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[PATCH 5/9] Modify ix86_save_reg to optionally omit stub-managed registers
- From: Daniel Santos <daniel dot santos at pobox dot com>
- To: gcc-patches <gcc-patches at gcc dot gnu dot org>
- Cc: Daniel Santos <daniel dot santos at pobox dot com>
- Date: Tue, 22 Nov 2016 23:19:14 -0600
- Subject: [PATCH 5/9] Modify ix86_save_reg to optionally omit stub-managed registers
- Authentication-results: sourceware.org; auth=none
- References: <25abd41b-923b-2fea-dfc3-9051af632f44@pobox.com>
Adds static HARD_REG_SET stub_managed_regs to track registers that will
be managed by the pro/epilogue stubs for the function.
Adds a third parameter bool ignore_outlined to ix86_save_reg to specify
rather or not the count should include registers marked in
stub_managed_regs.
---
gcc/config/i386/i386.c | 31 ++++++++++++++++++++-----------
1 file changed, 20 insertions(+), 11 deletions(-)
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 40f9acf..f661b3f 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -12294,10 +12294,14 @@ ix86_hard_regno_scratch_ok (unsigned int regno)
&& df_regs_ever_live_p (regno)));
}
+/* Registers who's save & restore will be managed by stubs called from
+ pro/epilogue (inited in ix86_compute_frame_layout). */
+static HARD_REG_SET GTY(()) stub_managed_regs;
+
/* Return TRUE if we need to save REGNO. */
static bool
-ix86_save_reg (unsigned int regno, bool maybe_eh_return)
+ix86_save_reg (unsigned int regno, bool maybe_eh_return, bool ignore_outlined)
{
/* If there are no caller-saved registers, we preserve all registers,
except for MMX and x87 registers which aren't supported when saving
@@ -12365,6 +12369,10 @@ ix86_save_reg (unsigned int regno, bool maybe_eh_return)
}
}
+ if (ignore_outlined && cfun->machine->outline_ms_sysv
+ && in_hard_reg_set_p (stub_managed_regs, DImode, regno))
+ return false;
+
if (crtl->drap_reg
&& regno == REGNO (crtl->drap_reg)
&& !cfun->machine->no_drap_save_restore)
@@ -12385,7 +12393,7 @@ ix86_nsaved_regs (void)
int regno;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
- if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, true))
+ if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, true, false))
nregs ++;
return nregs;
}
@@ -12401,7 +12409,7 @@ ix86_nsaved_sseregs (void)
if (!TARGET_64BIT_MS_ABI)
return 0;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
- if (SSE_REGNO_P (regno) && ix86_save_reg (regno, true))
+ if (SSE_REGNO_P (regno) && ix86_save_reg (regno, true, false))
nregs ++;
return nregs;
}
@@ -12481,6 +12489,7 @@ ix86_compute_frame_layout (struct ix86_frame *frame)
frame->nregs = ix86_nsaved_regs ();
frame->nsseregs = ix86_nsaved_sseregs ();
+ CLEAR_HARD_REG_SET (stub_managed_regs);
/* 64-bit MS ABI seem to require stack alignment to be always 16,
except for function prologues, leaf functions and when the defult
@@ -12792,7 +12801,7 @@ ix86_emit_save_regs (void)
rtx_insn *insn;
for (regno = FIRST_PSEUDO_REGISTER - 1; regno-- > 0; )
- if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, true))
+ if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, true, true))
{
insn = emit_insn (gen_push (gen_rtx_REG (word_mode, regno)));
RTX_FRAME_RELATED_P (insn) = 1;
@@ -12874,7 +12883,7 @@ ix86_emit_save_regs_using_mov (HOST_WIDE_INT cfa_offset)
unsigned int regno;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
- if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, true))
+ if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, true, true))
{
ix86_emit_save_reg_using_mov (word_mode, regno, cfa_offset);
cfa_offset -= UNITS_PER_WORD;
@@ -12889,7 +12898,7 @@ ix86_emit_save_sse_regs_using_mov (HOST_WIDE_INT cfa_offset)
unsigned int regno;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
- if (SSE_REGNO_P (regno) && ix86_save_reg (regno, true))
+ if (SSE_REGNO_P (regno) && ix86_save_reg (regno, true, true))
{
ix86_emit_save_reg_using_mov (V4SFmode, regno, cfa_offset);
cfa_offset -= GET_MODE_SIZE (V4SFmode);
@@ -13269,13 +13278,13 @@ get_scratch_register_on_entry (struct scratch_reg *sr)
&& !static_chain_p
&& drap_regno != CX_REG)
regno = CX_REG;
- else if (ix86_save_reg (BX_REG, true))
+ else if (ix86_save_reg (BX_REG, true, false))
regno = BX_REG;
/* esi is the static chain register. */
else if (!(regparm == 3 && static_chain_p)
- && ix86_save_reg (SI_REG, true))
+ && ix86_save_reg (SI_REG, true, false))
regno = SI_REG;
- else if (ix86_save_reg (DI_REG, true))
+ else if (ix86_save_reg (DI_REG, true, false))
regno = DI_REG;
else
{
@@ -14376,7 +14385,7 @@ ix86_emit_restore_regs_using_mov (HOST_WIDE_INT cfa_offset,
unsigned int regno;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
- if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, maybe_eh_return))
+ if (GENERAL_REGNO_P (regno) && ix86_save_reg (regno, maybe_eh_return, true))
{
rtx reg = gen_rtx_REG (word_mode, regno);
rtx mem;
@@ -14415,7 +14424,7 @@ ix86_emit_restore_sse_regs_using_mov (HOST_WIDE_INT cfa_offset,
unsigned int regno;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
- if (SSE_REGNO_P (regno) && ix86_save_reg (regno, maybe_eh_return))
+ if (SSE_REGNO_P (regno) && ix86_save_reg (regno, maybe_eh_return, true))
{
rtx reg = gen_rtx_REG (V4SFmode, regno);
rtx mem;
--
2.9.0