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[AArch64] Optimize epilogue in the presence of an outgoing args area. 

From-SVN: r212976
This commit is contained in:
Jiong Wang 2014-07-24 10:58:28 +00:00 committed by Marcus Shawcroft
parent 8ae9698d08
commit 8f454e9f8a
4 changed files with 21 additions and 17 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-07-24 Jiong Wang <jiong.wang@arm.com>
* config/aarch64/aarch64.c (aarch64_expand_epilogue): Don't
subtract outgoing area size when restoring stack_pointer_rtx.
2014-07-24 Nick Clifton <nickc@redhat.com>
* config/rx/rx.md (stack_push): Adjust RTL to account for the fact

24
gcc/config/aarch64/aarch64.c
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@ -2363,7 +2363,8 @@ aarch64_expand_epilogue (bool for_sibcall)
{
insn = emit_insn (gen_add3_insn (stack_pointer_rtx,
hard_frame_pointer_rtx,
GEN_INT (- fp_offset)));
GEN_INT (0)));
offset = offset - fp_offset;
RTX_FRAME_RELATED_P (insn) = 1;
/* As SP is set to (FP - fp_offset), according to the rules in
dwarf2cfi.c:dwarf2out_frame_debug_expr, CFA should be calculated
@ -2371,27 +2372,16 @@ aarch64_expand_epilogue (bool for_sibcall)
cfa_reg = stack_pointer_rtx;
}
aarch64_restore_callee_saves (DFmode, fp_offset, V0_REGNUM, V31_REGNUM);
aarch64_restore_callee_saves (DFmode, frame_pointer_needed ? 0 : fp_offset,
V0_REGNUM, V31_REGNUM);
if (offset > 0)
{
if (frame_pointer_needed)
{
if (fp_offset)
{
aarch64_restore_callee_saves (DImode, fp_offset, R0_REGNUM,
R30_REGNUM);
insn = emit_insn (gen_add2_insn (stack_pointer_rtx,
GEN_INT (offset)));
RTX_FRAME_RELATED_P (insn) = 1;
}
else
{
aarch64_restore_callee_saves (DImode, fp_offset, R0_REGNUM,
R28_REGNUM);
aarch64_popwb_pair_reg (DImode, R29_REGNUM, R30_REGNUM, offset,
cfa_reg);
}
aarch64_restore_callee_saves (DImode, 0, R0_REGNUM, R28_REGNUM);
aarch64_popwb_pair_reg (DImode, R29_REGNUM, R30_REGNUM, offset,
cfa_reg);
}
else
{

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2014-07-24 Jiong Wang <jiong.wang@arm.com>
* gcc.target/aarch64/test_frame_12.c: Match optimized instruction
sequences.
2014-07-24 Marek Polacek <polacek@redhat.com>
PR c/57653

4
gcc/testsuite/gcc.target/aarch64/test_frame_12.c
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@ -12,4 +12,8 @@ t_frame_pattern_outgoing (test12, 400, , 8, a[8])
t_frame_run (test12)
/* { dg-final { scan-assembler-times "sub\tsp, sp, #\[0-9\]+" 1 } } */
/* Check epilogue using write-back. */
/* { dg-final { scan-assembler-times "ldp\tx29, x30, \\\[sp\\\], \[0-9\]+" 3 } } */
/* { dg-final { cleanup-saved-temps } } */