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[MemCpyOpt] Allow variable lengths in memcpy optimizer This makes the memcpy-memcpy and memcpy-memset optimizations work for variable sizes as long as they are equal, relaxing the old restriction that they are constant integers. If they're not equal, the old requirement that they are constant integers with certain size restrictions is used. The implementation works by pushing the length tests further down in the code, which reveals some places where it's enough that the lengths are equal (but not necessarily constant). Differential Revision: https://reviews.llvm.org/D100870
2021-04-22 04:48:28 +08:00
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
[MemCpyOpt] Remove MemDepAnalysis-based implementation The MemorySSA-based implementation has been enabled for a few months (since D94376). This patch drops the old MDA-based implementation entirely. I've kept this to only the basic cleanup of dropping various conditions -- the code could be further cleaned up now that there is only one implementation. Differential Revision: https://reviews.llvm.org/D102113
2021-05-09 02:39:54 +08:00
; RUN: opt < %s -memcpyopt -S -verify-memoryssa | FileCheck %s
[MemCpyOpt] Allow variable lengths in memcpy optimizer This makes the memcpy-memcpy and memcpy-memset optimizations work for variable sizes as long as they are equal, relaxing the old restriction that they are constant integers. If they're not equal, the old requirement that they are constant integers with certain size restrictions is used. The implementation works by pushing the length tests further down in the code, which reveals some places where it's enough that the lengths are equal (but not necessarily constant). Differential Revision: https://reviews.llvm.org/D100870
2021-04-22 04:48:28 +08:00
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define void @test(i64 %size) {
; CHECK-LABEL: @test(
; CHECK-NEXT: [[SRC:%.*]] = alloca i8, i64 [[SIZE:%.*]], align 1
; CHECK-NEXT: [[DST:%.*]] = alloca i8, i64 [[SIZE]], align 1
; CHECK-NEXT: ret void
;
%src = alloca i8, i64 %size
%dst = alloca i8, i64 %size
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %src, i64 %size, i1 false)
ret void
}
define void @test2(i64 %size1, i64 %size2, i64 %cpy_size) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: [[SRC:%.*]] = alloca i8, i64 [[SIZE1:%.*]], align 1
; CHECK-NEXT: [[DST:%.*]] = alloca i8, i64 [[SIZE2:%.*]], align 1
; CHECK-NEXT: ret void
;
%src = alloca i8, i64 %size1
%dst = alloca i8, i64 %size2
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %src, i64 %cpy_size, i1 false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i1)