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; Test the three-operand form of 64-bit addition.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
declare i64 @foo(i64, i64, i64)
; Check SLGRK.
define i64 @f1(i64 %dummy, i64 %a, i64 %b, i64 *%flag) {
; CHECK-LABEL: f1:
; CHECK: slgrk %r2, %r3, %r4
; CHECK: ipm [[REG1:%r[0-5]]]
; CHECK: afi [[REG1]], -536870912
; CHECK: risbg [[REG2:%r[0-5]]], [[REG1]], 63, 191, 33
; CHECK: stg [[REG2]], 0(%r5)
; CHECK: br %r14
%t = call {i64, i1} @llvm.usub.with.overflow.i64(i64 %a, i64 %b)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
%ext = zext i1 %obit to i64
store i64 %ext, i64 *%flag
ret i64 %val
}
; Check using the overflow result for a branch.
define i64 @f2(i64 %dummy, i64 %a, i64 %b) {
; CHECK-LABEL: f2:
; CHECK: slgrk %r2, %r3, %r4
; CHECK-NEXT: bnler %r14
; CHECK: lghi %r2, 0
; CHECK: jg foo@PLT
%t = call {i64, i1} @llvm.usub.with.overflow.i64(i64 %a, i64 %b)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
br i1 %obit, label %call, label %exit
call:
%res = tail call i64 @foo(i64 0, i64 %a, i64 %b)
ret i64 %res
exit:
ret i64 %val
}
; ... and the same with the inverted direction.
define i64 @f3(i64 %dummy, i64 %a, i64 %b) {
; CHECK-LABEL: f3:
; CHECK: slgrk %r2, %r3, %r4
; CHECK-NEXT: bler %r14
; CHECK: lghi %r2, 0
; CHECK: jg foo@PLT
%t = call {i64, i1} @llvm.usub.with.overflow.i64(i64 %a, i64 %b)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
br i1 %obit, label %exit, label %call
call:
%res = tail call i64 @foo(i64 0, i64 %a, i64 %b)
ret i64 %res
exit:
ret i64 %val
}
; Check that we can still use SLGR in obvious cases.
define i64 @f4(i64 %a, i64 %b, i64 *%flag) {
; CHECK-LABEL: f4:
; CHECK: slgr %r2, %r3
; CHECK: ipm [[REG1:%r[0-5]]]
; CHECK: afi [[REG1]], -536870912
; CHECK: risbg [[REG2:%r[0-5]]], [[REG1]], 63, 191, 33
; CHECK: stg [[REG2]], 0(%r4)
; CHECK: br %r14
%t = call {i64, i1} @llvm.usub.with.overflow.i64(i64 %a, i64 %b)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
%ext = zext i1 %obit to i64
store i64 %ext, i64 *%flag
ret i64 %val
}
declare {i64, i1} @llvm.usub.with.overflow.i64(i64, i64) nounwind readnone
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