From: Xi Ruoyao <xry111@xry111.site>
Date: Thu, 7 Sep 2023 16:29:57 +0000 (+0800)
Subject: LoongArch: Slightly simplify loongarch_block_move_straight
X-Git-Tag: basepoints/gcc-15~6320
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0bb7a6f39e58717d34c9459586c0b1d5db16d89;p=thirdparty%2Fgcc.git

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 --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);