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llvm-project/llvm/test/Transforms/InstCombine/memcpy-to-load.ll

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Remove sometimes faulty rewrite of memcpy in instcombine. Summary: Solves PR 31990. The bad rewrite could replace a memcpy of one word with store i4 -1 while it should actually be store i8 -1 Hopefully opt and llc has improved enough so the original optimization done by the code isn't needed anymore. One already existing testcase is affected. It originally tested that the memcpy was replaced with load double but since we now remove that rewrite it will be load i64 instead. Patch suggestion by Eli Friedman. Reviewers: eli.friedman, majnemer, efriedma Reviewed By: efriedma Subscribers: efriedma, llvm-commits Differential Revision: https://reviews.llvm.org/D30254 llvm-svn: 296585
2017-03-01 14:45:20 +08:00
; RUN: opt < %s -instcombine -S | FileCheck %s
[InstCombine] regenerate test checks; NFC llvm-svn: 310603
2017-08-10 23:07:37 +08:00
Turn a memcpy from a double* into a load/store of double instead of a load/store of i64. The later prevents promotion/scalarrepl of the source and dest in many cases. This fixes the 300% performance regression of the byval stuff on stepanov_v1p2. llvm-svn: 45945
2008-01-14 08:28:35 +08:00
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i686-apple-darwin8"
[InstCombine] regenerate test checks; NFC llvm-svn: 310603
2017-08-10 23:07:37 +08:00
; Make sure that the memcpy has been replaced with a load/store of i64.
define void @foo(i8* %d, i8* %s) {
; CHECK-LABEL: @foo(
; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* %s to i64*
; CHECK-NEXT: [[TMP2:%.*]] = bitcast i8* %d to i64*
; CHECK-NEXT: [[TMP3:%.*]] = load i64, i64* [[TMP1]], align 1
; CHECK-NEXT: store i64 [[TMP3]], i64* [[TMP2]], align 1
; CHECK-NEXT: ret void
;
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %d, i8* %s, i32 8, i32 1, i1 false)
rip out a ton of intrinsic modernization logic from AutoUpgrade.cpp, which is for pre-2.9 bitcode files. We keep x86 unaligned loads, movnt, crc32, and the target indep prefetch change. As usual, updating the testsuite is a PITA. llvm-svn: 133337
2011-06-18 14:05:24 +08:00
ret void
Turn a memcpy from a double* into a load/store of double instead of a load/store of i64. The later prevents promotion/scalarrepl of the source and dest in many cases. This fixes the 300% performance regression of the byval stuff on stepanov_v1p2. llvm-svn: 45945
2008-01-14 08:28:35 +08:00
}
Revert "Change memcpy/memset/memmove to have dest and source alignments." This reverts commit r253511. This likely broke the bots in http://lab.llvm.org:8011/builders/clang-ppc64-elf-linux2/builds/20202 http://bb.pgr.jp/builders/clang-3stage-i686-linux/builds/3787 llvm-svn: 253543
2015-11-19 13:56:52 +08:00
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind