On Fri, Jun 7, 2019 at 1:22 AM Richard Biener <rguent...@suse.de> wrote:
>
> On Fri, 7 Jun 2019, Richard Sandiford wrote:
>
> > "H.J. Lu" <hjl.to...@gmail.com> writes:
> > > locate_and_pad_parm is called when expanding function call from
> > > initialize_argument_information and when generating function body
> > > from assign_parm_find_entry_rtl:
> > >
> > > /* Remember if the outgoing parameter requires extra alignment on the
> > > calling function side. */
> > > if (crtl->stack_alignment_needed < boundary)
> > > crtl->stack_alignment_needed = boundary;
> > > if (crtl->preferred_stack_boundary < boundary)
> > > crtl->preferred_stack_boundary = boundary;
> > >
> > > stack_alignment_needed and preferred_stack_boundary should be updated
> > > only when expanding function call, not when generating function body.
> > > Add an argument, outgoing_p, to locate_and_pad_parm to indicate for
> > > expanding function call. Update stack_alignment_needed and
> > > preferred_stack_boundary if the parameter is passed on stack and only
> > > when expanding function call.
> > >
> > > Tested on Linux/x86-64.
> > >
> > > OK for trunk?
> > >
> > > Thanks.
> > >
> > > --
> > > H.J.
> > >
> > > From e91e20ad8e10373db2c6d8f99a3da0bbf46c5c34 Mon Sep 17 00:00:00 2001
> > > From: "H.J. Lu" <hjl.to...@gmail.com>
> > > Date: Wed, 5 Jun 2019 12:55:19 -0700
> > > Subject: [PATCH] Update preferred_stack_boundary only when expanding
> > > function
> > > call
> > >
> > > locate_and_pad_parm is called when expanding function call from
> > > initialize_argument_information and when generating function body
> > > from assign_parm_find_entry_rtl:
> > >
> > > /* Remember if the outgoing parameter requires extra alignment on the
> > > calling function side. */
> > > if (crtl->stack_alignment_needed < boundary)
> > > crtl->stack_alignment_needed = boundary;
> > > if (crtl->preferred_stack_boundary < boundary)
> > > crtl->preferred_stack_boundary = boundary;
> > >
> > > stack_alignment_needed and preferred_stack_boundary should be updated
> > > only when expanding function call, not when generating function body.
> > > Add an argument, outgoing_p, to locate_and_pad_parm to indicate for
> > > expanding function call. Update stack_alignment_needed and
> > > preferred_stack_boundary if the parameter is passed on stack and only
> > > when expanding function call.
> > >
> > > Tested on Linux/x86-64.
> > >
> > > gcc/
> > >
> > > PR rtl-optimization/90765
> > > * function.c (assign_parm_find_entry_rtl): Pass false to
> > > locate_and_pad_parm.
> > > (locate_and_pad_parm): Add an argument, outgoing_p, to indicate
> > > for expanding function call. Update stack_alignment_needed and
> > > preferred_stack_boundary only if outgoing_p is true and the
> > > the parameter is passed on stack.
> > > * function.h (locate_and_pad_parm): Add an argument, outgoing_p,
> > > defaulting to true.
> > >
> > > gcc/testsuite/
> > >
> > > PR rtl-optimization/90765
> > > * gcc.target/i386/pr90765-1.c: New test.
> > > * gcc.target/i386/pr90765-2.c: Likewise.
