; CHECK: ret i1 false
}
+define i1 @bitcast() {
+; CHECK: @bitcast
+ %a = alloca i32
+ %b = alloca i64
+ %x = bitcast i32* %a to i8*
+ %y = bitcast i64* %b to i8*
+ %cmp = icmp eq i8* %x, %y
+ ret i1 %cmp
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep() {
+; CHECK: @gep
+ %a = alloca [3 x i8], align 8
+ %x = getelementptr inbounds [3 x i8]* %a, i32 0, i32 0
+ %cmp = icmp eq i8* %x, null
+ ret i1 %cmp
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep2() {
+; CHECK: @gep2
+ %a = alloca [3 x i8], align 8
+ %x = getelementptr inbounds [3 x i8]* %a, i32 0, i32 0
+ %y = getelementptr inbounds [3 x i8]* %a, i32 0, i32 0
+ %cmp = icmp eq i8* %x, %y
+ ret i1 %cmp
+; CHECK-NEXT: ret i1 true
+}
+
+; PR11238
+%gept = type { i32, i32 }
+@gepy = global %gept zeroinitializer, align 8
+@gepz = extern_weak global %gept
+
+define i1 @gep3() {
+; CHECK: @gep3
+ %x = alloca %gept, align 8
+ %a = getelementptr %gept* %x, i64 0, i32 0
+ %b = getelementptr %gept* %x, i64 0, i32 1
+ %equal = icmp eq i32* %a, %b
+ ret i1 %equal
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep4() {
+; CHECK: @gep4
+ %x = alloca %gept, align 8
+ %a = getelementptr %gept* @gepy, i64 0, i32 0
+ %b = getelementptr %gept* @gepy, i64 0, i32 1
+ %equal = icmp eq i32* %a, %b
+ ret i1 %equal
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep5() {
+; CHECK: @gep5
+ %x = alloca %gept, align 8
+ %a = getelementptr inbounds %gept* %x, i64 0, i32 1
+ %b = getelementptr %gept* @gepy, i64 0, i32 0
+ %equal = icmp eq i32* %a, %b
+ ret i1 %equal
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep6(%gept* %x) {
+; Same as @gep3 but potentially null.
+; CHECK: @gep6
+ %a = getelementptr %gept* %x, i64 0, i32 0
+ %b = getelementptr %gept* %x, i64 0, i32 1
+ %equal = icmp eq i32* %a, %b
+ ret i1 %equal
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep7(%gept* %x) {
+; CHECK: @gep7
+ %a = getelementptr %gept* %x, i64 0, i32 0
+ %b = getelementptr %gept* @gepz, i64 0, i32 0
+ %equal = icmp eq i32* %a, %b
+ ret i1 %equal
+; CHECK: ret i1 %equal
+}
+
+define i1 @gep8(%gept* %x) {
+; CHECK: @gep8
+ %a = getelementptr %gept* %x, i32 1
+ %b = getelementptr %gept* %x, i32 -1
+ %equal = icmp ugt %gept* %a, %b
+ ret i1 %equal
+; CHECK: ret i1 %equal
+}
+
+define i1 @gep9(i8* %ptr) {
+; CHECK: @gep9
+; CHECK-NOT: ret
+; CHECK: ret i1 true
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 0
+ %first2 = getelementptr inbounds i8* %first1, i32 1
+ %first3 = getelementptr inbounds i8* %first2, i32 2
+ %first4 = getelementptr inbounds i8* %first3, i32 4
