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llvm-mirror/test/Transforms/InstCombine/memset-1.ll
David Bolvansky 4d7d2beaf1 [SimplifyLibCalls] Mark known arguments with nonnull 
Reviewers: efriedma, jdoerfert

Reviewed By: jdoerfert

Subscribers: ychen, rsmith, joerg, aaron.ballman, lebedev.ri, uenoku, jdoerfert, hfinkel, javed.absar, spatel, dmgreen, llvm-commits

Differential Revision: https://reviews.llvm.org/D53342

llvm-svn: 372091
2019-09-17 09:32:52 +00:00

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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 -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 i8* @memset(i8*, i32, i32)
declare void @llvm.memset.p0i8.i32(i8* nocapture writeonly, i8, i32, i32, i1)
declare noalias i8* @malloc(i32) #1
; Check memset(mem1, val, size) -> llvm.memset(mem1, val, size, 1).
define i8* @test_simplify1(i8* %mem, i32 %val, i32 %size) {
; CHECK-LABEL: @test_simplify1(
; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[VAL:%.*]] to i8
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[MEM:%.*]], i8 [[TMP1]], i32 [[SIZE:%.*]], i1 false)
; CHECK-NEXT: ret i8* [[MEM]]
;
%ret = call i8* @memset(i8* %mem, i32 %val, i32 %size)
ret i8* %ret
}
define i8* @pr25892_lite(i32 %size) #0 {
; CHECK-LABEL: @pr25892_lite(
; CHECK-NEXT: [[CALLOC:%.*]] = call i8* @calloc(i32 1, i32 [[SIZE:%.*]])
; CHECK-NEXT: ret i8* [[CALLOC]]
;
%call1 = call i8* @malloc(i32 %size) #1
%call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1
ret i8* %call2
}
; FIXME: A memset intrinsic should be handled similarly to a memset() libcall.
define i8* @malloc_and_memset_intrinsic(i32 %n) #0 {
; CHECK-LABEL: @malloc_and_memset_intrinsic(
; CHECK-NEXT: [[CALL:%.*]] = call i8* @malloc(i32 [[N:%.*]])
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[CALL]], i8 0, i32 [[N]], i1 false)
; CHECK-NEXT: ret i8* [[CALL]]
;
%call = call i8* @malloc(i32 %n)
call void @llvm.memset.p0i8.i32(i8* %call, i8 0, i32 %n, i32 1, i1 false)
ret i8* %call
}
; This should not create a calloc and should not crash the compiler.
define i8* @notmalloc_memset(i32 %size, i8*(i32)* %notmalloc) {
; CHECK-LABEL: @notmalloc_memset(
; CHECK-NEXT: [[CALL1:%.*]] = call i8* [[NOTMALLOC:%.*]](i32 [[SIZE:%.*]]) #0
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 [[CALL1]], i8 0, i32 [[SIZE]], i1 false) #0
; CHECK-NEXT: ret i8* [[CALL1]]
;
%call1 = call i8* %notmalloc(i32 %size) #1
%call2 = call i8* @memset(i8* %call1, i32 0, i32 %size) #1
ret i8* %call2
}
; FIXME: memset(malloc(x), 0, x) -> calloc(1, x)
; This doesn't fire currently because the malloc has more than one use.
define float* @pr25892(i32 %size) #0 {
; CHECK-LABEL: @pr25892(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CALL:%.*]] = tail call i8* @malloc(i32 [[SIZE:%.*]]) #0
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8* [[CALL]], null
; CHECK-NEXT: br i1 [[CMP]], label [[CLEANUP:%.*]], label [[IF_END:%.*]]
; CHECK: if.end:
; CHECK-NEXT: [[BC:%.*]] = bitcast i8* [[CALL]] to float*
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[CALL]], i8 0, i32 [[SIZE]], i1 false) #0
; CHECK-NEXT: br label [[CLEANUP]]
; CHECK: cleanup:
; CHECK-NEXT: [[RETVAL_0:%.*]] = phi float* [ [[BC]], [[IF_END]] ], [ null, [[ENTRY:%.*]] ]
; CHECK-NEXT: ret float* [[RETVAL_0]]
;
entry:
%call = tail call i8* @malloc(i32 %size) #1
%cmp = icmp eq i8* %call, null
br i1 %cmp, label %cleanup, label %if.end
if.end:
%bc = bitcast i8* %call to float*
%call2 = tail call i8* @memset(i8* nonnull %call, i32 0, i32 %size) #1
br label %cleanup
cleanup:
%retval.0 = phi float* [ %bc, %if.end ], [ null, %entry ]
ret float* %retval.0
}
; If there's a calloc transform, the store must also be eliminated.
