83 lines
2.1 KiB
LLVM
83 lines
2.1 KiB
LLVM
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; Test the three-operand form of 32-bit subtraction.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
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declare i32 @foo(i32, i32, i32)
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; Check SLRK.
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define i32 @f1(i32 %dummy, i32 %a, i32 %b, i32 *%flag) {
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; CHECK-LABEL: f1:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: afi [[REG]], -536870912
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; CHECK: srl [[REG]], 31
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; CHECK: st [[REG]], 0(%r5)
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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%ext = zext i1 %obit to i32
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store i32 %ext, i32 *%flag
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ret i32 %val
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}
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; Check using the overflow result for a branch.
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define i32 @f2(i32 %dummy, i32 %a, i32 %b) {
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; CHECK-LABEL: f2:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK-NEXT: bnler %r14
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; CHECK: lhi %r2, 0
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; CHECK: jg foo@PLT
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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br i1 %obit, label %call, label %exit
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call:
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%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
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ret i32 %res
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exit:
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ret i32 %val
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}
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; ... and the same with the inverted direction.
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define i32 @f3(i32 %dummy, i32 %a, i32 %b) {
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; CHECK-LABEL: f3:
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; CHECK: slrk %r2, %r3, %r4
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; CHECK-NEXT: bler %r14
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; CHECK: lhi %r2, 0
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; CHECK: jg foo@PLT
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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br i1 %obit, label %exit, label %call
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call:
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%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
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ret i32 %res
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exit:
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ret i32 %val
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}
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; Check that we can still use SLR in obvious cases.
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define i32 @f4(i32 %a, i32 %b, i32 *%flag) {
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; CHECK-LABEL: f4:
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; CHECK: slr %r2, %r3
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: afi [[REG]], -536870912
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; CHECK: srl [[REG]], 31
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; CHECK: st [[REG]], 0(%r4)
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; CHECK: br %r14
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%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
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%val = extractvalue {i32, i1} %t, 0
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%obit = extractvalue {i32, i1} %t, 1
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%ext = zext i1 %obit to i32
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store i32 %ext, i32 *%flag
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ret i32 %val
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}
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declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) nounwind readnone
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