| Ulrich Weigand | c3ec80f | 2018-04-30 17:54:28 +0000 | [diff] [blame] | 1 | ; Test 32-bit subtraction in which the second operand is constant. |
| 2 | ; |
| 3 | ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s |
| 4 | |
| 5 | declare i32 @foo() |
| 6 | |
| 7 | ; Check subtraction of 1. |
| 8 | define zeroext i1 @f1(i32 %dummy, i32 %a, i32 *%res) { |
| 9 | ; CHECK-LABEL: f1: |
| 10 | ; CHECK: slfi %r3, 1 |
| 11 | ; CHECK-DAG: st %r3, 0(%r4) |
| 12 | ; CHECK-DAG: ipm [[REG:%r[0-5]]] |
| 13 | ; CHECK-DAG: afi [[REG]], -536870912 |
| 14 | ; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33 |
| 15 | ; CHECK: br %r14 |
| 16 | %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1) |
| 17 | %val = extractvalue {i32, i1} %t, 0 |
| 18 | %obit = extractvalue {i32, i1} %t, 1 |
| 19 | store i32 %val, i32 *%res |
| 20 | ret i1 %obit |
| 21 | } |
| 22 | |
| 23 | ; Check the high end of the SLFI range. |
| 24 | define zeroext i1 @f2(i32 %dummy, i32 %a, i32 *%res) { |
| 25 | ; CHECK-LABEL: f2: |
| 26 | ; CHECK: slfi %r3, 4294967295 |
| 27 | ; CHECK-DAG: st %r3, 0(%r4) |
| 28 | ; CHECK-DAG: ipm [[REG:%r[0-5]]] |
| 29 | ; CHECK-DAG: afi [[REG]], -536870912 |
| 30 | ; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33 |
| 31 | ; CHECK: br %r14 |
| 32 | %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 4294967295) |
| 33 | %val = extractvalue {i32, i1} %t, 0 |
| 34 | %obit = extractvalue {i32, i1} %t, 1 |
| 35 | store i32 %val, i32 *%res |
| 36 | ret i1 %obit |
| 37 | } |
| 38 | |
| 39 | ; Check that negative values are treated as unsigned |
| 40 | define zeroext i1 @f3(i32 %dummy, i32 %a, i32 *%res) { |
| 41 | ; CHECK-LABEL: f3: |
| 42 | ; CHECK: slfi %r3, 4294967295 |
| 43 | ; CHECK-DAG: st %r3, 0(%r4) |
| 44 | ; CHECK-DAG: ipm [[REG:%r[0-5]]] |
| 45 | ; CHECK-DAG: afi [[REG]], -536870912 |
| 46 | ; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33 |
| 47 | ; CHECK: br %r14 |
| 48 | %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 -1) |
| 49 | %val = extractvalue {i32, i1} %t, 0 |
| 50 | %obit = extractvalue {i32, i1} %t, 1 |
| 51 | store i32 %val, i32 *%res |
| 52 | ret i1 %obit |
| 53 | } |
| 54 | |
| 55 | ; Check using the overflow result for a branch. |
| 56 | define void @f4(i32 %dummy, i32 %a, i32 *%res) { |
| 57 | ; CHECK-LABEL: f4: |
| 58 | ; CHECK: slfi %r3, 1 |
| 59 | ; CHECK: st %r3, 0(%r4) |
| 60 | ; CHECK: jgle foo@PLT |
| 61 | ; CHECK: br %r14 |
| 62 | %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1) |
| 63 | %val = extractvalue {i32, i1} %t, 0 |
| 64 | %obit = extractvalue {i32, i1} %t, 1 |
| 65 | store i32 %val, i32 *%res |
| 66 | br i1 %obit, label %call, label %exit |
| 67 | |
| 68 | call: |
| 69 | tail call i32 @foo() |
| 70 | br label %exit |
| 71 | |
| 72 | exit: |
| 73 | ret void |
| 74 | } |
| 75 | |
| 76 | ; ... and the same with the inverted direction. |
| 77 | define void @f5(i32 %dummy, i32 %a, i32 *%res) { |
| 78 | ; CHECK-LABEL: f5: |
| 79 | ; CHECK: slfi %r3, 1 |
| 80 | ; CHECK: st %r3, 0(%r4) |
| 81 | ; CHECK: jgnle foo@PLT |
| 82 | ; CHECK: br %r14 |
| 83 | %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1) |
| 84 | %val = extractvalue {i32, i1} %t, 0 |
| 85 | %obit = extractvalue {i32, i1} %t, 1 |
| 86 | store i32 %val, i32 *%res |
| 87 | br i1 %obit, label %exit, label %call |
| 88 | |
| 89 | call: |
| 90 | tail call i32 @foo() |
| 91 | br label %exit |
| 92 | |
| 93 | exit: |
| 94 | ret void |
| 95 | } |
| 96 | |
| 97 | declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) nounwind readnone |
| 98 | |