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[msan] More precise instrumentation of select IR.

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Some bits of select result may be initialized even if select condition
is not.

https://code.google.com/p/memory-sanitizer/issues/detail?id=50


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204716 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evgeniy Stepanov
2014-03-25 13:08:34 +00:00
parent 3527e5fcb3
commit 800399636a
2 changed files with 74 additions and 34 deletions
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48
test/Instrumentation/MemorySanitizer/msan_basic.ll
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@@ -249,13 +249,16 @@ entry:
}
; CHECK: @Select
; CHECK: select
; CHECK-NEXT: sext i1 {{.*}} to i32
; CHECK: select i1
; CHECK-NEXT: or i32
; CHECK-NEXT: select
; CHECK-NEXT: xor i32
; CHECK-NEXT: or i32
; CHECK-NEXT: select i1
; CHECK-ORIGINS: select
; CHECK-ORIGINS: select
; CHECK: select
; CHECK-NEXT: select i1
; CHECK: store i32{{.*}}@__msan_retval_tls
; CHECK-ORIGINS: store i32{{.*}}@__msan_retval_origin_tls
; CHECK: ret i32
@@ -271,19 +274,18 @@ entry:
; CHECK: @SelectVector
; CHECK: select <8 x i1>
; CHECK-NEXT: sext <8 x i1> {{.*}} to <8 x i16>
; CHECK-NEXT: or <8 x i16>
; CHECK-ORIGINS: bitcast <8 x i1> {{.*}} to i8
; CHECK-ORIGINS: icmp ne i8 {{.*}}, 0
; CHECK-ORIGINS: bitcast <8 x i1> {{.*}} to i8
; CHECK-ORIGINS: icmp ne i8 {{.*}}, 0
; CHECK-ORIGINS: select i1
; CHECK-ORIGINS: select i1
; CHECK: select <8 x i1>
; CHECK-NEXT: xor <8 x i16>
; CHECK-NEXT: or <8 x i16>
; CHECK-NEXT: select <8 x i1>
; CHECK-ORIGINS: select
; CHECK-ORIGINS: select
; CHECK-NEXT: select <8 x i1>
; CHECK: store <8 x i16>{{.*}}@__msan_retval_tls
; CHECK-ORIGINS: store i32{{.*}}@__msan_retval_origin_tls
; CHECK: ret <8 x i16>
; Check that we propagate origin for "select" with scalar condition and vector
; arguments. Select condition shadow is sign-extended to the vector type and
; mixed into the result shadow.
@@ -296,9 +298,10 @@ entry:
; CHECK: @SelectVector2
; CHECK: select i1
; CHECK: sext i1 {{.*}} to i128
; CHECK: bitcast i128 {{.*}} to <8 x i16>
; CHECK: or <8 x i16>
; CHECK: xor <8 x i16>
; CHECK: or <8 x i16>
; CHECK: select i1
; CHECK-ORIGINS: select i1
; CHECK-ORIGINS: select i1
; CHECK: select i1
@@ -320,6 +323,21 @@ entry:
; CHECK: ret { i64, i64 }
define { i64*, double } @SelectStruct2(i1 zeroext %x, { i64*, double } %a, { i64*, double } %b) readnone sanitize_memory {
entry:
%c = select i1 %x, { i64*, double } %a, { i64*, double } %b
ret { i64*, double } %c
}
; CHECK: @SelectStruct2
; CHECK: select i1 {{.*}}, { i64, i64 }
; CHECK-NEXT: select i1 {{.*}}, { i64, i64 } { i64 -1, i64 -1 }, { i64, i64 }
; CHECK-ORIGINS: select i1
; CHECK-ORIGINS: select i1
; CHECK-NEXT: select i1 {{.*}}, { i64*, double }
; CHECK: ret { i64*, double }
define i8* @IntToPtr(i64 %x) nounwind uwtable readnone sanitize_memory {
entry:
%0 = inttoptr i64 %x to i8*