--- /dev/null
+; RUN: opt -S -instcombine < %s | FileCheck %s
+
+; CHECK-LABEL: @t1
+; CHECK-NEXT: icmp
+; CHECK-NEXT: select
+; CHECK-NEXT: sext
+define i64 @t1(i32 %a) {
+ ; This is the canonical form for a type-changing min/max.
+ %1 = icmp slt i32 %a, 5
+ %2 = select i1 %1, i32 %a, i32 5
+ %3 = sext i32 %2 to i64
+ ret i64 %3
+}
+
+; CHECK-LABEL: @t2
+; CHECK-NEXT: icmp
+; CHECK-NEXT: select
+; CHECK-NEXT: sext
+define i64 @t2(i32 %a) {
+ ; Check this is converted into canonical form, as above.
+ %1 = icmp slt i32 %a, 5
+ %2 = sext i32 %a to i64
+ %3 = select i1 %1, i64 %2, i64 5
+ ret i64 %3
+}
+
+; CHECK-LABEL: @t3
+; CHECK-NEXT: icmp
+; CHECK-NEXT: select
+; CHECK-NEXT: zext
+define i64 @t3(i32 %a) {
+ ; Same as @t2, with flipped operands and zext instead of sext.
+ %1 = icmp ult i32 %a, 5
+ %2 = zext i32 %a to i64
+ %3 = select i1 %1, i64 5, i64 %2
+ ret i64 %3
+}
+
+; CHECK-LABEL: @t4
+; CHECK-NEXT: icmp
+; CHECK-NEXT: select
+; CHECK-NEXT: trunc
+define i32 @t4(i64 %a) {
+ ; Same again, with trunc.
+ %1 = icmp slt i64 %a, 5
+ %2 = trunc i64 %a to i32
+ %3 = select i1 %1, i32 %2, i32 5
+ ret i32 %3
+}
+
+; CHECK-LABEL: @t5
+; CHECK-NEXT: icmp
+; CHECK-NEXT: zext
+; CHECK-NEXT: select
+define i64 @t5(i32 %a) {
+ ; Same as @t3, but with mismatched signedness between icmp and zext.
+ ; InstCombine should leave this alone.
+ %1 = icmp slt i32 %a, 5
+ %2 = zext i32 %a to i64
+ %3 = select i1 %1, i64 5, i64 %2
+ ret i64 %3
+}
+
+; CHECK-LABEL: @t6
+; CHECK-NEXT: icmp
+; CHECK-NEXT: select
+; CHECK-NEXT: sitofp
+define float @t6(i32 %a) {
+ %1 = icmp slt i32 %a, 0
+ %2 = select i1 %1, i32 %a, i32 0
+ %3 = sitofp i32 %2 to float
+ ret float %3
+}
+
+; CHECK-LABEL: @t7
+; CHECK-NEXT: icmp
+; CHECK-NEXT: select
+; CHECK-NEXT: trunc
+define i16 @t7(i32 %a) {
+ %1 = icmp slt i32 %a, -32768
+ %2 = trunc i32 %a to i16
+ %3 = select i1 %1, i16 %2, i16 -32768
+ ret i16 %3
+}
+
+; Just check for no infinite loop. InstSimplify liked to
+; "simplify" -32767 by removing all the sign bits,
+; which led to a canonicalization fight between different
+; parts of instcombine.
+define i32 @t8(i64 %a, i32 %b) {
+ %1 = icmp slt i64 %a, -32767
+ %2 = select i1 %1, i64 %a, i64 -32767
+ %3 = trunc i64 %2 to i32
+ %4 = icmp slt i32 %b, 42
+ %5 = select i1 %4, i32 42, i32 %3
+ %6 = icmp ne i32 %5, %b
+ %7 = zext i1 %6 to i32
+ ret i32 %7
+}