f5446b769a
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
33 lines
1.1 KiB
LLVM
33 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=0 | FileCheck %s
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; RUN: opt < %s -memcpyopt -S -enable-memcpyopt-memoryssa=1 -verify-memoryssa | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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define void @test(i64 %size) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: [[SRC:%.*]] = alloca i8, i64 [[SIZE:%.*]], align 1
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; CHECK-NEXT: [[DST:%.*]] = alloca i8, i64 [[SIZE]], align 1
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; CHECK-NEXT: ret void
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;
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%src = alloca i8, i64 %size
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%dst = alloca i8, i64 %size
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %src, i64 %size, i1 false)
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ret void
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}
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define void @test2(i64 %size1, i64 %size2, i64 %cpy_size) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[SRC:%.*]] = alloca i8, i64 [[SIZE1:%.*]], align 1
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; CHECK-NEXT: [[DST:%.*]] = alloca i8, i64 [[SIZE2:%.*]], align 1
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; CHECK-NEXT: ret void
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;
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%src = alloca i8, i64 %size1
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%dst = alloca i8, i64 %size2
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %src, i64 %cpy_size, i1 false)
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ret void
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}
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i1)
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