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| author | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-08-11 15:51:01 +0000 |
|---|---|---|
| committer | hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4> | 2016-08-11 15:51:01 +0000 |
| commit | 350f354acdd2224797f93a979fff38cb631548a3 (patch) | |
| tree | 6b52fc64727c944242444e0addb30cbb1af05030 /gcc/config | |
| parent | 37b2e7a1c2a753f3210751e1719060a57d3749e7 (diff) | |
| download | gcc-350f354acdd2224797f93a979fff38cb631548a3.tar.gz | |
Use TImode for piecewise move in 64-bit mode
Use TImode for piecewise move in 64-bit mode. We should use TImode in
32-bit mode and use OImode or XImode if they are available. But since
by_pieces_ninsns determines the widest mode with MAX_FIXED_MODE_SIZE,
we can only use TImode in 64-bit mode.
gcc/
* config/i386/i386.h (MOVE_MAX_PIECES): Use TImode in 64-bit
mode if unaligned SSE load and store are optimal.
gcc/testsuite/
* gcc.target/i386/pieces-memcpy-1.c: New test.
* gcc.target/i386/pieces-memcpy-2.c: Likewise.
* gcc.target/i386/pieces-memcpy-3.c: Likewise.
* gcc.target/i386/pieces-memcpy-4.c: Likewise.
* gcc.target/i386/pieces-memcpy-5.c: Likewise.
* gcc.target/i386/pieces-memcpy-6.c: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@239378 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h index 9b662648f7f..8751143a2a6 100644 --- a/gcc/config/i386/i386.h +++ b/gcc/config/i386/i386.h @@ -1950,8 +1950,18 @@ typedef struct ix86_args { /* MOVE_MAX_PIECES is the number of bytes at a time which we can move efficiently, as opposed to MOVE_MAX which is the maximum - number of bytes we can move with a single instruction. */ -#define MOVE_MAX_PIECES UNITS_PER_WORD + number of bytes we can move with a single instruction. + + ??? We should use TImode in 32-bit mode and use OImode or XImode + if they are available. But since by_pieces_ninsns determines the + widest mode with MAX_FIXED_MODE_SIZE, we can only use TImode in + 64-bit mode. */ +#define MOVE_MAX_PIECES \ + ((TARGET_64BIT \ + && TARGET_SSE2 \ + && TARGET_SSE_UNALIGNED_LOAD_OPTIMAL \ + && TARGET_SSE_UNALIGNED_STORE_OPTIMAL) \ + ? GET_MODE_SIZE (TImode) : UNITS_PER_WORD) /* If a memory-to-memory move would take MOVE_RATIO or more simple move-instruction pairs, we will do a movmem or libcall instead. |