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https://github.com/c64scene-ar/llvm-6502.git
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f891336a25
Currently, the ASan executables built with -O0 are unnecessarily slow. The main reason is that ASan instrumentation pass inserts redundant checks around promotable allocas. These allocas do not get instrumented under -O1 because they get converted to virtual registered by mem2reg. With this patch, ASan instrumentation pass will only instrument non promotable allocas, giving us a speedup of 39% on a collection of benchmarks with -O0. (There is no measurable speedup at -O1.) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230724 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
3.3 KiB
LLVM
90 lines
3.3 KiB
LLVM
; Test hanlding of llvm.lifetime intrinsics.
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; RUN: opt < %s -asan -asan-module -asan-check-lifetime -asan-use-after-return=0 -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
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define void @lifetime_no_size() sanitize_address {
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entry:
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%i = alloca i32, align 4
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%i.ptr = bitcast i32* %i to i8*
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call void @llvm.lifetime.start(i64 -1, i8* %i.ptr)
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store volatile i8 0, i8* %i.ptr
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call void @llvm.lifetime.end(i64 -1, i8* %i.ptr)
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; Check that lifetime with no size are ignored.
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; CHECK-LABEL: define void @lifetime_no_size()
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; CHECK-NOT: @__asan_poison_stack_memory
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; CHECK-NOT: @__asan_unpoison_stack_memory
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; CHECK: ret void
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ret void
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}
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; Generic case of lifetime analysis.
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define void @lifetime() sanitize_address {
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; CHECK-LABEL: define void @lifetime()
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; Regular variable lifetime intrinsics.
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%i = alloca i32, align 4
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%i.ptr = bitcast i32* %i to i8*
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call void @llvm.lifetime.start(i64 3, i8* %i.ptr)
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store volatile i8 0, i8* %i.ptr
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; Memory is unpoisoned at llvm.lifetime.start
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; CHECK: %[[VAR:[^ ]*]] = ptrtoint i32* %{{[^ ]+}} to i64
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; CHECK-NEXT: call void @__asan_unpoison_stack_memory(i64 %[[VAR]], i64 3)
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call void @llvm.lifetime.end(i64 4, i8* %i.ptr)
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call void @llvm.lifetime.end(i64 2, i8* %i.ptr)
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; Memory is poisoned at every call to llvm.lifetime.end
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; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 4)
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; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 2)
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; Lifetime intrinsics for array.
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%arr = alloca [10 x i32], align 16
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%arr.ptr = bitcast [10 x i32]* %arr to i8*
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call void @llvm.lifetime.start(i64 40, i8* %arr.ptr)
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store volatile i8 0, i8* %arr.ptr
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; CHECK: call void @__asan_unpoison_stack_memory(i64 %{{[^ ]+}}, i64 40)
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call void @llvm.lifetime.end(i64 40, i8* %arr.ptr)
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; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 40)
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; One more lifetime start/end for the same variable %i.
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call void @llvm.lifetime.start(i64 4, i8* %i.ptr)
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store volatile i8 0, i8* %i.ptr
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; CHECK: call void @__asan_unpoison_stack_memory(i64 %{{[^ ]+}}, i64 4)
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call void @llvm.lifetime.end(i64 4, i8* %i.ptr)
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; CHECK: call void @__asan_poison_stack_memory(i64 %{{[^ ]+}}, i64 4)
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; Memory is unpoisoned at function exit (only once).
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; CHECK: call void @__asan_unpoison_stack_memory(i64 %{{[^ ]+}}, i64 {{.*}})
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; CHECK-NOT: @__asan_unpoison_stack_memory
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; CHECK: ret void
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ret void
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}
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; Check that arguments of lifetime may come from phi nodes.
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define void @phi_args(i1 %x) sanitize_address {
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; CHECK-LABEL: define void @phi_args(i1 %x)
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entry:
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%i = alloca i64, align 4
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%i.ptr = bitcast i64* %i to i8*
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call void @llvm.lifetime.start(i64 8, i8* %i.ptr)
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store volatile i8 0, i8* %i.ptr
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; CHECK: __asan_unpoison_stack_memory
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br i1 %x, label %bb0, label %bb1
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bb0:
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%i.ptr2 = bitcast i64* %i to i8*
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br label %bb1
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bb1:
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%i.phi = phi i8* [ %i.ptr, %entry ], [ %i.ptr2, %bb0 ]
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call void @llvm.lifetime.end(i64 8, i8* %i.phi)
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; CHECK: __asan_poison_stack_memory
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; CHECK: ret void
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ret void
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}
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