+ %last1 = getelementptr inbounds i8* %first2, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 8
+ %last3 = getelementptr inbounds i8* %last2, i32 -4
+ %last4 = getelementptr inbounds i8* %last3, i32 -4
+ %first.int = ptrtoint i8* %first4 to i32
+ %last.int = ptrtoint i8* %last4 to i32
+ %cmp = icmp ne i32 %last.int, %first.int
+ ret i1 %cmp
+}
+
+define i1 @gep10(i8* %ptr) {
+; CHECK: @gep10
+; CHECK-NOT: ret
+; CHECK: ret i1 true
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 -2
+ %first2 = getelementptr inbounds i8* %first1, i32 44
+ %last1 = getelementptr inbounds i8* %ptr, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 -6
+ %first.int = ptrtoint i8* %first2 to i32
+ %last.int = ptrtoint i8* %last2 to i32
+ %cmp = icmp eq i32 %last.int, %first.int
+ ret i1 %cmp
+}
+
+define i1 @gep11(i8* %ptr) {
+; CHECK: @gep11
+; CHECK-NOT: ret
+; CHECK: ret i1 true
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 -2
+ %last1 = getelementptr inbounds i8* %ptr, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 -6
+ %cmp = icmp ult i8* %first1, %last2
+ ret i1 %cmp
+}
+
+define i1 @gep12(i8* %ptr) {
+; CHECK: @gep12
+; CHECK-NOT: ret
+; CHECK: ret i1 %cmp
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 -2
+ %last1 = getelementptr inbounds i8* %ptr, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 -6
+ %cmp = icmp slt i8* %first1, %last2
+ ret i1 %cmp
+}
+
+define i1 @gep13(i8* %ptr) {
+; CHECK: @gep13
+; We can prove this GEP is non-null because it is inbounds.
+ %x = getelementptr inbounds i8* %ptr, i32 1
+ %cmp = icmp eq i8* %x, null
+ ret i1 %cmp
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep14({ {}, i8 }* %ptr) {
+; CHECK: @gep14
+; We can't simplify this because the offset of one in the GEP actually doesn't
+; move the pointer.
+ %x = getelementptr inbounds { {}, i8 }* %ptr, i32 0, i32 1
+ %cmp = icmp eq i8* %x, null
+ ret i1 %cmp
+; CHECK-NOT: ret i1 false
+}
+
+define i1 @gep15({ {}, [4 x {i8, i8}]}* %ptr, i32 %y) {
+; CHECK: @gep15
+; We can prove this GEP is non-null even though there is a user value, as we
+; would necessarily violate inbounds on one side or the other.
+ %x = getelementptr inbounds { {}, [4 x {i8, i8}]}* %ptr, i32 0, i32 1, i32 %y, i32 1
+ %cmp = icmp eq i8* %x, null
+ ret i1 %cmp
+; CHECK-NEXT: ret i1 false
+}
+
+define i1 @gep16(i8* %ptr, i32 %a) {
+; CHECK: @gep16
+; We can prove this GEP is non-null because it is inbounds and because we know
+; %b is non-zero even though we don't know its value.
+ %b = or i32 %a, 1
+ %x = getelementptr inbounds i8* %ptr, i32 %b
