0e55d4fab0
Presence of operand bundles changes semantics in respect to ModRef. In particular, spec says: "From the compilers perspective, deoptimization operand bundles make the call sites theyre attached to at least readonly. They read through all of their pointer typed operands (even if theyre not otherwise escaped) and the entire visible heap. Deoptimization operand bundles do not capture their operands except during deoptimization, in which case control will not be returned to the compiled frame". Fix handling of llvm.memcpy.* according to the spec. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D118033
54 lines
2.3 KiB
LLVM
54 lines
2.3 KiB
LLVM
; RUN: opt < %s -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
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@G1 = external global i32
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1)
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declare void @llvm.memmove.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1)
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declare void @llvm.experimental.deoptimize.void(...)
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declare void @unknown_but_readonly() readonly
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define void @test1(i8* %p) {
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call void(...) @llvm.experimental.deoptimize.void() [ "deopt"() ]
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ret void
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; CHECK-LABEL: Function: test1:
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; CHECK: Just Ref: Ptr: i8* %p <-> call void (...) @llvm.experimental.deoptimize.isVoid() [ "deopt"() ]
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}
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; By specification calls with deopt bundles reads through all operands and entire heap.
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; Check that global G1 is reported as Ref by memcpy/memmove calls.
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define i32 @test_memcpy_with_deopt() {
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; CHECK-LABEL: Function: test_memcpy_with_deopt:
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; CHECK: Just Mod: Ptr: i8* %A <-> call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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; CHECK: Just Ref: Ptr: i8* %B <-> call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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; CHECK: Just Ref: Ptr: i32* @G1 <-> call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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%A = alloca i8
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%B = alloca i8
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store i32 2, i32* @G1 ;; Not referenced by semantics of memcpy but still may be read due to "deopt"
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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%C = load i32, i32* @G1
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ret i32 %C
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}
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define i32 @test_memmove_with_deopt() {
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; CHECK-LABEL: Function: test_memmove_with_deopt:
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; CHECK: Just Mod: Ptr: i8* %A <-> call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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; CHECK: Just Ref: Ptr: i8* %B <-> call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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; CHECK: Both ModRef: Ptr: i32* @G1 <-> call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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%A = alloca i8
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%B = alloca i8
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store i32 2, i32* @G1 ;; Not referenced by semantics of memcpy but still may be read due to "deopt"
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call void @llvm.memmove.p0i8.p0i8.i64(i8* %A, i8* %B, i64 -1, i1 false) [ "deopt"() ]
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%C = load i32, i32* @G1
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ret i32 %C
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}
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