I found another thing, I don't understand (or I suspect to be not ok)
( see also the 0 initialization by -gt as indicated in the other mail /
below)
First method in buttons.pp
.section .text.n_buttons_getlcldefaultbtnglyph$tbitbtnkind$$tgraphic
.balign 16,0x90
.balign 16,0x90
.globl BUTTONS_GETLCLDEFAULTBTNGLYPH$TBITBTNKIND$$TGRAPHIC
BUTTONS_GETLCLDEFAULTBTNGLYPH$TBITBTNKIND$$TGRAPHIC:
.Lc1:
# Temps allocated between esp+0 and esp+0
# Var Kind located in register eax
# Var $result located in register eax
# [buttons.pp]
# [452] begin
.Ll1:
movl $0,%edx
.Ll2:
# [453] Result := GetDefaultButtonIcon(BitBtnImages[Kind]);
movl TC_BUTTONS_BITBTNIMAGES(,%eax,4),%eax
call BUTTONS_GETDEFAULTBUTTONICON$LONGINT$$TCUSTOMBITMAP
.Ll3:
# [454] end;
ret
The code is identical between with/withou -gt => except for :
movl $0,%edx
which is inserted by -gt
But edx isn't used at all (the call returns it's result in eax)?
So why trashing it, and why with 0?
Martin
On 07/06/2010 17:44, Martin wrote:
On 06/06/2010 20:44, Martin wrote:
On 05/06/2010 19:57, Jonas Maebe wrote:
One thing that was added is the node level CSE optimiser. You can
disable it with the -Oonocse command line option (put it in the
command line after -O2). There are no changes to -gt that I remember.
Comparing the assembler of the same file with and without -gt I noted
soemthing else, I am not sure about
local vars are:
GlyphValid, Handled: Boolean;
CustomGlyph: TGraphic;
BitmapHandle, MaskHandle: HBitmap;
As expected the begin of the method is equal, I only copied it for
completeness
.section .text.n_buttons_tcustombitbtn_$__realizekind
.balign 16,0x90
.balign 16,0x90
.globl BUTTONS_TCUSTOMBITBTN_$__REALIZEKIND
BUTTONS_TCUSTOMBITBTN_$__REALIZEKIND:
.Lc82:
# Temps allocated between ebp-76 and ebp-12
# path: .\include\
# file: bitbtn.inc
# indx: 2
.Ll204:
# [184] begin
pushl %ebp
.Lc84:
.Lc85:
movl %esp,%ebp
.Lc86:
subl $76,%esp
# Var $self located in register eax
# Var GlyphValid located in register al
# Var CustomGlyph located in register esi
movl %ebx,-76(%ebp)
movl %esi,-72(%ebp)
movl %edi,-68(%ebp)
# Var Handled located at ebp-4
# Var BitmapHandle located at ebp-8
# Var MaskHandle located at ebp-12
movl %eax,-60(%ebp)
# ============================= here starts the difference
# here is the trashing of locals
.Ll205:
movb $85,-64(%ebp)
movb $85,-4(%ebp)
movl $0,%esi # <<<<<<<<<<<<<<<<<<<
movl $1431655765,-8(%ebp)
movl $1431655765,-12(%ebp)
The line I marked trashes " CustomGlyph: TGraphic"
Other objects are trashed with 1431655765 , but this one is trashed
with $0 ? (that isn't really trash?)
Martin
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