| Richard Sandiford | 7d86e47 | 2013-08-21 09:34:56 +0000 | [diff] [blame] | 1 | ; Test that divisions by constants are implemented as multiplications. |
| 2 | ; |
| 3 | ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s |
| 4 | |
| 5 | ; Check signed 32-bit division. |
| 6 | define i32 @f1(i32 %a) { |
| 7 | ; CHECK-LABEL: f1: |
| 8 | ; CHECK: lgfr [[REG:%r[0-5]]], %r2 |
| 9 | ; CHECK: msgfi [[REG]], 502748801 |
| 10 | ; CHECK-DAG: srlg [[RES1:%r[0-5]]], [[REG]], 63 |
| 11 | ; CHECK-DAG: srag %r2, [[REG]], 46 |
| 12 | ; CHECK: ar %r2, [[RES1]] |
| 13 | ; CHECK: br %r14 |
| 14 | %b = sdiv i32 %a, 139968 |
| 15 | ret i32 %b |
| 16 | } |
| 17 | |
| 18 | ; Check unsigned 32-bit division. |
| 19 | define i32 @f2(i32 %a) { |
| 20 | ; CHECK-LABEL: f2: |
| 21 | ; CHECK: llgfr [[REG:%r[0-5]]], %r2 |
| 22 | ; CHECK: msgfi [[REG]], 502748801 |
| 23 | ; CHECK: srlg %r2, [[REG]], 46 |
| 24 | ; CHECK: br %r14 |
| 25 | %b = udiv i32 %a, 139968 |
| 26 | ret i32 %b |
| 27 | } |
| 28 | |
| 29 | ; Check signed 64-bit division. |
| 30 | define i64 @f3(i64 %dummy, i64 %a) { |
| 31 | ; CHECK-LABEL: f3: |
| 32 | ; CHECK-DAG: llihf [[CONST:%r[0-5]]], 1005497601 |
| 33 | ; CHECK-DAG: oilf [[CONST]], 4251762321 |
| 34 | ; CHECK-DAG: srag [[REG:%r[0-5]]], %r3, 63 |
| 35 | ; CHECK-DAG: ngr [[REG]], [[CONST]] |
| 36 | ; CHECK-DAG: mlgr %r2, [[CONST]] |
| 37 | ; CHECK: sgr %r2, [[REG]] |
| 38 | ; CHECK: srlg [[RES1:%r[0-5]]], %r2, 63 |
| 39 | ; CHECK: srag %r2, %r2, 15 |
| 40 | ; CHECK: agr %r2, [[RES1]] |
| 41 | ; CHECK: br %r14 |
| 42 | %b = sdiv i64 %a, 139968 |
| 43 | ret i64 %b |
| 44 | } |
| 45 | |
| 46 | ; Check unsigned 64-bit division. |
| 47 | define i64 @f4(i64 %dummy, i64 %a) { |
| 48 | ; CHECK-LABEL: f4: |
| 49 | ; CHECK: llihf [[CONST:%r[0-5]]], 1005497601 |
| 50 | ; CHECK: oilf [[CONST]], 4251762321 |
| 51 | ; CHECK: mlgr %r2, [[CONST]] |
| 52 | ; CHECK: srlg %r2, %r2, 15 |
| 53 | ; CHECK: br %r14 |
| 54 | %b = udiv i64 %a, 139968 |
| 55 | ret i64 %b |
| 56 | } |