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| author | Kevin Ryde <user42@zip.com.au> | 2003-10-24 22:11:38 +0200 |
|---|---|---|
| committer | Kevin Ryde <user42@zip.com.au> | 2003-10-24 22:11:38 +0200 |
| commit | f0929cf19c03e4cb976fcba57f73e187a5234652 (patch) | |
| tree | 418fc33066d93c468e0f355958c75a2adacb3573 /mpn/m68k | |
| parent | d7decdf6ba9bceba470a48e266e4784b7e07256b (diff) | |
| download | gmp-f0929cf19c03e4cb976fcba57f73e187a5234652.tar.gz | |
* mpn/m68k/lshift.asm, mpn/m68k/lshift.asm: Support 16-bit int and
stack alignment.
Diffstat (limited to 'mpn/m68k')
| -rw-r--r-- | mpn/m68k/rshift.asm | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/mpn/m68k/rshift.asm b/mpn/m68k/rshift.asm index 12546db43..c3243f50f 100644 --- a/mpn/m68k/rshift.asm +++ b/mpn/m68k/rshift.asm @@ -1,6 +1,7 @@ dnl mc68020 mpn_rshift -- mpn right shift. -dnl Copyright 1996, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. +dnl Copyright 1996, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, +dnl Inc. dnl dnl This file is part of the GNU MP Library. dnl @@ -27,6 +28,16 @@ C shift==1 shift>1 C 68040: 9 12 +C mp_limb_t mpn_rshift (mp_ptr res_ptr, mp_srcptr s_ptr, mp_size_t s_size, +C unsigned cnt); +C +C The "cnt" parameter is either 16 bits or 32 bits depending on +C SIZEOF_UNSIGNED (see ABI notes in mpn/m68k/README). The value is of +C course only 1 to 31. When loaded as 16 bits there's garbage in the upper +C half, hence the use of cmpw. The shift instructions take the their count +C modulo 64, so the upper part doesn't matter to them either. +C + C INPUT PARAMETERS C res_ptr (sp + 4) C s_ptr (sp + 8) @@ -38,6 +49,10 @@ define(s_ptr, `a0') define(s_size, `d6') define(cnt, `d4') +ifdef(`SIZEOF_UNSIGNED',, +`m4_error(`SIZEOF_UNSIGNED not defined, should be in config.m4 +')') + PROLOGUE(mpn_rshift) C Save used registers on the stack. moveml d2-d6/a2, M(-,sp) @@ -46,10 +61,12 @@ C Copy the arguments to registers. movel M(sp,28), res_ptr movel M(sp,32), s_ptr movel M(sp,36), s_size - movel M(sp,40), cnt +ifelse(SIZEOF_UNSIGNED,2, +` movew M(sp,40), cnt', +` movel M(sp,40), cnt') moveql #1, d5 - cmpl d5, cnt + cmpw d5, cnt bne L(Lnormal) cmpl res_ptr, s_ptr bls L(Lspecial) C jump if res_ptr >= s_ptr |