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author | Robert Dewar <dewar@adacore.com> | 2007-09-26 12:42:59 +0200 |
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committer | Arnaud Charlet <charlet@gcc.gnu.org> | 2007-09-26 12:42:59 +0200 |
commit | f23585f174e491dcf8fbb274a0e407cc2cc64886 (patch) | |
tree | 9f6affc91257fbbff74071b18fe45d81fa90834e | |
parent | fdce4bb79eb092b412c272e92435b57147312011 (diff) | |
download | gcc-f23585f174e491dcf8fbb274a0e407cc2cc64886.zip gcc-f23585f174e491dcf8fbb274a0e407cc2cc64886.tar.gz gcc-f23585f174e491dcf8fbb274a0e407cc2cc64886.tar.bz2 |
exp_ch5.adb: Activate memmove type processing if debug flag d.s is set
2007-09-26 Robert Dewar <dewar@adacore.com>
* exp_ch5.adb: Activate memmove type processing if debug flag d.s is set
* debug.adb: Add d.s flag.
From-SVN: r128787
-rw-r--r-- | gcc/ada/debug.adb | 7 | ||||
-rw-r--r-- | gcc/ada/exp_ch5.adb | 15 |
2 files changed, 17 insertions, 5 deletions
diff --git a/gcc/ada/debug.adb b/gcc/ada/debug.adb index 8b3ff39..363cc07 100644 --- a/gcc/ada/debug.adb +++ b/gcc/ada/debug.adb @@ -111,7 +111,7 @@ package body Debug is -- d.p -- d.q -- d.r - -- d.s + -- d.s Disable expansion of slice move, use memmove -- d.t Disable static allocation of library level dispatch tables -- d.u -- d.v @@ -514,6 +514,11 @@ package body Debug is -- main source (this corresponds to a previous behavior of -gnatl and -- is used for running the ACATS tests). + -- d.s Normally the compiler expands slice moves into loops if overlap + -- might be possible. This debug flag inhibits that expansion, and + -- the back end is expected to use an appropriate routine to handle + -- overlap, based on Forward_OK and Backwards_OK flags. + -- d.t The compiler has been modified (a fairly extensive modification) -- to generate static dispatch tables for library level tagged types. -- This debug switch disables this modification and reverts to the diff --git a/gcc/ada/exp_ch5.adb b/gcc/ada/exp_ch5.adb index c68a12a..4de1074 100644 --- a/gcc/ada/exp_ch5.adb +++ b/gcc/ada/exp_ch5.adb @@ -387,7 +387,7 @@ package body Exp_Ch5 is -- File.Storage := Contents; -- end Write_All; - -- We expand to a loop in either of these two cases. + -- We expand to a loop in either of these two cases -- Question for future thought. Another potentially more efficient -- approach would be to create the actual subtype, and then do an @@ -636,11 +636,18 @@ package body Exp_Ch5 is -- gigi handle it. if not Loop_Required then + + -- Assume gigi can handle it if Forwards_OK is set + if Forwards_OK (N) then return; - else - null; - -- Here is where a memmove would be appropriate ??? + + -- If Forwards_OK is not set, the back end will need something + -- like memmove to handle the move. For now, this processing is + -- activated using the .s debug flag (-gnatd.s). + + elsif Debug_Flag_Dot_S then + return; end if; end if; |