diff options
Diffstat (limited to 'test/Transforms/InstCombine/div-shift.ll')
| -rw-r--r-- | test/Transforms/InstCombine/div-shift.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/div-shift.ll b/test/Transforms/InstCombine/div-shift.ll index e0372ebac184f..3350f1940554a 100644 --- a/test/Transforms/InstCombine/div-shift.ll +++ b/test/Transforms/InstCombine/div-shift.ll @@ -35,3 +35,41 @@ define i64 @t3(i64 %x, i32 %y) nounwind { %3 = udiv i64 %x, %2 ret i64 %3 } + +define i32 @t4(i32 %x, i32 %y) nounwind { +; CHECK: t4 +; CHECK-NOT: udiv +; CHECK-NEXT: [[CMP:%.*]] = icmp ult i32 %y, 5 +; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP]], i32 5, i32 %y +; CHECK-NEXT: [[SHR:%.*]] = lshr i32 %x, [[SEL]] +; CHECK-NEXT: ret i32 [[SHR]] + %1 = shl i32 1, %y + %2 = icmp ult i32 %1, 32 + %3 = select i1 %2, i32 32, i32 %1 + %4 = udiv i32 %x, %3 + ret i32 %4 +} + +define i32 @t5(i1 %x, i1 %y, i32 %V) nounwind { +; CHECK: t5 +; CHECK-NOT: udiv +; CHECK-NEXT: [[SEL1:%.*]] = select i1 %x, i32 5, i32 6 +; CHECK-NEXT: [[LSHR:%.*]] = lshr i32 %V, [[SEL1]] +; CHECK-NEXT: [[SEL2:%.*]] = select i1 %y, i32 [[LSHR]], i32 0 +; CHECK-NEXT: ret i32 [[SEL2]] + %1 = shl i32 1, %V + %2 = select i1 %x, i32 32, i32 64 + %3 = select i1 %y, i32 %2, i32 %1 + %4 = udiv i32 %V, %3 + ret i32 %4 +} + +define i32 @t6(i32 %x, i32 %z) nounwind{ +; CHECK: t6 +; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 %x, 0 +; CHECK-NOT: udiv i32 %z, %x + %x_is_zero = icmp eq i32 %x, 0 + %divisor = select i1 %x_is_zero, i32 1, i32 %x + %y = udiv i32 %z, %divisor + ret i32 %y +} |