+ %cmp = icmp eq i8* %x, null
+ ret i1 %cmp
+; CHECK-NEXT: ret i1 false
+}
+
define i1 @zext(i32 %x) {
; CHECK: @zext
%e1 = zext i32 %x to i64
; CHECK: ret i1 true
}
+define i1 @add6(i64 %A, i64 %B) {
+; CHECK: @add6
+ %s1 = add i64 %A, %B
+ %s2 = add i64 %B, %A
+ %cmp = icmp eq i64 %s1, %s2
+ ret i1 %cmp
+; CHECK: ret i1 true
+}
+
define i1 @addpowtwo(i32 %x, i32 %y) {
; CHECK: @addpowtwo
%l = lshr i32 %x, 1
; CHECK: ret i1 false
}
-define i1 @lshr(i32 %x) {
-; CHECK: @lshr
+define i1 @lshr1(i32 %x) {
+; CHECK: @lshr1
%s = lshr i32 -1, %x
%c = icmp eq i32 %s, 0
ret i1 %c
; CHECK: ret i1 false
}
-define i1 @ashr(i32 %x) {
-; CHECK: @ashr
+define i1 @lshr2(i32 %x) {
+; CHECK: @lshr2
+ %s = lshr i32 %x, 30
+ %c = icmp ugt i32 %s, 8
+ ret i1 %c
+; CHECK: ret i1 false
+}
+
+define i1 @lshr3(i32 %x) {
+; CHECK: @lshr3
+ %s = lshr i32 %x, %x
+ %c = icmp eq i32 %s, 0
+ ret i1 %c
+; CHECK: ret i1 true
+}
+
+define i1 @ashr1(i32 %x) {
+; CHECK: @ashr1
%s = ashr i32 -1, %x
%c = icmp eq i32 %s, 0
ret i1 %c
; CHECK: ret i1 false
}
+define i1 @ashr2(i32 %x) {
+; CHECK: @ashr2
+ %s = ashr i32 %x, 30
+ %c = icmp slt i32 %s, -5
+ ret i1 %c
+; CHECK: ret i1 false
+}
+
+define i1 @ashr3(i32 %x) {
+; CHECK: @ashr3
+ %s = ashr i32 %x, %x
+ %c = icmp eq i32 %s, 0
+ ret i1 %c
+; CHECK: ret i1 true
+}
+
define i1 @select1(i1 %cond) {
; CHECK: @select1
%s = select i1 %cond, i32 1, i32 0
; CHECK: ret i1 %cond
}
+define i1 @select5(i32 %x) {
+; CHECK: @select5
+ %c = icmp eq i32 %x, 0
+ %s = select i1 %c, i32 1, i32 %x
+ %c2 = icmp eq i32 %s, 0
+ ret i1 %c2
+; CHECK: ret i1 false
+}
+
+define i1 @select6(i32 %x) {
+; CHECK: @select6
+ %c = icmp sgt i32 %x, 0
+ %s = select i1 %c, i32 %x, i32 4
+ %c2 = icmp eq i32 %s, 0
+ ret i1 %c2
+; CHECK: ret i1 %c2
+}
+
define i1 @urem1(i32 %X, i32 %Y) {
; CHECK: @urem1
%A = urem i32 %X, %Y
%A = urem i32 %X, %Y
%B = icmp eq i32 %A, %Y
ret i1 %B
-; CHECK ret i1 false
+; CHECK: ret i1 false
+}
+
+define i1 @urem3(i32 %X) {
+; CHECK: @urem3
+ %A = urem i32 %X, 10
+ %B = icmp ult i32 %A, 15
+ ret i1 %B
+; CHECK: ret i1 true
+}
+
+define i1 @urem4(i32 %X) {
+; CHECK: @urem4
+ %A = urem i32 %X, 15
+ %B = icmp ult i32 %A, 10
+ ret i1 %B
+; CHECK: ret i1 %B
+}
+
+define i1 @urem5(i16 %X, i32 %Y) {
+; CHECK: @urem5
+ %A = zext i16 %X to i32
+ %B = urem i32 %A, %Y
+ %C = icmp slt i32 %B, %Y
+ ret i1 %C
+; CHECK-NOT: ret i1 true
+}
+
+define i1 @urem6(i32 %X, i32 %Y) {
+; CHECK: @urem6
+ %A = urem i32 %X, %Y
+ %B = icmp ugt i32 %Y, %A
+ ret i1 %B
+; CHECK: ret i1 true
+}
+
+define i1 @urem7(i32 %X) {
