| ; RUN: opt < %s -instsimplify -S | FileCheck %s |
| target datalayout = "p:32:32" |
| |
| define i1 @ptrtoint() { |
| ; CHECK: @ptrtoint |
| %a = alloca i8 |
| %tmp = ptrtoint i8* %a to i32 |
| %r = icmp eq i32 %tmp, 0 |
| ret i1 %r |
| ; 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 |
| %e2 = zext i32 %x to i64 |
| %r = icmp eq i64 %e1, %e2 |
| ret i1 %r |
| ; CHECK: ret i1 true |
| } |
| |
| define i1 @zext2(i1 %x) { |
| ; CHECK: @zext2 |
| %e = zext i1 %x to i32 |
| %c = icmp ne i32 %e, 0 |
| ret i1 %c |
| ; CHECK: ret i1 %x |
| } |
| |
| define i1 @zext3() { |
| ; CHECK: @zext3 |
| %e = zext i1 1 to i32 |
| %c = icmp ne i32 %e, 0 |
| ret i1 %c |
| ; CHECK: ret i1 true |
| } |
| |
| define i1 @sext(i32 %x) { |
| ; CHECK: @sext |
| %e1 = sext i32 %x to i64 |
| %e2 = sext i32 %x to i64 |
| %r = icmp eq i64 %e1, %e2 |
| ret i1 %r |
| ; CHECK: ret i1 true |
| } |
| |
| define i1 @sext2(i1 %x) { |
| ; CHECK: @sext2 |
| %e = sext i1 %x to i32 |
| %c = icmp ne i32 %e, 0 |
| ret i1 %c |
| ; CHECK: ret i1 %x |
| } |
| |
| define i1 @sext3() { |
| ; CHECK: @sext3 |
| %e = sext i1 1 to i32 |
| %c = icmp ne i32 %e, 0 |
| ret i1 %c |
| ; CHECK: ret i1 true |
| } |
| |
| define i1 @add(i32 %x, i32 %y) { |
| ; CHECK: @add |
| %l = lshr i32 %x, 1 |
| %q = lshr i32 %y, 1 |
| %r = or i32 %q, 1 |
| %s = add i32 %l, %r |
| %c = icmp eq i32 %s, 0 |
| ret i1 %c |
| ; CHECK: ret i1 false |
| } |
| |
| define i1 @add2(i8 %x, i8 %y) { |
| ; CHECK: @add2 |
| %l = or i8 %x, 128 |
| %r = or i8 %y, 129 |
| %s = add i8 %l, %r |
| %c = icmp eq i8 %s, 0 |
| ret i1 %c |
| ; CHECK: ret i1 false |
| } |
| |
| define i1 @add3(i8 %x, i8 %y) { |
| ; CHECK: @add3 |
| %l = zext i8 %x to i32 |
| %r = zext i8 %y to i32 |
| %s = add i32 %l, %r |
| %c = icmp eq i32 %s, 0 |
| ret i1 %c |
| ; CHECK: ret i1 %c |
| } |
| |
| define i1 @add4(i32 %x, i32 %y) { |
| ; CHECK: @add4 |
| %z = add nsw i32 %y, 1 |
| %s1 = add nsw i32 %x, %y |
| %s2 = add nsw i32 %x, %z |
| %c = icmp slt i32 %s1, %s2 |
| ret i1 %c |
| ; CHECK: ret i1 true |
| } |
| |
| define i1 @add5(i32 %x, i32 %y) { |
| ; CHECK: @add5 |
| %z = add nuw i32 %y, 1 |
| %s1 = add nuw i32 %x, %z |
| %s2 = add nuw i32 %x, %y |
| %c = icmp ugt i32 %s1, %s2 |
| ret i1 %c |
| ; 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 |
| %r = shl i32 1, %y |
| %s = add i32 %l, %r |
| %c = icmp eq i32 %s, 0 |
| ret i1 %c |
| ; CHECK: ret i1 false |
| } |
| |
| define i1 @or(i32 %x) { |
| ; CHECK: @or |
| %o = or i32 %x, 1 |
| %c = icmp eq i32 %o, 0 |
| ret i1 %c |
| ; CHECK: ret i1 false |
| } |
| |
| define i1 @shl(i32 %x) { |
| ; CHECK: @shl |
| %s = shl i32 1, %x |
| %c = icmp eq i32 %s, 0 |
| ret i1 %c |
| ; CHECK: ret i1 false |
| } |
| |
| 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 @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 @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 @select1(i1 %cond) { |
| ; CHECK: @select1 |
| %s = select i1 %cond, i32 1, i32 0 |
| %c = icmp eq i32 %s, 1 |
| ret i1 %c |
| ; CHECK: ret i1 %cond |
| } |
| |
| define i1 @select2(i1 %cond) { |
| ; CHECK: @select2 |
| %x = zext i1 %cond to i32 |
| %s = select i1 %cond, i32 %x, i32 0 |
| %c = icmp ne i32 %s, 0 |
| ret i1 %c |
| ; CHECK: ret i1 %cond |
| } |
| |
| define i1 @select3(i1 %cond) { |
| ; CHECK: @select3 |
| %x = zext i1 %cond to i32 |
| %s = select i1 %cond, i32 1, i32 %x |
| %c = icmp ne i32 %s, 0 |
| ret i1 %c |
| ; CHECK: ret i1 %cond |
| } |
| |
| define i1 @select4(i1 %cond) { |
| ; CHECK: @select4 |
| %invert = xor i1 %cond, 1 |
| %s = select i1 %invert, i32 0, i32 1 |
| %c = icmp ne i32 %s, 0 |
| ret i1 %c |
| ; 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 |
| %B = icmp ult i32 %A, %Y |
| ret i1 %B |
| ; CHECK: ret i1 true |
| } |
| |
| define i1 @urem2(i32 %X, i32 %Y) { |
| ; CHECK: @urem2 |
| %A = urem i32 %X, %Y |
| %B = icmp eq i32 %A, %Y |
| ret i1 %B |
| ; 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: 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 @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 |
| } |