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| ; RUN: opt -instcombine -S < %s | FileCheck %s --dump-input-on-failure
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.14.0"
; Function Attrs: nounwind ssp uwtable
define i64 @weird_identity_but_ok(i64 %sz) {
entry:
%call = tail call i8* @malloc(i64 %sz)
%calc_size = tail call i64 @llvm.objectsize.i64.p0i8(i8* %call, i1 false, i1 true, i1 true)
tail call void @free(i8* %call)
ret i64 %calc_size
}
; CHECK: define i64 @weird_identity_but_ok(i64 %sz)
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i64 %sz
; CHECK-NEXT: }
define i64 @phis_are_neat(i1 %which) {
entry:
br i1 %which, label %first_label, label %second_label
first_label:
%first_call = call i8* @malloc(i64 10)
br label %join_label
second_label:
%second_call = call i8* @malloc(i64 30)
br label %join_label
join_label:
%joined = phi i8* [ %first_call, %first_label ], [ %second_call, %second_label ]
%calc_size = tail call i64 @llvm.objectsize.i64.p0i8(i8* %joined, i1 false, i1 true, i1 true)
ret i64 %calc_size
}
; CHECK: %0 = phi i64 [ 10, %first_label ], [ 30, %second_label ]
; CHECK-NEXT: ret i64 %0
define i64 @internal_pointer(i64 %sz) {
entry:
%ptr = call i8* @malloc(i64 %sz)
%ptr2 = getelementptr inbounds i8, i8* %ptr, i32 2
%calc_size = call i64 @llvm.objectsize.i64.p0i8(i8* %ptr2, i1 false, i1 true, i1 true)
ret i64 %calc_size
}
; CHECK: define i64 @internal_pointer(i64 %sz)
; CHECK-NEXT: entry:
; CHECK-NEXT: %0 = add i64 %sz, -2
; CHECK-NEXT: %1 = icmp ult i64 %sz, 2
; CHECK-NEXT: %2 = select i1 %1, i64 0, i64 %0
; CHECK-NEXT: ret i64 %2
; CHECK-NEXT: }
define i64 @uses_nullptr_no_fold() {
entry:
%res = call i64 @llvm.objectsize.i64.p0i8(i8* null, i1 false, i1 true, i1 true)
ret i64 %res
}
; CHECK: %res = call i64 @llvm.objectsize.i64.p0i8(i8* null, i1 false, i1 true, i1 true)
define i64 @uses_nullptr_fold() {
entry:
; NOTE: the third parameter to this call is false, unlike above.
%res = call i64 @llvm.objectsize.i64.p0i8(i8* null, i1 false, i1 false, i1 true)
ret i64 %res
}
; CHECK: ret i64 0
@d = common global i8 0, align 1
@c = common global i32 0, align 4
; Function Attrs: nounwind
define void @f() {
entry:
%.pr = load i32, i32* @c, align 4
%tobool4 = icmp eq i32 %.pr, 0
br i1 %tobool4, label %for.end, label %for.body
for.body: ; preds = %entry, %for.body
%dp.05 = phi i8* [ %add.ptr, %for.body ], [ @d, %entry ]
%0 = tail call i64 @llvm.objectsize.i64.p0i8(i8* %dp.05, i1 false, i1 true, i1 true)
%conv = trunc i64 %0 to i32
tail call void @bury(i32 %conv) #3
%1 = load i32, i32* @c, align 4
%idx.ext = sext i32 %1 to i64
%add.ptr.offs = add i64 %idx.ext, 0
%2 = add i64 undef, %add.ptr.offs
%add.ptr = getelementptr inbounds i8, i8* %dp.05, i64 %idx.ext
%add = shl nsw i32 %1, 1
store i32 %add, i32* @c, align 4
%tobool = icmp eq i32 %1, 0
br i1 %tobool, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}
; CHECK: define void @f()
; CHECK: call i64 @llvm.objectsize.i64.p0i8(
declare void @bury(i32) local_unnamed_addr #2
; Function Attrs: nounwind allocsize(0)
declare i8* @malloc(i64)
declare i8* @get_unknown_buffer()
; Function Attrs: nounwind
declare void @free(i8* nocapture)
; Function Attrs: nounwind readnone speculatable
declare i64 @llvm.objectsize.i64.p0i8(i8*, i1, i1, i1)
|