+; CHECK: @urem7
+ %A = urem i32 1, %X
+ %B = icmp sgt i32 %A, %X
+ ret i1 %B
+; CHECK-NOT: ret i1 false
+}
+
+define i1 @srem1(i32 %X) {
+; CHECK: @srem1
+ %A = srem i32 %X, -5
+ %B = icmp sgt i32 %A, 5
+ ret i1 %B
+; CHECK: ret i1 false
+}
+
+; PR9343 #15
+; CHECK: @srem2
+; CHECK: ret i1 false
+define i1 @srem2(i16 %X, i32 %Y) {
+ %A = zext i16 %X to i32
+ %B = add nsw i32 %A, 1
+ %C = srem i32 %B, %Y
+ %D = icmp slt i32 %C, 0
+ ret i1 %D
+}
+
+; CHECK: @srem3
+; CHECK-NEXT: ret i1 false
+define i1 @srem3(i16 %X, i32 %Y) {
+ %A = zext i16 %X to i32
+ %B = or i32 2147483648, %A
+ %C = sub nsw i32 1, %B
+ %D = srem i32 %C, %Y
+ %E = icmp slt i32 %D, 0
+ ret i1 %E
+}
+
+define i1 @udiv1(i32 %X) {
+; CHECK: @udiv1
+ %A = udiv i32 %X, 1000000
+ %B = icmp ult i32 %A, 5000
+ ret i1 %B
+; CHECK: ret i1 true
+}
+
+define i1 @udiv2(i32 %X, i32 %Y, i32 %Z) {
+; CHECK: @udiv2
+ %A = udiv exact i32 10, %Z
+ %B = udiv exact i32 20, %Z
+ %C = icmp ult i32 %A, %B
+ ret i1 %C
+; CHECK: ret i1 true
+}
+
+define i1 @udiv3(i32 %X, i32 %Y) {
+; CHECK: @udiv3
+ %A = udiv i32 %X, %Y
+ %C = icmp ugt i32 %A, %X
+ ret i1 %C
+; CHECK: ret i1 false
+}
+
+define i1 @udiv4(i32 %X, i32 %Y) {
+; CHECK: @udiv4
+ %A = udiv i32 %X, %Y
+ %C = icmp ule i32 %A, %X
+ ret i1 %C
+; CHECK: ret i1 true
+}
+
+define i1 @udiv5(i32 %X) {
+; CHECK: @udiv5
+ %A = udiv i32 123, %X
+ %C = icmp ugt i32 %A, 124
+ ret i1 %C
+; CHECK: ret i1 false
+}
+
+; PR11340
+define i1 @udiv6(i32 %X) nounwind {
+; CHECK: @udiv6
+ %A = udiv i32 1, %X
+ %C = icmp eq i32 %A, 0
+ ret i1 %C
+; CHECK: ret i1 %C
+}
+
+
+define i1 @sdiv1(i32 %X) {
+; CHECK: @sdiv1
+ %A = sdiv i32 %X, 1000000
+ %B = icmp slt i32 %A, 3000
+ ret i1 %B
+; CHECK: ret i1 true
+}
+
+define i1 @or1(i32 %X) {
+; CHECK: @or1
+ %A = or i32 %X, 62
+ %B = icmp ult i32 %A, 50
+ ret i1 %B
+; CHECK: ret i1 false
+}
+
+define i1 @and1(i32 %X) {
+; CHECK: @and1
+ %A = and i32 %X, 62
+ %B = icmp ugt i32 %A, 70
+ ret i1 %B
+; CHECK: ret i1 false
+}
+
+define i1 @mul1(i32 %X) {
+; CHECK: @mul1
+; Square of a non-zero number is non-zero if there is no overflow.
+ %Y = or i32 %X, 1
+ %M = mul nuw i32 %Y, %Y
+ %C = icmp eq i32 %M, 0
+ ret i1 %C
+; CHECK: ret i1 false
+}
+
+define i1 @mul2(i32 %X) {
+; CHECK: @mul2
+; Square of a non-zero number is positive if there is no signed overflow.
+ %Y = or i32 %X, 1
+ %M = mul nsw i32 %Y, %Y
+ %C = icmp sgt i32 %M, 0
+ ret i1 %C
+; CHECK: ret i1 true
+}
+
+define i1 @mul3(i32 %X, i32 %Y) {
+; CHECK: @mul3
+; Product of non-negative numbers is non-negative if there is no signed overflow.