> > > ---
> > > gcc/function.c | 21 +++++++++++++--------
> > > gcc/function.h | 3 ++-
> > > gcc/testsuite/gcc.target/i386/pr90765-1.c | 11 +++++++++++
> > > gcc/testsuite/gcc.target/i386/pr90765-2.c | 18 ++++++++++++++++++
> > > 4 files changed, 44 insertions(+), 9 deletions(-)
> > > create mode 100644 gcc/testsuite/gcc.target/i386/pr90765-1.c
> > > create mode 100644 gcc/testsuite/gcc.target/i386/pr90765-2.c
> > >
> > > diff --git a/gcc/function.c b/gcc/function.c
> > > index e30ee259bec..9b6673f6f0d 100644
> > > --- a/gcc/function.c
> > > +++ b/gcc/function.c
> > > @@ -2601,7 +2601,7 @@ assign_parm_find_entry_rtl (struct
> > > assign_parm_data_all *all,
> > > locate_and_pad_parm (data->promoted_mode, data->passed_type, in_regs,
> > > all->reg_parm_stack_space,
> > > entry_parm ? data->partial : 0, current_function_decl,
> > > - &all->stack_args_size, &data->locate);
> > > + &all->stack_args_size, &data->locate, false);
> > >
> > > /* Update parm_stack_boundary if this parameter is passed in the
> > > stack. */
> > > @@ -3954,7 +3954,8 @@ locate_and_pad_parm (machine_mode passed_mode, tree
> > > type, int in_regs,
> > > int reg_parm_stack_space, int partial,
> > > tree fndecl ATTRIBUTE_UNUSED,
> > > struct args_size *initial_offset_ptr,
> > > - struct locate_and_pad_arg_data *locate)
> > > + struct locate_and_pad_arg_data *locate,
> > > + bool outgoing_p)
> > > {
> > > tree sizetree;
> > > pad_direction where_pad;
> > > @@ -4021,12 +4022,16 @@ locate_and_pad_parm (machine_mode passed_mode,
> > > tree type, int in_regs,
> > > }
> > > }
> > >
> > > - /* Remember if the outgoing parameter requires extra alignment on the
> > > - calling function side. */
> > > - if (crtl->stack_alignment_needed < boundary)
> > > - crtl->stack_alignment_needed = boundary;
> > > - if (crtl->preferred_stack_boundary < boundary)
> > > - crtl->preferred_stack_boundary = boundary;
> > > + if (outgoing_p && !in_regs)
> > > + {
> > > + /* Remember if the outgoing parameter requires extra alignment on
> > > + the calling function side if this parameter is passed in the
> > > + stack. */
> > > + if (crtl->stack_alignment_needed < boundary)
> > > + crtl->stack_alignment_needed = boundary;
> > > + if (crtl->preferred_stack_boundary < boundary)
> > > + crtl->preferred_stack_boundary = boundary;
> > > + }
> >
> > Just my opinion, but I think this shows that the code isn't really
> > in the right place. IMO locate_and_pad_parm should just describe
> > the ABI and is too low-level to be modifying global state like this.
> >
> > I think we could instead do this by walking over the argument vectors
> > in a subroutine of expand_call and emit_library_call_value_1.
> > expand_call is also where we do:
> >
> > /* Ensure current function's preferred stack boundary is at least
> > what we need. Stack alignment may also increase preferred stack
> > boundary. */
> > if (crtl->preferred_stack_boundary < preferred_stack_boundary)
> > crtl->preferred_stack_boundary = preferred_stack_boundary;
> > else
> > preferred_stack_boundary = crtl->preferred_stack_boundary;
>
> Agreed - that would be much cleaner.
>
Here is the updated patch to add update_stack_alignment_for_call.
Tested on Linux/x86-64. OK for trunk?
Thanks.
--
H.J.
From 00d81edc1e62c43c2084483df055ea68f4047679 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.to...@gmail.com>
Date: Wed, 5 Jun 2019 12:55:19 -0700
Subject: [PATCH] Update preferred_stack_boundary only when expanding function
call
locate_and_pad_parm is called when expanding function call from
initialize_argument_information and when generating function body
from assign_parm_find_entry_rtl:
/* Remember if the outgoing parameter requires extra alignment on the
calling function side. */
if (crtl->stack_alignment_needed < boundary)
crtl->stack_alignment_needed = boundary;
if (crtl->preferred_stack_boundary < boundary)
crtl->preferred_stack_boundary = boundary;
stack_alignment_needed and preferred_stack_boundary should be updated
only when expanding function call, not when generating function body.
Add update_stack_alignment_for_call to update stack alignment when
outgoing parameter is passed in the stack.
gcc/
PR rtl-optimization/90765
* calls.c (update_stack_alignment_for_call): New function.
(initialize_argument_information): Call
update_stack_alignment_for_call when outgoing parameter is
passed in the stack.
(emit_library_call_value_1): Likewise.
* function.c (locate_and_pad_parm): Don't update
stack_alignment_needed and preferred_stack_boundary.
gcc/testsuite/
PR rtl-optimization/90765
* gcc.target/i386/pr90765-1.c: New test.
* gcc.target/i386/pr90765-2.c: Likewise.
