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exp_ch5.adb (Expand_Assign_Array): For the GCC back-end, do not generate an assignment loop in case of overlap.

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2009-04-16  Eric Botcazou  <ebotcazou@adacore.com>

	* exp_ch5.adb (Expand_Assign_Array): For the GCC back-end, do not
	generate an assignment loop in case of overlap.

From-SVN: r146150
This commit is contained in:
Eric Botcazou 2009-04-16 08:43:32 +00:00 committed by Arnaud Charlet
parent b2ed7a03e2
commit 014caddba6
2 changed files with 16 additions and 6 deletions
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5
gcc/ada/ChangeLog
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@ -1,3 +1,8 @@
2009-04-16 Eric Botcazou <ebotcazou@adacore.com>
* exp_ch5.adb (Expand_Assign_Array): For the GCC back-end, do not
generate an assignment loop in case of overlap.
2009-04-16 Olivier Hainque <hainque@adacore.com> 2009-04-16 Olivier Hainque <hainque@adacore.com>
* gnat_ugn.texi (gnatmem description): Make it explicit that * gnat_ugn.texi (gnatmem description): Make it explicit that

17
gcc/ada/exp_ch5.adb
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@ -634,16 +634,21 @@ package body Exp_Ch5 is
end if; end if;
end if; end if;
-- If after that analysis, Forwards_OK is still True, and -- If after that analysis Loop_Required is False, meaning that we
-- Loop_Required is False, meaning that we have not discovered some -- have not discovered some non-overlap reason for requiring a loop,
-- non-overlap reason for requiring a loop, then we can still let -- then the outcome depends on the capabilities of the back end.
-- gigi handle it.
if not Loop_Required then if not Loop_Required then
-- Assume gigi can handle it if Forwards_OK is set -- The GCC back end can deal with all cases of overlap by falling
-- back to memmove if it cannot use a more efficient approach.
if Forwards_OK (N) then if VM_Target = No_VM and not AAMP_On_Target then
return;
-- Assume other back ends can handle it if Forwards_OK is set
elsif Forwards_OK (N) then
return; return;
-- If Forwards_OK is not set, the back end will need something -- If Forwards_OK is not set, the back end will need something