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llvm-mirror/test/CodeGen/SystemZ/int-ssub-09.ll

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[SystemZ] Handle SADDO et.al. and ADD/SUBCARRY This provides an optimized implementation of SADDO/SSUBO/UADDO/USUBO as well as ADDCARRY/SUBCARRY on top of the new CC implementation. In particular, multi-word arithmetic now uses UADDO/ADDCARRY instead of the old ADDC/ADDE logic, which means we no longer need to use "glue" links for those instructions. This also allows making full use of the memory-based instructions like ALSI, which couldn't be recognized due to limitations in the DAG matcher previously. Also, the llvm.sadd.with.overflow et.al. intrinsincs now expand to directly using the ADD instructions and checking for a CC 3 result. llvm-svn: 331203
2018-04-30 19:54:28 +02:00
; Test 64-bit subtractions of constants to memory.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
declare i64 @foo()
; Check subtraction of 1.
define zeroext i1 @f1(i64 *%ptr) {
; CHECK-LABEL: f1:
; CHECK: agsi 0(%r2), -1
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the high end of the constant range.
define zeroext i1 @f2(i64 *%ptr) {
; CHECK-LABEL: f2:
; CHECK: agsi 0(%r2), -128
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 128)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the next constant up, which must use an subtraction and a store.
define zeroext i1 @f3(i64 %dummy, i64 *%ptr) {
; CHECK-LABEL: f3:
; CHECK: lg [[VAL:%r[0-5]]], 0(%r3)
; CHECK: aghi [[VAL]], -129
; CHECK-DAG: stg [[VAL]], 0(%r3)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 129)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the low end of the constant range.
define zeroext i1 @f4(i64 *%ptr) {
; CHECK-LABEL: f4:
; CHECK: agsi 0(%r2), 127
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 -127)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the next value down, with the same comment as f3.
define zeroext i1 @f5(i64 %dummy, i64 *%ptr) {
; CHECK-LABEL: f5:
; CHECK: lg [[VAL:%r[0-5]]], 0(%r3)
; CHECK: aghi [[VAL]], 128
; CHECK-DAG: stg [[VAL]], 0(%r3)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 -128)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the high end of the aligned AGSI range.
define zeroext i1 @f6(i64 *%base) {
; CHECK-LABEL: f6:
; CHECK: agsi 524280(%r2), -1
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%ptr = getelementptr i64, i64 *%base, i64 65535
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the next word up, which must use separate address logic.
; Other sequences besides this one would be OK.
define zeroext i1 @f7(i64 *%base) {
; CHECK-LABEL: f7:
; CHECK: agfi %r2, 524288
; CHECK: agsi 0(%r2), -1
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%ptr = getelementptr i64, i64 *%base, i64 65536
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the low end of the AGSI range.
define zeroext i1 @f8(i64 *%base) {
; CHECK-LABEL: f8:
; CHECK: agsi -524288(%r2), -1
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%ptr = getelementptr i64, i64 *%base, i64 -65536
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check the next word down, which must use separate address logic.
; Other sequences besides this one would be OK.
define zeroext i1 @f9(i64 *%base) {
; CHECK-LABEL: f9:
; CHECK: agfi %r2, -524296
; CHECK: agsi 0(%r2), -1
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%ptr = getelementptr i64, i64 *%base, i64 -65537
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check that AGSI does not allow indices.
define zeroext i1 @f10(i64 %base, i64 %index) {
; CHECK-LABEL: f10:
; CHECK: agr %r2, %r3
; CHECK: agsi 4(%r2), -1
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: afi [[REG]], 1342177280
; CHECK: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%add1 = add i64 %base, %index
%add2 = add i64 %add1, 4
%ptr = inttoptr i64 %add2 to i64 *
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
ret i1 %obit
}
; Check that subtracting 128 to a spilled value can use AGSI.
