gcc/ChangeLog:
* config/loongarch/loongarch.cc (loongarch_block_move_straight):
Check precondition (delta must be a power of 2) and use
popcount_hwi instead of a homebrew loop.
---
I've not run a full bootstrap with this, but it should be obvious.
Ok for trunk?
gcc/config/loongarch/loongarch.cc | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/gcc/config/loongarch/loongarch.cc
b/gcc/config/loongarch/loongarch.cc
index 509ef2b97f1..845fad5a8e8 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -5225,9 +5225,8 @@ loongarch_block_move_straight (rtx dest, rtx src,
HOST_WIDE_INT length,
emit two ld.d/st.d pairs, one ld.w/st.w pair, and one ld.b/st.b
pair. For each load/store pair we use a dedicated register to keep
the pipeline as populated as possible. */
- HOST_WIDE_INT num_reg = length / delta;
- for (delta_cur = delta / 2; delta_cur != 0; delta_cur /= 2)
- num_reg += !!(length & delta_cur);
+ gcc_assert (pow2p_hwi (delta));
+ HOST_WIDE_INT num_reg = length / delta + popcount_hwi (length % delta);
/* Allocate a buffer for the temporary registers. */
regs = XALLOCAVEC (rtx, num_reg);
--
2.42.0
