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* [gcc r14-3819] LoongArch: Slightly simplify loongarch_block_move_straight
@ 2023-09-09 6:36 Xi Ruoyao
0 siblings, 0 replies; only message in thread
From: Xi Ruoyao @ 2023-09-09 6:36 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:c0bb7a6f39e58717d34c9459586c0b1d5db16d89
commit r14-3819-gc0bb7a6f39e58717d34c9459586c0b1d5db16d89
Author: Xi Ruoyao <xry111@xry111.site>
Date: Fri Sep 8 00:29:57 2023 +0800
LoongArch: Slightly simplify loongarch_block_move_straight
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.
Diff:
---
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 509ef2b97f1c..845fad5a8e8b 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);
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