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llvm-project/llvm/test/Transforms/InstCombine/memset-1.ll
Nikita Popov 635f93dff7 [SimplifyLibCalls] Place deref attr even if nonnull already set 
If nonnull is already set, we currently skip setting both nonnull
and dereferenceable. Make these independent, to avoid regressions
when additional nonnull attributes are inferred earlier.
2022-10-04 11:26:15 +02:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; Test that the memset library call simplifier works correctly.
;
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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"
declare ptr @memset(ptr, i32, i32)
declare void @llvm.memset.p0.i32(ptr nocapture writeonly, i8, i32, i32, i1)
declare noalias ptr @malloc(i32) #1
; Check memset(mem1, val, size) -> llvm.memset(mem1, val, size, 1).
define ptr @test_simplify1(ptr %mem, i32 %val, i32 %size) {
; CHECK-LABEL: @test_simplify1(
; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[VAL:%.*]] to i8
; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr align 1 [[MEM:%.*]], i8 [[TMP1]], i32 [[SIZE:%.*]], i1 false)
; CHECK-NEXT: ret ptr [[MEM]]
;
%ret = call ptr @memset(ptr %mem, i32 %val, i32 %size)
ret ptr %ret
}
define ptr @test_simplify1_tail(ptr %mem, i32 %val, i32 %size) {
; CHECK-LABEL: @test_simplify1_tail(
; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[VAL:%.*]] to i8
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr align 1 [[MEM:%.*]], i8 [[TMP1]], i32 [[SIZE:%.*]], i1 false)
; CHECK-NEXT: ret ptr [[MEM]]
;
%ret = tail call ptr @memset(ptr %mem, i32 %val, i32 %size)
ret ptr %ret
}
define ptr @test_simplify1_musttail(ptr %mem, i32 %val, i32 %size) {
; CHECK-LABEL: @test_simplify1_musttail(
; CHECK-NEXT: [[RET:%.*]] = musttail call ptr @memset(ptr [[MEM:%.*]], i32 [[VAL:%.*]], i32 [[SIZE:%.*]])
; CHECK-NEXT: ret ptr [[RET]]
;
%ret = musttail call ptr @memset(ptr %mem, i32 %val, i32 %size)
ret ptr %ret
}
; Malloc + memset pattern is now handled by DSE in a more general way.
define ptr @pr25892_lite(i32 %size) #0 {
; CHECK-LABEL: @pr25892_lite(
; CHECK-NEXT: [[CALL1:%.*]] = call ptr @malloc(i32 [[SIZE:%.*]]) #[[ATTR0:[0-9]+]]
; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr align 1 [[CALL1]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[CALL1]]
;
%call1 = call ptr @malloc(i32 %size) #1
%call2 = call ptr @memset(ptr %call1, i32 0, i32 %size) #1
ret ptr %call2
}
; A memset intrinsic should be handled similarly to a memset() libcall.
; Notice that malloc + memset pattern is now handled by DSE in a more general way.
define ptr @malloc_and_memset_intrinsic(i32 %n) #0 {
; CHECK-LABEL: @malloc_and_memset_intrinsic(
; CHECK-NEXT: [[CALL:%.*]] = call ptr @malloc(i32 [[N:%.*]])
; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr align 1 [[CALL]], i8 0, i32 [[N]], i1 false)
; CHECK-NEXT: ret ptr [[CALL]]
;
%call = call ptr @malloc(i32 %n)
call void @llvm.memset.p0.i32(ptr %call, i8 0, i32 %n, i32 1, i1 false)
ret ptr %call
}
; This should not create a calloc and should not crash the compiler.
; Notice that malloc + memset pattern is now handled by DSE in a more general way.
define ptr @notmalloc_memset(i32 %size, ptr %notmalloc) {
; CHECK-LABEL: @notmalloc_memset(
; CHECK-NEXT: [[CALL1:%.*]] = call ptr [[NOTMALLOC:%.*]](i32 [[SIZE:%.*]]) #[[ATTR0]]
; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr align 1 [[CALL1]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[CALL1]]
;
%call1 = call ptr %notmalloc(i32 %size) #1
%call2 = call ptr @memset(ptr %call1, i32 0, i32 %size) #1
ret ptr %call2
}
; This doesn't fire currently because the malloc has more than one use.
