int-usub-06.ll
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; Test the three-operand form of 32-bit subtraction.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
declare i32 @foo(i32, i32, i32)
; Check SLRK.
define i32 @f1(i32 %dummy, i32 %a, i32 %b, i32 *%flag) {
; CHECK-LABEL: f1:
; CHECK: slrk %r2, %r3, %r4
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], -536870912
; CHECK: srl [[REG]], 31
; CHECK: st [[REG]], 0(%r5)
; CHECK: br %r14
%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
%ext = zext i1 %obit to i32
store i32 %ext, i32 *%flag
ret i32 %val
}
; Check using the overflow result for a branch.
define i32 @f2(i32 %dummy, i32 %a, i32 %b) {
; CHECK-LABEL: f2:
; CHECK: slrk %r2, %r3, %r4
; CHECK-NEXT: bnler %r14
; CHECK: lhi %r2, 0
; CHECK: jg foo@PLT
%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
br i1 %obit, label %call, label %exit
call:
%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
ret i32 %res
exit:
ret i32 %val
}
; ... and the same with the inverted direction.
define i32 @f3(i32 %dummy, i32 %a, i32 %b) {
; CHECK-LABEL: f3:
; CHECK: slrk %r2, %r3, %r4
; CHECK-NEXT: bler %r14
; CHECK: lhi %r2, 0
; CHECK: jg foo@PLT
%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
br i1 %obit, label %exit, label %call
call:
%res = tail call i32 @foo(i32 0, i32 %a, i32 %b)
ret i32 %res
exit:
ret i32 %val
}
; Check that we can still use SLR in obvious cases.
define i32 @f4(i32 %a, i32 %b, i32 *%flag) {
; CHECK-LABEL: f4:
; CHECK: slr %r2, %r3
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], -536870912
; CHECK: srl [[REG]], 31
; CHECK: st [[REG]], 0(%r4)
; CHECK: br %r14
%t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %a, i32 %b)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
%ext = zext i1 %obit to i32
store i32 %ext, i32 *%flag
ret i32 %val
}
declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32) nounwind readnone