1; RUN: opt < %s -msan-check-access-address=1 -S -passes=msan 2>&1 | FileCheck %s --implicit-check-not="call void @__msan_warning" 2 3target 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" 4target triple = "x86_64-unknown-linux-gnu" 5 6 7; Test byval argument shadow alignment 8 9define <2 x i64> @ByValArgumentShadowLargeAlignment(ptr byval(<2 x i64>) %p) sanitize_memory { 10entry: 11 %x = load <2 x i64>, ptr %p 12 ret <2 x i64> %x 13} 14 15; CHECK-LABEL: @ByValArgumentShadowLargeAlignment 16; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 8 {{.*}}, ptr align 8 {{.*}}, i64 16, i1 false) 17; CHECK: ret <2 x i64> 18 19 20define i16 @ByValArgumentShadowSmallAlignment(ptr byval(i16) %p) sanitize_memory { 21entry: 22 %x = load i16, ptr %p 23 ret i16 %x 24} 25 26; CHECK-LABEL: @ByValArgumentShadowSmallAlignment 27; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 2 {{.*}}, ptr align 2 {{.*}}, i64 2, i1 false) 28; CHECK: ret i16 29 30 31; Check instrumentation of stores. The check must precede the shadow store. 32 33define void @Store(ptr nocapture %p, i32 %x) nounwind uwtable sanitize_memory { 34entry: 35 store i32 %x, ptr %p, align 4 36 ret void 37} 38 39; CHECK-LABEL: @Store 40; CHECK: load {{.*}} @__msan_param_tls 41; Shadow calculations must happen after the check. 42; CHECK-NOT: xor 43; CHECK: icmp 44; CHECK: br i1 45; CHECK: {{^[0-9]+}}: 46; CHECK: call void @__msan_warning_noreturn() 47; CHECK: {{^[0-9]+}}: 48; CHECK: xor 49; CHECK: store 50; CHECK: store i32 %x 51; CHECK: ret void 52 53 54