1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3 2; Test 32-bit subtraction in which the second operand is constant. 3; 4; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s 5 6declare i32 @foo() 7 8; Check subtraction of 1. 9define zeroext i1 @f1(i32 %dummy, i32 %a, ptr %res) { 10; CHECK-LABEL: f1: 11; CHECK: # %bb.0: 12; CHECK-NEXT: slfi %r3, 1 13; CHECK-NEXT: ipm %r0 14; CHECK-NEXT: afi %r0, -536870912 15; CHECK-NEXT: risbg %r2, %r0, 63, 191, 33 16; CHECK-NEXT: st %r3, 0(%r4) 17; CHECK-NEXT: br %r14 18 %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1) 19 %val = extractvalue {i32, i1} %t, 0 20 %obit = extractvalue {i32, i1} %t, 1 21 store i32 %val, ptr %res 22 ret i1 %obit 23} 24 25; Check the high end of the SLFI range. 26define zeroext i1 @f2(i32 %dummy, i32 %a, ptr %res) { 27; CHECK-LABEL: f2: 28; CHECK: # %bb.0: 29; CHECK-NEXT: slfi %r3, 4294967295 30; CHECK-NEXT: ipm %r0 31; CHECK-NEXT: afi %r0, -536870912 32; CHECK-NEXT: risbg %r2, %r0, 63, 191, 33 33; CHECK-NEXT: st %r3, 0(%r4) 34; CHECK-NEXT: br %r14 35 %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 4294967295) 36 %val = extractvalue {i32, i1} %t, 0 37 %obit = extractvalue {i32, i1} %t, 1 38 store i32 %val, ptr %res 39 ret i1 %obit 40} 41 42; Check that negative values are treated as unsigned 43define zeroext i1 @f3(i32 %dummy, i32 %a, ptr %res) { 44; CHECK-LABEL: f3: 45; CHECK: # %bb.0: 46; CHECK-NEXT: slfi %r3, 4294967295 47; CHECK-NEXT: ipm %r0 48; CHECK-NEXT: afi %r0, -536870912 49; CHECK-NEXT: risbg %r2, %r0, 63, 191, 33 50; CHECK-NEXT: st %r3, 0(%r4) 51; CHECK-NEXT: br %r14 52 %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 -1) 53 %val = extractvalue {i32, i1} %t, 0 54 %obit = extractvalue {i32, i1} %t, 1 55 store i32 %val, ptr %res 56 ret i1 %obit 57} 58 59; Check using the overflow result for a branch. 60define void @f4(i32 %dummy, i32 %a, ptr %res) { 61; CHECK-LABEL: f4: 62; CHECK: # %bb.0: 63; CHECK-NEXT: slfi %r3, 1 64; CHECK-NEXT: st %r3, 0(%r4) 65; CHECK-NEXT: jgle foo@PLT 66; CHECK-NEXT: .LBB3_1: # %exit 67; CHECK-NEXT: br %r14 68 %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1) 69 %val = extractvalue {i32, i1} %t, 0 70 %obit = extractvalue {i32, i1} %t, 1 71 store i32 %val, ptr %res 72 br i1 %obit, label %call, label %exit 73 74call: 75 tail call i32 @foo() 76 br label %exit 77 78exit: 79 ret void 80} 81 82; ... and the same with the inverted direction. 83define void @f5(i32 %dummy, i32 %a, ptr %res) { 84; CHECK-LABEL: f5: 85; CHECK: # %bb.0: 86; CHECK-NEXT: slfi %r3, 1 87; CHECK-NEXT: st %r3, 0(%r4) 88; CHECK-NEXT: jgnle foo@PLT 89; CHECK-NEXT: .LBB4_1: # %exit 90; CHECK-NEXT: br %r14 91 %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1) 92 %val = extractvalue {i32, i1} %t, 0 93 %obit = extractvalue {i32, i1} %t, 1 94 store i32 %val, ptr %res 95 br i1 %obit, label %exit, label %call 96 97call: 98 tail call i32 @foo() 99 br label %exit 100 101exit: 102 ret void 103} 104 105declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) nounwind readnone 106 107