From: Robert Suchanek <robert.sucha...@imgtec.com>
Cherry-picked 4194c529fade9b3106d118cac63b71bc8b13f7be
from https://github.com/MIPS/gcc
Signed-off-by: Robert Suchanek <robert.sucha...@imgtec.com>
Signed-off-by: Faraz Shahbazker <fshahbaz...@wavecomp.com>
Signed-off-by: Aleksandar Rakic <aleksandar.ra...@htecgroup.com>
---
gcc/config/mips/mips.cc | 8 +++++++-
gcc/config/mips/mips.h | 5 +++++
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/gcc/config/mips/mips.cc b/gcc/config/mips/mips.cc
index 3185fa9633e..cd4bce71ae8 100644
--- a/gcc/config/mips/mips.cc
+++ b/gcc/config/mips/mips.cc
@@ -9631,7 +9631,13 @@ mips_expand_block_move (rtx dest, rtx src, rtx length,
rtx alignment)
{
if (ISA_HAS_COPY)
return mips16_expand_copy (dest, src, length, alignment);
- else if (INTVAL (length) <= MIPS_MAX_MOVE_BYTES_PER_LOOP_ITER)
+ else if (INTVAL (length) <= MIPS_MAX_MOVE_BYTES_PER_LOOP_ITER
+ /* We increase slightly the maximum number of bytes in
+ a straight-line block if the source and destination
+ are aligned to the register width. */
+ || (!optimize_size
+ && INTVAL (alignment) == UNITS_PER_WORD
+ && INTVAL (length) <= MIPS_MAX_MOVE_MEM_STRAIGHT))
{
mips_block_move_straight (dest, src, INTVAL (length),
INTVAL (alignment));
diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index efd23a262f9..0245287f9bf 100644
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -3171,6 +3171,11 @@ while (0)
#define MIPS_MAX_MOVE_BYTES_STRAIGHT \
(MIPS_MAX_MOVE_BYTES_PER_LOOP_ITER * 2)
+/* The maximum number of bytes that can be copied by any expanded block move;
+ see mips_expand_block_move. */
+#define MIPS_MAX_MOVE_MEM_STRAIGHT \
+ (MIPS_MAX_MOVE_BYTES_PER_LOOP_ITER * 3)
+
/* The base cost of a memcpy call, for MOVE_RATIO and friends. These
values were determined experimentally by benchmarking with CSiBE.
In theory, the call overhead is higher for TARGET_ABICALLS (especially
--
2.34.1
