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File _service:tar_scm:LoongArch-Slightly-simplify-loongarch_block_move_str.patch of Package gcc
From f4a0248c80fedff3a6841407ff95b732dfbb93a1 Mon Sep 17 00:00:00 2001 From: Xi Ruoyao <xry111@xry111.site> Date: Fri, 8 Sep 2023 00:29:57 +0800 Subject: [PATCH 073/124] 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. Signed-off-by: Peng Fan <fanpeng@loongson.cn> Signed-off-by: ticat_fp <fanpeng@loongson.cn> --- 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 baa5c2354..baa9831aa 100644 --- a/gcc/config/loongarch/loongarch.cc +++ b/gcc/config/loongarch/loongarch.cc @@ -5221,9 +5221,8 @@ 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); -- 2.33.0
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