define i8* @buffer_is_modified_then_memset(i32 %size) {
; CHECK-LABEL: @buffer_is_modified_then_memset(
; CHECK-NEXT: [[PTR:%.*]] = tail call i8* @malloc(i32 [[SIZE:%.*]]) #0
; CHECK-NEXT: store i8 1, i8* [[PTR]], align 1
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[PTR]], i8 0, i32 [[SIZE]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%ptr = tail call i8* @malloc(i32 %size) #1
store i8 1, i8* %ptr ;; fdata[0] = 1;
%memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
define i8* @memset_size_select(i1 %b, i8* %ptr) {
; CHECK-LABEL: @memset_size_select(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(10) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
define i8* @memset_size_select2(i1 %b, i8* %ptr) {
; CHECK-LABEL: @memset_size_select2(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(80) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call i8* @memset(i8* nonnull dereferenceable(80) %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
define i8* @memset_size_select3(i1 %b, i8* %ptr) {
; CHECK-LABEL: @memset_size_select3(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false)
; CHECK-NEXT: ret i8* [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call i8* @memset(i8* dereferenceable_or_null(40) %ptr, i32 0, i32 %size)
ret i8* %memset
}
define i8* @memset_size_select4(i1 %b, i8* %ptr) {
; CHECK-LABEL: @memset_size_select4(
; CHECK-NEXT: [[SIZE:%.*]] = select i1 [[B:%.*]], i32 10, i32 50
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%size = select i1 %b, i32 10, i32 50
%memset = tail call i8* @memset(i8* nonnull dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
define i8* @memset_size_ashr(i1 %b, i8* %ptr, i32 %v) {
; CHECK-LABEL: @memset_size_ashr(
; CHECK-NEXT: [[SIZE:%.*]] = ashr i32 -2, [[V:%.*]]
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[PTR:%.*]], i8 0, i32 [[SIZE]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%size = ashr i32 -2, %v
%memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
define i8* @memset_attrs1(i1 %b, i8* %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs1(
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* align 1 dereferenceable_or_null(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%memset = tail call i8* @memset(i8* dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
; be sure to drop nonnull since size is unknown and can be 0
; do not change dereferenceable attribute
define i8* @memset_attrs2(i1 %b, i8* %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs2(
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%memset = tail call i8* @memset(i8* nonnull dereferenceable(40) %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
; size is unknown, just copy attrs, no changes in attrs
define i8* @memset_attrs3(i1 %b, i8* %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs3(
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 dereferenceable_or_null(40) [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%memset = tail call i8* @memset(i8* nonnull dereferenceable_or_null(40) %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
; be sure to drop nonnull since size is unknown and can be 0
define i8* @memset_attrs4(i1 %b, i8* %ptr, i32 %size) {
; CHECK-LABEL: @memset_attrs4(
; CHECK-NEXT: call void @llvm.memset.p0i8.i32(i8* nonnull align 1 [[PTR:%.*]], i8 0, i32 [[SIZE:%.*]], i1 false) #0
; CHECK-NEXT: ret i8* [[PTR]]
;
%memset = tail call i8* @memset(i8* nonnull %ptr, i32 0, i32 %size) #1
ret i8* %memset
}
attributes #0 = { nounwind ssp uwtable }
attributes #1 = { nounwind }
attributes #2 = { nounwind readnone }
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