forked from OSchip/llvm-project
214 lines
9.4 KiB
LLVM
214 lines
9.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -memcpyopt -S %s | FileCheck %s
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; memset -> memcpy forwarding, if memcpy is larger than memset, but trailing
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; bytes are known to be undef.
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%T = type { i64, i32, i32 }
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define void @test_alloca(i8* %result) {
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; CHECK-LABEL: @test_alloca(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[RESULT:%.*]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 12, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 false)
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ret void
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}
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define void @test_alloca_with_lifetimes(i8* %result) {
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; CHECK-LABEL: @test_alloca_with_lifetimes(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[B]])
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[RESULT:%.*]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* [[B]])
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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call void @llvm.lifetime.start.p0i8(i64 16, i8* %b)
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 12, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 false)
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call void @llvm.lifetime.end.p0i8(i64 16, i8* %b)
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ret void
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}
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define void @test_malloc_with_lifetimes(i8* %result) {
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; CHECK-LABEL: @test_malloc_with_lifetimes(
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; CHECK-NEXT: [[A:%.*]] = call i8* @malloc(i64 16)
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[A]])
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[A]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[RESULT:%.*]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 16, i8* [[A]])
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; CHECK-NEXT: call void @free(i8* [[A]])
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; CHECK-NEXT: ret void
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;
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%a = call i8* @malloc(i64 16)
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call void @llvm.lifetime.start.p0i8(i64 16, i8* %a)
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call void @llvm.memset.p0i8.i64(i8* align 8 %a, i8 0, i64 12, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %a, i64 16, i1 false)
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call void @llvm.lifetime.end.p0i8(i64 16, i8* %a)
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call void @free(i8* %a)
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ret void
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}
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; memcpy size is larger than lifetime, don't optimize.
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define void @test_copy_larger_than_lifetime_size(i8* %result) {
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; CHECK-LABEL: @test_copy_larger_than_lifetime_size(
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; CHECK-NEXT: [[A:%.*]] = call i8* @malloc(i64 16)
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; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 12, i8* [[A]])
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[A]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[RESULT:%.*]], i8* align 8 [[A]], i64 16, i1 false)
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; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 12, i8* [[A]])
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; CHECK-NEXT: call void @free(i8* [[A]])
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; CHECK-NEXT: ret void
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;
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%a = call i8* @malloc(i64 16)
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call void @llvm.lifetime.start.p0i8(i64 12, i8* %a)
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call void @llvm.memset.p0i8.i64(i8* align 8 %a, i8 0, i64 12, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %a, i64 16, i1 false)
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call void @llvm.lifetime.end.p0i8(i64 12, i8* %a)
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call void @free(i8* %a)
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ret void
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}
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; The trailing bytes are not known to be undef, we can't ignore them.
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define void @test_not_undef_memory(i8* %result, i8* %input) {
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; CHECK-LABEL: @test_not_undef_memory(
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[INPUT:%.*]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[RESULT:%.*]], i8* align 8 [[INPUT]], i64 16, i1 false)
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; CHECK-NEXT: ret void
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;
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call void @llvm.memset.p0i8.i64(i8* align 8 %input, i8 0, i64 12, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %input, i64 16, i1 false)
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ret void
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}
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; Memset is volatile, memcpy is not. Can be optimized.
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define void @test_volatile_memset(i8* %result) {
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; CHECK-LABEL: @test_volatile_memset(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 12, i1 true)
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[RESULT:%.*]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 12, i1 true)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 false)
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ret void
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}
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; Memcpy is volatile, memset is not. Cannot be optimized.
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define void @test_volatile_memcpy(i8* %result) {
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; CHECK-LABEL: @test_volatile_memcpy(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[RESULT:%.*]], i8* align 8 [[B]], i64 16, i1 true)
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 12, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 true)
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ret void
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}
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; Write between memset and memcpy, can't optimize.
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define void @test_write_between(i8* %result) {
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; CHECK-LABEL: @test_write_between(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 12, i1 false)
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; CHECK-NEXT: store i8 -1, i8* [[B]]
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[RESULT:%.*]], i8* align 8 [[B]], i64 16, i1 false)
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 12, i1 false)
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store i8 -1, i8* %b
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 false)
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ret void
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}
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; A write prior to the memset, which is part of the memset region.
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; We could optimize this, but currently don't, because the used memory location is imprecise.
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define void @test_write_before_memset_in_memset_region(i8* %result) {
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; CHECK-LABEL: @test_write_before_memset_in_memset_region(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: store i8 -1, i8* [[B]]
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 8, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[RESULT:%.*]], i8* align 8 [[B]], i64 16, i1 false)
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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store i8 -1, i8* %b
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 8, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 false)
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ret void
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}
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; A write prior to the memset, which is part of the memcpy (but not memset) region.
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; This cannot be optimized.
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define void @test_write_before_memset_in_memcpy_region(i8* %result) {
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; CHECK-LABEL: @test_write_before_memset_in_memcpy_region(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: [[C:%.*]] = getelementptr inbounds [[T]], %T* [[A]], i64 0, i32 2
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; CHECK-NEXT: store i32 -1, i32* [[C]]
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 8, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[RESULT:%.*]], i8* align 8 [[B]], i64 16, i1 false)
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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%c = getelementptr inbounds %T, %T* %a, i64 0, i32 2
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store i32 -1, i32* %c
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 8, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 false)
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ret void
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}
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; A write prior to the memset, which is part of both the memset and memcpy regions.
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; This cannot be optimized.
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define void @test_write_before_memset_in_both_regions(i8* %result) {
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; CHECK-LABEL: @test_write_before_memset_in_both_regions(
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; CHECK-NEXT: [[A:%.*]] = alloca [[T:%.*]], align 8
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; CHECK-NEXT: [[B:%.*]] = bitcast %T* [[A]] to i8*
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; CHECK-NEXT: [[C:%.*]] = getelementptr inbounds [[T]], %T* [[A]], i64 0, i32 1
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; CHECK-NEXT: store i32 -1, i32* [[C]]
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[B]], i8 0, i64 10, i1 false)
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[RESULT:%.*]], i8* align 8 [[B]], i64 16, i1 false)
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; CHECK-NEXT: ret void
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;
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%a = alloca %T, align 8
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%b = bitcast %T* %a to i8*
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%c = getelementptr inbounds %T, %T* %a, i64 0, i32 1
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store i32 -1, i32* %c
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call void @llvm.memset.p0i8.i64(i8* align 8 %b, i8 0, i64 10, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %result, i8* align 8 %b, i64 16, i1 false)
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ret void
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}
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declare i8* @malloc(i64)
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declare void @free(i8*)
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1)
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i1)
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
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