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added a remark about a possible QEMU issue with CMP/CMPI .W and .B on ColdFire

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git-svn-id: trunk@27291 -
This commit is contained in:
Károly Balogh 2014-03-26 17:08:16 +00:00
parent 1af6d17b4d
commit 3b9e2a620b
1 changed files with 6 additions and 2 deletions
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8
compiler/m68k/cgcpu.pas
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@ -1425,8 +1425,12 @@ unit cgcpu;
list.concat(taicpu.op_reg(A_TST,TCGSize2OpSize[size],reg))
else
begin
{ ColdFire also needs S_L for CMPI }
if current_settings.cputype in cpu_coldfire then
{ ColdFire ISA A also needs S_L for CMPI }
{ Note: older QEMU pukes from CMPI sizes <> .L even on ISA B/C, but
it's actually *LEGAL*, see CFPRM, page 4-30, the bug also seems
fixed in recent QEMU, but only when CPU cfv4e is forced, not by
default. (KB) }
if current_settings.cputype in cpu_coldfire{-[cpu_isa_b,cpu_isa_c]} then
begin
sign_extend(list, size, reg);
size:=OS_INT;