTARGET_ARM_SPEC): Don;t assemble -fpic code as -mabicalls.
* sde.h (SUBTARGET_ARM_SPEC): Don't assemble -fpic code as -mabicalls.
2009-02-02 Richard Sandiford <rdsandiford@googlemail.com>
@ -444,8 +450,7 @@
* regclass.c: Rename reginfo.c. Change file description.
(FORBIDDEN_INC_DEC_CLASSES): Remove.
(reg_class_superclasses, forbidden_inc_dec_class, in_inc_dec):
Remove.
(reg_class_superclasses, forbidden_inc_dec_class, in_inc_dec): Remove.
(init_reg_sets_1): Remove code for evaluation of
reg_class_superclasses and losing_caller_save_reg_set.
(init_regs): Remove init_reg_autoinc.
@ -579,8 +584,7 @@
2009-01-28 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/38740
* reorg.c (gate_handle_delay_slots): Avoid dbr scheduling
if !optimize.
* reorg.c (gate_handle_delay_slots): Avoid dbr scheduling if !optimize.
* config/mips/mips.c (mips_reorg): Likewise.
2009-01-28 Richard Guenther <rguenther@suse.de>

15
gcc/config/i386/i386.c
View File

@ -7997,6 +7997,7 @@ ix86_expand_prologue (void)
{
rtx insn;
bool pic_reg_used;
bool emit_blockage = false;
struct ix86_frame frame;
HOST_WIDE_INT allocate;
@ -8214,7 +8215,7 @@ ix86_expand_prologue (void)
{
if (pic_reg_used)
emit_insn (gen_prologue_use (pic_offset_table_rtx));
emit_insn (gen_blockage ());
emit_blockage = true;
}
if (crtl->drap_reg && !crtl->stack_realign_needed)
@ -8227,6 +8228,18 @@ ix86_expand_prologue (void)
insn = emit_insn (gen_rtx_SET (VOIDmode, crtl->drap_reg, x));
}
/* Prevent instructions from being scheduled into register save push
sequence when access to the redzone area is done through frame pointer.
The offset betweeh the frame pointer and the stack pointer is calculated
relative to the value of the stack pointer at the end of the function
prologue, and moving instructions that access redzone area via frame
pointer inside push sequence violates this assumption. */
if (frame_pointer_needed && frame.red_zone_size)
emit_blockage = true;
if (emit_blockage)
emit_insn (gen_blockage ());
/* Emit cld instruction if stringops are used in the function. */
if (TARGET_CLD && ix86_current_function_needs_cld)
emit_insn (gen_cld ());