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99 lines
2.6 KiB
LLVM
99 lines
2.6 KiB
LLVM
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; Test 32-bit subtraction in which the second operand is constant.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare i32 @foo()
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; Check subtraction of 1.
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define zeroext i1 @f1(i32 %dummy, i32 %a, i32 *%res) {
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; CHECK-LABEL: f1:
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; CHECK: slfi %r3, 1
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; CHECK-DAG: st %r3, 0(%r4)
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; CHECK-DAG: ipm [[REG:%r[0-5]]]
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; CHECK-DAG: afi [[REG]], -536870912
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; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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store i32 %val, i32 *%res
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ret i1 %obit
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}
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; Check the high end of the SLFI range.
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define zeroext i1 @f2(i32 %dummy, i32 %a, i32 *%res) {
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; CHECK-LABEL: f2:
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; CHECK: slfi %r3, 4294967295
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; CHECK-DAG: st %r3, 0(%r4)
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; CHECK-DAG: ipm [[REG:%r[0-5]]]
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; CHECK-DAG: afi [[REG]], -536870912
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; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 4294967295)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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store i32 %val, i32 *%res
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ret i1 %obit
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}
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; Check that negative values are treated as unsigned
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define zeroext i1 @f3(i32 %dummy, i32 %a, i32 *%res) {
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; CHECK-LABEL: f3:
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; CHECK: slfi %r3, 4294967295
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; CHECK-DAG: st %r3, 0(%r4)
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; CHECK-DAG: ipm [[REG:%r[0-5]]]
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; CHECK-DAG: afi [[REG]], -536870912
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; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 -1)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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store i32 %val, i32 *%res
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ret i1 %obit
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}
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; Check using the overflow result for a branch.
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define void @f4(i32 %dummy, i32 %a, i32 *%res) {
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; CHECK-LABEL: f4:
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; CHECK: slfi %r3, 1
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; CHECK: st %r3, 0(%r4)
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; CHECK: jgle foo@PLT
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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store i32 %val, i32 *%res
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br i1 %obit, label %call, label %exit
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call:
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tail call i32 @foo()
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br label %exit
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exit:
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ret void
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}
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; ... and the same with the inverted direction.
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define void @f5(i32 %dummy, i32 %a, i32 *%res) {
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; CHECK-LABEL: f5:
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; CHECK: slfi %r3, 1
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; CHECK: st %r3, 0(%r4)
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; CHECK: jgnle foo@PLT
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 1)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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store i32 %val, i32 *%res
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br i1 %obit, label %exit, label %call
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call:
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tail call i32 @foo()
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br label %exit
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exit:
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ret void
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}
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declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) nounwind readnone
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