| ; 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 |
| } |
| |
| ; Ensure this doesn't get converted to a min/max. |
| ; CHECK-LABEL: @t9 |
| ; CHECK-NEXT: icmp |
| ; CHECK-NEXT: sext |
| ; CHECK-NEXT: 4294967295 |
| ; CHECK-NEXT: ret |
| define i64 @t9(i32 %a) { |
| %1 = icmp sgt i32 %a, -1 |
| %2 = sext i32 %a to i64 |
| %3 = select i1 %1, i64 %2, i64 4294967295 |
| ret i64 %3 |
| } |