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| author | Chung-Ju Wu <jasonwucj@gmail.com> | 2014-09-03 09:04:46 +0000 |
|---|---|---|
| committer | Chung-Ju Wu <jasonwucj@gcc.gnu.org> | 2014-09-03 09:04:46 +0000 |
| commit | 2da1e7c02214850d6b49a1f63c29fe6ccb7118a9 (patch) | |
| tree | bc60ff7ca0482a432a6147cfc074d8038b2a1e98 /gcc/config/nds32/nds32.md | |
| parent | 6f3d3f9c7c6db3468b8d0269bbca946df2c48d5f (diff) | |
| download | gcc-2da1e7c02214850d6b49a1f63c29fe6ccb7118a9.zip gcc-2da1e7c02214850d6b49a1f63c29fe6ccb7118a9.tar.gz gcc-2da1e7c02214850d6b49a1f63c29fe6ccb7118a9.tar.bz2 | |
[NDS32] We need to make sure it is NOT a variadic function so that some v3push/v3pop preparation can be applied.
-- The rationale of such avoidance is that the 'pop25' instruction also
contains return behavior and we have no chance to further adjust stack
pointer before returning to caller, which is very important to
variadic function.
-- So we do not setup v3push/v3pop (push25/pop25) information for a
variadic function. It will use normal stack push/pop instead.
* config/nds32/nds32.c (nds32_compute_stack_frame): Do not use
v3push/v3pop for variadic function.
* config/nds32/nds32.md (prologue, epilogue): Likewise.
From-SVN: r214857
Diffstat (limited to 'gcc/config/nds32/nds32.md')
| -rw-r--r-- | gcc/config/nds32/nds32.md | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/gcc/config/nds32/nds32.md b/gcc/config/nds32/nds32.md index ccf33d9..18d6d1b 100644 --- a/gcc/config/nds32/nds32.md +++ b/gcc/config/nds32/nds32.md @@ -1971,8 +1971,12 @@ create_template: (define_expand "prologue" [(const_int 0)] "" { - /* Note that only under V3/V3M ISA, we could use v3push prologue. */ - if (TARGET_V3PUSH) + /* Note that only under V3/V3M ISA, we could use v3push prologue. + In addition, we do not want to use v3push for isr function + and variadic function. */ + if (TARGET_V3PUSH + && !nds32_isr_function_p (current_function_decl) + && (cfun->machine->va_args_size == 0)) nds32_expand_prologue_v3push (); else nds32_expand_prologue (); @@ -1982,8 +1986,12 @@ create_template: (define_expand "epilogue" [(const_int 0)] "" { - /* Note that only under V3/V3M ISA, we could use v3pop epilogue. */ - if (TARGET_V3PUSH) + /* Note that only under V3/V3M ISA, we could use v3pop epilogue. + In addition, we do not want to use v3pop for isr function + and variadic function. */ + if (TARGET_V3PUSH + && !nds32_isr_function_p (current_function_decl) + && (cfun->machine->va_args_size == 0)) nds32_expand_epilogue_v3pop (); else nds32_expand_epilogue (); |