; Notice that malloc + memset pattern is now handled by DSE in a more general way.
define ptr @pr25892(i32 %size) #0 {
; CHECK-LABEL: @pr25892(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CALL:%.*]] = tail call ptr @malloc(i32 [[SIZE:%.*]]) #[[ATTR0]]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq ptr [[CALL]], null
; CHECK-NEXT: br i1 [[CMP]], label [[CLEANUP:%.*]], label [[IF_END:%.*]]
; CHECK: if.end:
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr nonnull align 1 [[CALL]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: br label [[CLEANUP]]
; CHECK: cleanup:
; CHECK-NEXT: [[RETVAL_0:%.*]] = phi ptr [ [[CALL]], [[IF_END]] ], [ null, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret ptr [[RETVAL_0]]
;
entry:
%call = tail call ptr @malloc(i32 %size) #1
%cmp = icmp eq ptr %call, null
br i1 %cmp, label %cleanup, label %if.end
if.end:
%call2 = tail call ptr @memset(ptr nonnull %call, i32 0, i32 %size) #1
br label %cleanup
cleanup:
%retval.0 = phi ptr [ %call, %if.end ], [ null, %entry ]
ret ptr %retval.0
}
; If there's a calloc transform, the store must also be eliminated.
define ptr @buffer_is_modified_then_memset(i32 %size) {
; CHECK-LABEL: @buffer_is_modified_then_memset(
; CHECK-NEXT: [[PTR:%.*]] = tail call ptr @malloc(i32 [[SIZE:%.*]]) #[[ATTR0]]
; CHECK-NEXT: store i8 1, ptr [[PTR]], align 1
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr nonnull align 1 [[PTR]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%ptr = tail call ptr @malloc(i32 %size) #1
store i8 1, ptr %ptr ;; fdata[0] = 1;
%memset = tail call ptr @memset(ptr nonnull %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
define ptr @memset_size_select(i1 %b, ptr %ptr) {
; CHECK-LABEL: @memset_size_select(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(10) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call ptr @memset(ptr nonnull %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
define ptr @memset_size_select2(i1 %b, ptr %ptr) {
; CHECK-LABEL: @memset_size_select2(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(80) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call ptr @memset(ptr nonnull dereferenceable(80) %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
define ptr @memset_size_select3(i1 %b, ptr %ptr) {
; CHECK-LABEL: @memset_size_select3(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false)
; CHECK-NEXT: ret ptr [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call ptr @memset(ptr dereferenceable_or_null(40) %ptr, i32 0, i32 %size)
ret ptr %memset
}
define ptr @memset_size_select4(i1 %b, ptr %ptr) {
; CHECK-LABEL: @memset_size_select4(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call ptr @memset(ptr nonnull dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
define ptr @memset_size_ashr(i1 %b, ptr %ptr, i32 %v) {
; CHECK-LABEL: @memset_size_ashr(
; CHECK-NEXT: [[SIZE:%.*]] = ashr i32 -2, [[V:%.*]]
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr noundef nonnull align 1 dereferenceable(1) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%size = ashr i32 -2, %v
%memset = tail call ptr @memset(ptr nonnull %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
define ptr @memset_attrs1(i1 %b, ptr %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs1(
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr align 1 dereferenceable_or_null(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%memset = tail call ptr @memset(ptr dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
; be sure to drop nonnull since size is unknown and can be 0
; do not change dereferenceable attribute
define ptr @memset_attrs2(i1 %b, ptr %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs2(
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%memset = tail call ptr @memset(ptr nonnull dereferenceable(40) %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
; size is unknown, just copy attrs, no changes in attrs
define ptr @memset_attrs3(i1 %b, ptr %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs3(
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr nonnull align 1 dereferenceable_or_null(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%memset = tail call ptr @memset(ptr nonnull dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
; be sure to drop nonnull since size is unknown and can be 0
define ptr @memset_attrs4(i1 %b, ptr %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs4(
; CHECK-NEXT: tail call void @llvm.memset.p0.i32(ptr nonnull align 1 [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #[[ATTR0]]
; CHECK-NEXT: ret ptr [[PTR]]
;
%memset = tail call ptr @memset(ptr nonnull %ptr, i32 0, i32 %size) #1
ret ptr %memset
}
define ptr @test_no_incompatible_attr(ptr %mem, i32 %val, i32 %size) {
; CHECK-LABEL: @test_no_incompatible_attr(
; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[VAL:%.*]] to i8
; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr align 1 [[MEM:%.*]], i8 [[TMP1]], i32 [[SIZE:%.*]], i1 false)
; CHECK-NEXT: ret ptr [[MEM]]
;
%ret = call dereferenceable(1) ptr @memset(ptr %mem, i32 %val, i32 %size)
ret ptr %ret
}
attributes #0 = { nounwind ssp uwtable }
attributes #1 = { nounwind }
attributes #2 = { nounwind readnone }
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