---
gcc/calls.c | 33 ++++++++++++++++++-----
gcc/function.c | 7 -----
gcc/testsuite/gcc.target/i386/pr90765-1.c | 11 ++++++++
gcc/testsuite/gcc.target/i386/pr90765-2.c | 18 +++++++++++++
4 files changed, 55 insertions(+), 14 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/i386/pr90765-1.c
create mode 100644 gcc/testsuite/gcc.target/i386/pr90765-2.c
diff --git a/gcc/calls.c b/gcc/calls.c
index c8a42680041..8ba82fbb6c0 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -1841,6 +1841,19 @@ maybe_complain_about_tail_call (tree call_expr, const char *reason)
error_at (EXPR_LOCATION (call_expr), "cannot tail-call: %s", reason);
}
+/* Update stack alignment when the parameter is passed in the stack
+ since the outgoing parameter requires extra alignment on the calling
+ function side. */
+
+static void
+update_stack_alignment_for_call (struct locate_and_pad_arg_data *locate)
+{
+ if (crtl->stack_alignment_needed < locate->boundary)
+ crtl->stack_alignment_needed = locate->boundary;
+ if (crtl->preferred_stack_boundary < locate->boundary)
+ crtl->preferred_stack_boundary = locate->boundary;
+}
+
/* Fill in ARGS_SIZE and ARGS array based on the parameters found in
CALL_EXPR EXP.
@@ -2162,15 +2175,18 @@ initialize_argument_information (int num_actuals ATTRIBUTE_UNUSED,
if (args[i].reg == 0 || args[i].partial != 0
|| reg_parm_stack_space > 0
|| args[i].pass_on_stack)
- locate_and_pad_parm (mode, type,
+ {
+ locate_and_pad_parm (mode, type,
#ifdef STACK_PARMS_IN_REG_PARM_AREA
- 1,
+ 1,
#else
- args[i].reg != 0,
+ args[i].reg != 0,
#endif
- reg_parm_stack_space,
- args[i].pass_on_stack ? 0 : args[i].partial,
- fndecl, args_size, &args[i].locate);
+ reg_parm_stack_space,
+ args[i].pass_on_stack ? 0 : args[i].partial,
+ fndecl, args_size, &args[i].locate);
+ update_stack_alignment_for_call (&args[i].locate);
+ }
#ifdef BLOCK_REG_PADDING
else
/* The argument is passed entirely in registers. See at which
@@ -4861,7 +4877,10 @@ emit_library_call_value_1 (int retval, rtx orgfun, rtx value,
if (argvec[count].reg == 0 || argvec[count].partial != 0
|| reg_parm_stack_space > 0)
- args_size.constant += argvec[count].locate.size.constant;
+ {
+ args_size.constant += argvec[count].locate.size.constant;
+ update_stack_alignment_for_call (&argvec[count].locate);
+ }
targetm.calls.function_arg_advance (args_so_far, Pmode, (tree) 0, true);
diff --git a/gcc/function.c b/gcc/function.c
index e30ee259bec..45b65dc0fd2 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -4021,13 +4021,6 @@ locate_and_pad_parm (machine_mode passed_mode, tree type, int in_regs,
}
}
- /* Remember if the outgoing parameter requires extra alignment on the
- calling function side. */
- if (crtl->stack_alignment_needed < boundary)
- crtl->stack_alignment_needed = boundary;
- if (crtl->preferred_stack_boundary < boundary)
- crtl->preferred_stack_boundary = boundary;
-
if (ARGS_GROW_DOWNWARD)
{
locate->slot_offset.constant = -initial_offset_ptr->constant;
diff --git a/gcc/testsuite/gcc.target/i386/pr90765-1.c b/gcc/testsuite/gcc.target/i386/pr90765-1.c
new file mode 100644
index 00000000000..178c3ff8054
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr90765-1.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512f" } */
+/* { dg-final { scan-assembler-not "and\[lq\]?\[\\t \]*\\$-64,\[\\t \]*%\[re\]?sp" } } */
+
+typedef int __v16si __attribute__ ((__vector_size__ (64)));
+
+void
+foo (__v16si x, int i0, int i1, int i2, int i3, int i4, int i5, __v16si *p)
+{
+ *p = x;
+}
diff --git a/gcc/testsuite/gcc.target/i386/pr90765-2.c b/gcc/testsuite/gcc.target/i386/pr90765-2.c
new file mode 100644
index 00000000000..45cf1f03747
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr90765-2.c
@@ -0,0 +1,18 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx512f" } */
+/* { dg-final { scan-assembler "and\[lq\]?\[\\t \]*\\$-64,\[\\t \]*%\[re\]?sp" } } */
+/* { dg-skip-if "" { x86_64-*-mingw* } } */
+
+typedef int __v16si __attribute__ ((__vector_size__ (64)));
+
+extern void foo (__v16si, __v16si, __v16si, __v16si, __v16si, __v16si,
+ __v16si, __v16si, __v16si, int, int, int, int, int,
+ int, __v16si *);
+
+extern __v16si x, y;
+
+void
+bar (void)
+{
+ foo (x, x, x, x, x, x, x, x, x, 0, 1, 2, 3, 4, 5, &y);
+}
--
2.20.1