+ %XX = mul nsw i32 %X, %X
+ %YY = mul nsw i32 %Y, %Y
+ %M = mul nsw i32 %XX, %YY
+ %C = icmp sge i32 %M, 0
+ ret i1 %C
+; CHECK: ret i1 true
+}
+
+define <2 x i1> @vectorselect1(<2 x i1> %cond) {
+; CHECK: @vectorselect1
+ %invert = xor <2 x i1> %cond, <i1 1, i1 1>
+ %s = select <2 x i1> %invert, <2 x i32> <i32 0, i32 0>, <2 x i32> <i32 1, i32 1>
+ %c = icmp ne <2 x i32> %s, <i32 0, i32 0>
+ ret <2 x i1> %c
+; CHECK: ret <2 x i1> %cond
+}
+
+; PR11948
+define <2 x i1> @vectorselectcrash(i32 %arg1) {
+ %tobool40 = icmp ne i32 %arg1, 0
+ %cond43 = select i1 %tobool40, <2 x i16> <i16 -5, i16 66>, <2 x i16> <i16 46, i16 1>
+ %cmp45 = icmp ugt <2 x i16> %cond43, <i16 73, i16 21>
+ ret <2 x i1> %cmp45
+}
+
+; PR12013
+define i1 @alloca_compare(i64 %idx) {
+ %sv = alloca { i32, i32, [124 x i32] }
+ %1 = getelementptr inbounds { i32, i32, [124 x i32] }* %sv, i32 0, i32 2, i64 %idx
+ %2 = icmp eq i32* %1, null
+ ret i1 %2
+ ; CHECK: alloca_compare
+ ; CHECK: ret i1 false
+}
+
+; PR12075
+define i1 @infinite_gep() {
+ ret i1 1
+
+unreachableblock:
+ %X = getelementptr i32 *%X, i32 1
+ %Y = icmp eq i32* %X, null
+ ret i1 %Y
+}
+
+; It's not valid to fold a comparison of an argument with an alloca, even though
+; that's tempting. An argument can't *alias* an alloca, however the aliasing rule
+; relies on restrictions against guessing an object's address and dereferencing.
+; There are no restrictions against guessing an object's address and comparing.
+
+define i1 @alloca_argument_compare(i64* %arg) {
+ %alloc = alloca i64
+ %cmp = icmp eq i64* %arg, %alloc
+ ret i1 %cmp
+ ; CHECK: alloca_argument_compare
+ ; CHECK: ret i1 %cmp
+}
+
+; As above, but with the operands reversed.
+
+define i1 @alloca_argument_compare_swapped(i64* %arg) {
+ %alloc = alloca i64
+ %cmp = icmp eq i64* %alloc, %arg
+ ret i1 %cmp
+ ; CHECK: alloca_argument_compare_swapped
+ ; CHECK: ret i1 %cmp
+}
+
+; Don't assume that a noalias argument isn't equal to a global variable's
+; address. This is an example where AliasAnalysis' NoAlias concept is
+; different from actual pointer inequality.
+
+@y = external global i32
+define zeroext i1 @external_compare(i32* noalias %x) {
+ %cmp = icmp eq i32* %x, @y
+ ret i1 %cmp
+ ; CHECK: external_compare
+ ; CHECK: ret i1 %cmp
+}
+
+define i1 @alloca_gep(i64 %a, i64 %b) {
+; CHECK: @alloca_gep
+; We can prove this GEP is non-null because it is inbounds and the pointer
+; is non-null.
+ %strs = alloca [1000 x [1001 x i8]], align 16
+ %x = getelementptr inbounds [1000 x [1001 x i8]]* %strs, i64 0, i64 %a, i64 %b
+ %cmp = icmp eq i8* %x, null
+ ret i1 %cmp
+; CHECK-NEXT: ret i1 false
}
projects / oota-llvm.git / blobdiff