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llvm-project/llvm/test/Analysis/BasicAA/modref.ll
Nikita Popov c23b4fbdbb
[IR] Remove size argument from lifetime intrinsics (#150248) 
Now that #149310 has restricted lifetime intrinsics to only work on
allocas, we can also drop the explicit size argument. Instead, the size
is implied by the alloca.

This removes the ability to only mark a prefix of an alloca alive/dead.
We never used that capability, so we should remove the need to handle
that possibility everywhere (though many key places, including stack
coloring, did not actually respect this).
2025-08-08 11:09:34 +02:00

266 lines
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LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -aa-pipeline=basic-aa -passes=gvn,dse -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
declare void @llvm.lifetime.end.p0(ptr nocapture)
declare void @external(ptr)
define i32 @test0(ptr %P) {
; CHECK-LABEL: @test0(
; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
; CHECK-NEXT: call void @external(ptr [[A]])
; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr [[P:%.*]], i8 0, i32 42, i1 false)
; CHECK-NEXT: ret i32 0
;
%A = alloca i32
call void @external(ptr %A)
store i32 0, ptr %A
call void @llvm.memset.p0.i32(ptr %P, i8 0, i32 42, i1 false)
%B = load i32, ptr %A
ret i32 %B
}
define i8 @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT: ret i8 2
;
%A = alloca i8
%B = alloca i8
store i8 2, ptr %B ;; Not written to by memcpy
call void @llvm.memcpy.p0.p0.i8(ptr %A, ptr %B, i8 -1, i1 false)
%C = load i8, ptr %B
ret i8 %C
}
define i8 @test2(ptr %P) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: [[P2:%.*]] = getelementptr i8, ptr [[P:%.*]], i32 127
; CHECK-NEXT: store i8 1, ptr [[P2]], align 1
; CHECK-NEXT: call void @llvm.memset.p0.i8(ptr [[P]], i8 2, i8 127, i1 false)
; CHECK-NEXT: ret i8 1
;
%P2 = getelementptr i8, ptr %P, i32 127
store i8 1, ptr %P2 ;; Not dead across memset
call void @llvm.memset.p0.i8(ptr %P, i8 2, i8 127, i1 false)
%A = load i8, ptr %P2
ret i8 %A
}
define i8 @test2a(ptr %P) {
; CHECK-LABEL: @test2a(
; CHECK-NEXT: call void @llvm.memset.p0.i8(ptr [[P:%.*]], i8 2, i8 127, i1 false)
; CHECK-NEXT: ret i8 2
;
%P2 = getelementptr i8, ptr %P, i32 126
store i8 1, ptr %P2 ;; Dead, clobbered by memset.
call void @llvm.memset.p0.i8(ptr %P, i8 2, i8 127, i1 false)
%A = load i8, ptr %P2
ret i8 %A
}
define void @test3(i8 %X) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: [[P:%.*]] = alloca i64, align 8
; CHECK-NEXT: [[P2:%.*]] = getelementptr i8, ptr [[P]], i32 2
; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr [[P]])
; CHECK-NEXT: store i8 2, ptr [[P2]], align 1
; CHECK-NEXT: call void @external(ptr [[P]])
; CHECK-NEXT: ret void
;
%P = alloca i64
%Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
%P2 = getelementptr i8, ptr %P, i32 2
store i8 %Y, ptr %P2 ;; Not read by lifetime.end, should be removed.
call void @llvm.lifetime.end.p0(ptr %P)
store i8 2, ptr %P2
call void @external(ptr %P)
ret void
}
define void @test3a(i8 %X) {
; CHECK-LABEL: @test3a(
; CHECK-NEXT: [[P:%.*]] = alloca i64, align 8
; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr [[P]])
; CHECK-NEXT: ret void
;
%P = alloca i64
%Y = add i8 %X, 1 ;; Dead, because the only use (the store) is dead.
%P2 = getelementptr i8, ptr %P, i32 2
store i8 %Y, ptr %P2
call void @llvm.lifetime.end.p0(ptr %P)
ret void
}
@G1 = external global i32
@G2 = external global [4000 x i32]
define i32 @test4(ptr %P) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: call void @llvm.memset.p0.i32(ptr @G2, i8 0, i32 4000, i1 false)
; CHECK-NEXT: ret i32 0
;
%tmp = load i32, ptr @G1
call void @llvm.memset.p0.i32(ptr @G2, i8 0, i32 4000, i1 false)
%tmp2 = load i32, ptr @G1
%sub = sub i32 %tmp2, %tmp
ret i32 %sub
}
; Verify that basicaa is handling variable length memcpy, knowing it doesn't
; write to G1.
