b0ffa8befe
Summary: Normally, the Origin is passed over TLS, which seems like it introduces unnecessary overhead. It's in the (extremely) cold path though, so the only overhead is in code size. But with eager-checks, calls to __msan_warning functions are extremely common, so this becomes a useful optimization. This can save ~5% code size. Reviewers: eugenis, vitalybuka Reviewed By: eugenis, vitalybuka Subscribers: hiraditya, #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D81700
58 lines
2.0 KiB
LLVM
58 lines
2.0 KiB
LLVM
; RUN: opt < %s -msan-check-access-address=0 -S -passes=msan 2>&1 | FileCheck \
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; RUN: %s
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; RUN: opt < %s -msan -msan-check-access-address=0 -S | FileCheck %s
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; RUN: opt < %s -msan-check-access-address=1 -S -passes=msan 2>&1 | FileCheck \
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; RUN: %s --check-prefix=ADDR
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; RUN: opt < %s -msan -msan-check-access-address=1 -S | FileCheck %s --check-prefix=ADDR
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; REQUIRES: x86-registered-target
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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.x86.sse.stmxcsr(i8*)
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declare void @llvm.x86.sse.ldmxcsr(i8*)
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define void @getcsr(i32 *%p) sanitize_memory {
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entry:
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%0 = bitcast i32* %p to i8*
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call void @llvm.x86.sse.stmxcsr(i8* %0)
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ret void
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}
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; CHECK-LABEL: @getcsr(
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; CHECK: store i32 0, i32*
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; CHECK: call void @llvm.x86.sse.stmxcsr(
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; CHECK: ret void
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; ADDR-LABEL: @getcsr(
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; ADDR: %[[A:.*]] = load i64, i64* getelementptr inbounds {{.*}} @__msan_param_tls, i32 0, i32 0), align 8
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; ADDR: %[[B:.*]] = icmp ne i64 %[[A]], 0
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; ADDR: br i1 %[[B]], label {{.*}}, label
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; ADDR: call void @__msan_warning_with_origin_noreturn(i32 0)
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; ADDR: call void @llvm.x86.sse.stmxcsr(
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; ADDR: ret void
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; Function Attrs: nounwind uwtable
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define void @setcsr(i32 *%p) sanitize_memory {
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entry:
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%0 = bitcast i32* %p to i8*
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call void @llvm.x86.sse.ldmxcsr(i8* %0)
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ret void
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}
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; CHECK-LABEL: @setcsr(
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; CHECK: %[[A:.*]] = load i32, i32* %{{.*}}, align 1
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; CHECK: %[[B:.*]] = icmp ne i32 %[[A]], 0
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; CHECK: br i1 %[[B]], label {{.*}}, label
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; CHECK: call void @__msan_warning_with_origin_noreturn(i32 0)
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; CHECK: call void @llvm.x86.sse.ldmxcsr(
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; CHECK: ret void
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; ADDR-LABEL: @setcsr(
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; ADDR: %[[A:.*]] = load i64, i64* getelementptr inbounds {{.*}} @__msan_param_tls, i32 0, i32 0), align 8
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; ADDR: %[[B:.*]] = icmp ne i64 %[[A]], 0
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; ADDR: br i1 %[[B]], label {{.*}}, label
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; ADDR: call void @__msan_warning_with_origin_noreturn(i32 0)
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; ADDR: call void @llvm.x86.sse.ldmxcsr(
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; ADDR: ret void
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