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