define i32 @test5(ptr %P, i32 %Len) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr @G2, ptr @G1, i32 [[LEN:%.*]], i1 false)
; CHECK-NEXT: ret i32 0
;
%tmp = load i32, ptr @G1
call void @llvm.memcpy.p0.p0.i32(ptr @G2, ptr @G1, i32 %Len, i1 false)
%tmp2 = load i32, ptr @G1
%sub = sub i32 %tmp2, %tmp
ret i32 %sub
}
define i8 @test6(ptr %p, ptr noalias %a) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: [[X:%.*]] = load i8, ptr [[A:%.*]], align 1
; CHECK-NEXT: [[T:%.*]] = va_arg ptr [[P:%.*]], float
; CHECK-NEXT: [[Z:%.*]] = add i8 [[X]], [[X]]
; CHECK-NEXT: ret i8 [[Z]]
;
%x = load i8, ptr %a
%t = va_arg ptr %p, float
%y = load i8, ptr %a
%z = add i8 %x, %y
ret i8 %z
}
; PR10628
declare void @test7decl(ptr nocapture %x)
define i32 @test7() nounwind uwtable ssp {
; CHECK-LABEL: @test7(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[X:%.*]] = alloca i32, align 4
; CHECK-NEXT: store i32 0, ptr [[X]], align 4
; CHECK-NEXT: [[ADD_PTR:%.*]] = getelementptr inbounds i32, ptr [[X]], i64 1
; CHECK-NEXT: call void @test7decl(ptr [[ADD_PTR]])
; CHECK-NEXT: [[TMP:%.*]] = load i32, ptr [[X]], align 4
; CHECK-NEXT: ret i32 [[TMP]]
;
entry:
%x = alloca i32, align 4
store i32 0, ptr %x, align 4
%add.ptr = getelementptr inbounds i32, ptr %x, i64 1
call void @test7decl(ptr %add.ptr)
%tmp = load i32, ptr %x, align 4
ret i32 %tmp
}
;; Check that aa correctly handles functions marked with argmemonly
;; attribute.
declare i32 @func_argmemonly(ptr %P) argmemonly
;; Can not remove redundant load, function may write to it.
define i32 @test8(ptr %P) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @func_argmemonly(ptr [[P]])
; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT: [[DIFF:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NEXT: ret i32 [[DIFF]]
;
%V1 = load i32, ptr %P
call i32 @func_argmemonly(ptr %P)
%V2 = load i32, ptr %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
}
;; In this case load can be removed, function clobbers only %P2.
define i32 @test9(ptr %P, ptr noalias %P2) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @func_argmemonly(ptr [[P2:%.*]])
; CHECK-NEXT: ret i32 0
;
%V1 = load i32, ptr %P
call i32 @func_argmemonly(ptr %P2)
%V2 = load i32, ptr %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
}
;; In this case load can *not* be removed. Function clobers only %P2 but it may
;; alias with %P.
define i32 @test10(ptr %P, ptr %P2) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @func_argmemonly(ptr [[P2:%.*]])
; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT: [[DIFF:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NEXT: ret i32 [[DIFF]]
;
%V1 = load i32, ptr %P
call i32 @func_argmemonly(ptr %P2)
%V2 = load i32, ptr %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
}
define i32 @test11(ptr %P, ptr %P2) {
; CHECK-LABEL: @test11(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @func_argmemonly(ptr readonly [[P2:%.*]])
; CHECK-NEXT: ret i32 0
;
%V1 = load i32, ptr %P
call i32 @func_argmemonly(ptr readonly %P2)
%V2 = load i32, ptr %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
}
declare i32 @func_argmemonly_two_args(ptr %P, ptr %P2) argmemonly
define i32 @test12(ptr %P, ptr %P2, ptr %P3) {
; CHECK-LABEL: @test12(
; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[P:%.*]], align 4
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @func_argmemonly_two_args(ptr readonly [[P2:%.*]], ptr [[P3:%.*]])
; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[P]], align 4
; CHECK-NEXT: [[DIFF:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NEXT: ret i32 [[DIFF]]
;
%V1 = load i32, ptr %P
call i32 @func_argmemonly_two_args(ptr readonly %P2, ptr %P3)
%V2 = load i32, ptr %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
}
define i32 @test13(ptr %P, ptr %P2) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @func_argmemonly(ptr readnone [[P2:%.*]])
; CHECK-NEXT: ret i32 0
;
%V1 = load i32, ptr %P
call i32 @func_argmemonly(ptr readnone %P2)
%V2 = load i32, ptr %P
%Diff = sub i32 %V1, %V2
ret i32 %Diff
}
declare void @llvm.memset.p0.i32(ptr nocapture, i8, i32, i1) nounwind
declare void @llvm.memset.p0.i8(ptr nocapture, i8, i8, i1) nounwind
declare void @llvm.memcpy.p0.p0.i8(ptr nocapture, ptr nocapture, i8, i1) nounwind
declare void @llvm.memcpy.p0.p0.i32(ptr nocapture, ptr nocapture, i32, i1) nounwind
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