; 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
; 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: 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
+}