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llvm-project/llvm/test/Transforms/MemCpyOpt/variable-sized-memcpy-memcp...

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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
; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=0 | FileCheck %s
; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=1 -verify-memoryssa | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
define void @test(i8* %src, i64 %size) {
; CHECK-LABEL: @test(
; CHECK-NEXT: [[TMP:%.*]] = alloca i8, i64 [[SIZE:%.*]], align 1
; CHECK-NEXT: [[DST:%.*]] = alloca i8, i64 [[SIZE]], align 1
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 [[TMP]], i8* align 8 [[SRC:%.*]], i64 [[SIZE]], i1 false)
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 [[DST]], i8* align 8 [[SRC]], i64 [[SIZE]], i1 false)
; CHECK-NEXT: ret void
;
%tmp = alloca i8, i64 %size
%dst = alloca i8, i64 %size
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %tmp, i8* align 8 %src, i64 %size, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %tmp, i64 %size, i1 false)
ret void
}
; Differing sizes, so left as it is.
define void @negative_test(i8* %src, i64 %size1, i64 %size2) {
; CHECK-LABEL: @negative_test(
; CHECK-NEXT: [[TMP:%.*]] = alloca i8, i64 [[SIZE1:%.*]], align 1
; CHECK-NEXT: [[DST:%.*]] = alloca i8, i64 [[SIZE2:%.*]], align 1
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 [[TMP]], i8* align 8 [[SRC:%.*]], i64 [[SIZE1]], i1 false)
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 [[DST]], i8* align 8 [[TMP]], i64 [[SIZE2]], i1 false)
; CHECK-NEXT: ret void
;
%tmp = alloca i8, i64 %size1
%dst = alloca i8, i64 %size2
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %tmp, i8* align 8 %src, i64 %size1, i1 false)
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %tmp, i64 %size2, i1 false)
ret void
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i1)