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1; RUN: opt < %s -msan-check-access-address=0 -msan-eager-checks=1 -msan-track-origins=1 -S -passes=msan 2>&1 | FileCheck --check-prefixes=CHECK,CONST %s --implicit-check-not=icmp --implicit-check-not="store i" --implicit-check-not="call void @__msan"2; RUN: opt < %s -msan-check-access-address=0 -msan-check-constant-shadow=0 -msan-eager-checks=1 -msan-track-origins=1 -S -passes=msan 2>&1 | FileCheck --check-prefixes=CHECK %s --implicit-check-not=icmp --implicit-check-not="store i" --implicit-check-not="call void @__msan"3 4target 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"5target triple = "x86_64-unknown-linux-gnu"6 7; Test that returning a literal undef from main() triggers an MSan warning.8 9; main() is special: it inserts check for the return value10define i32 @main() nounwind uwtable sanitize_memory {11entry:12 ret i32 undef13}14 15; CHECK-LABEL: @main16; CHECK: store i32 0, ptr @__msan_retval_tls17; CONST: call void @__msan_warning_with_origin_noreturn18; CHECK: ret i32 undef19 20 21; This function stores known initialized value.22; Expect 2 stores: one for the shadow (0), one for the value (42), but no origin.23define void @StoreConstant(ptr nocapture %p) nounwind uwtable sanitize_memory {24entry:25 store i32 42, ptr %p, align 426 ret void27}28 29; CHECK-LABEL: @StoreConstant30; CHECK: store i32 0,31; CHECK: store i32 42,32; CHECK: ret void33 34 35; This function stores known uninitialized value.36; Expect 3 stores: shadow, value and origin.37; Expect no icmp(s): everything here is unconditional.38define void @StoreUndef(ptr nocapture %p) nounwind uwtable sanitize_memory {39entry:40 store i32 undef, ptr %p, align 441 ret void42}43 44; CHECK-LABEL: @StoreUndef45; CHECK: store i32 -1,46; CONST: store i32 0,47; CHECK: store i32 undef,48; CHECK: ret void49 50 51; This function stores known initialized value, but msan can't prove this.52define i32 @MaybeUninitialized(<2 x i64> noundef %acc) nounwind uwtable sanitize_memory {53entry:54 %shift = shufflevector <2 x i64> %acc, <2 x i64> poison, <2 x i32> <i32 1, i32 undef>55 %0 = add <2 x i64> %shift, %acc56 %1 = bitcast <2 x i64> %0 to <4 x i32>57 %conv = extractelement <4 x i32> %1, i64 058 ret i32 %conv59}60 61; CHECK-LABEL: @MaybeUninitialized62; CHECK: store i32 extractelement (<4 x i32> bitcast (<2 x i64> <i64 0, i64 undef> to <4 x i32>), i64 0), ptr @__msan_retval_tls, align 863; CHECK: store i32 0, ptr @__msan_retval_origin_tls64 65; This function stores known initialized value, but msan can't prove this.66define noundef i32 @MaybeUninitializedRetNoUndef(<2 x i64> noundef %acc) nounwind uwtable sanitize_memory {67entry:68 %shift = shufflevector <2 x i64> %acc, <2 x i64> poison, <2 x i32> <i32 1, i32 undef>69 %0 = add <2 x i64> %shift, %acc70 %1 = bitcast <2 x i64> %0 to <4 x i32>71 %conv = extractelement <4 x i32> %1, i64 072 ret i32 %conv73}74 75; CHECK-LABEL: @MaybeUninitializedRetNoUndef76; CONST: [[CMP:%.*]] = icmp ne i32 extractelement (<4 x i32> bitcast (<2 x i64> <i64 0, i64 undef> to <4 x i32>), i64 0), 077; CONST: br i1 [[CMP]]78; CONST: call void @__msan_warning_with_origin_noreturn79 80; CHECK: call void @__msan_init()81