define zeroext i1 @f11(i64 *%ptr, i64 %sel) {
; CHECK-LABEL: f11:
; CHECK: agsi {{[0-9]+}}(%r15), -128
; CHECK: br %r14
entry:
%val0 = load volatile i64, i64 *%ptr
%val1 = load volatile i64, i64 *%ptr
%val2 = load volatile i64, i64 *%ptr
%val3 = load volatile i64, i64 *%ptr
%val4 = load volatile i64, i64 *%ptr
%val5 = load volatile i64, i64 *%ptr
%val6 = load volatile i64, i64 *%ptr
%val7 = load volatile i64, i64 *%ptr
%val8 = load volatile i64, i64 *%ptr
%val9 = load volatile i64, i64 *%ptr
%val10 = load volatile i64, i64 *%ptr
%val11 = load volatile i64, i64 *%ptr
%val12 = load volatile i64, i64 *%ptr
%val13 = load volatile i64, i64 *%ptr
%val14 = load volatile i64, i64 *%ptr
%val15 = load volatile i64, i64 *%ptr
%test = icmp ne i64 %sel, 0
br i1 %test, label %add, label %store
add:
%t0 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val0, i64 128)
%add0 = extractvalue {i64, i1} %t0, 0
%obit0 = extractvalue {i64, i1} %t0, 1
%t1 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val1, i64 128)
%add1 = extractvalue {i64, i1} %t1, 0
%obit1 = extractvalue {i64, i1} %t1, 1
%res1 = or i1 %obit0, %obit1
%t2 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val2, i64 128)
%add2 = extractvalue {i64, i1} %t2, 0
%obit2 = extractvalue {i64, i1} %t2, 1
%res2 = or i1 %res1, %obit2
%t3 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val3, i64 128)
%add3 = extractvalue {i64, i1} %t3, 0
%obit3 = extractvalue {i64, i1} %t3, 1
%res3 = or i1 %res2, %obit3
%t4 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val4, i64 128)
%add4 = extractvalue {i64, i1} %t4, 0
%obit4 = extractvalue {i64, i1} %t4, 1
%res4 = or i1 %res3, %obit4
%t5 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val5, i64 128)
%add5 = extractvalue {i64, i1} %t5, 0
%obit5 = extractvalue {i64, i1} %t5, 1
%res5 = or i1 %res4, %obit5
%t6 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val6, i64 128)
%add6 = extractvalue {i64, i1} %t6, 0
%obit6 = extractvalue {i64, i1} %t6, 1
%res6 = or i1 %res5, %obit6
%t7 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val7, i64 128)
%add7 = extractvalue {i64, i1} %t7, 0
%obit7 = extractvalue {i64, i1} %t7, 1
%res7 = or i1 %res6, %obit7
%t8 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val8, i64 128)
%add8 = extractvalue {i64, i1} %t8, 0
%obit8 = extractvalue {i64, i1} %t8, 1
%res8 = or i1 %res7, %obit8
%t9 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val9, i64 128)
%add9 = extractvalue {i64, i1} %t9, 0
%obit9 = extractvalue {i64, i1} %t9, 1
%res9 = or i1 %res8, %obit9
%t10 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val10, i64 128)
%add10 = extractvalue {i64, i1} %t10, 0
%obit10 = extractvalue {i64, i1} %t10, 1
%res10 = or i1 %res9, %obit10
%t11 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val11, i64 128)
%add11 = extractvalue {i64, i1} %t11, 0
%obit11 = extractvalue {i64, i1} %t11, 1
%res11 = or i1 %res10, %obit11
%t12 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val12, i64 128)
%add12 = extractvalue {i64, i1} %t12, 0
%obit12 = extractvalue {i64, i1} %t12, 1
%res12 = or i1 %res11, %obit12
%t13 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val13, i64 128)
%add13 = extractvalue {i64, i1} %t13, 0
%obit13 = extractvalue {i64, i1} %t13, 1
%res13 = or i1 %res12, %obit13
%t14 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val14, i64 128)
%add14 = extractvalue {i64, i1} %t14, 0
%obit14 = extractvalue {i64, i1} %t14, 1
%res14 = or i1 %res13, %obit14
%t15 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val15, i64 128)
%add15 = extractvalue {i64, i1} %t15, 0
%obit15 = extractvalue {i64, i1} %t15, 1
%res15 = or i1 %res14, %obit15
br label %store
store:
%new0 = phi i64 [ %val0, %entry ], [ %add0, %add ]
%new1 = phi i64 [ %val1, %entry ], [ %add1, %add ]
%new2 = phi i64 [ %val2, %entry ], [ %add2, %add ]
%new3 = phi i64 [ %val3, %entry ], [ %add3, %add ]
%new4 = phi i64 [ %val4, %entry ], [ %add4, %add ]
%new5 = phi i64 [ %val5, %entry ], [ %add5, %add ]
%new6 = phi i64 [ %val6, %entry ], [ %add6, %add ]
%new7 = phi i64 [ %val7, %entry ], [ %add7, %add ]
%new8 = phi i64 [ %val8, %entry ], [ %add8, %add ]
%new9 = phi i64 [ %val9, %entry ], [ %add9, %add ]
%new10 = phi i64 [ %val10, %entry ], [ %add10, %add ]
%new11 = phi i64 [ %val11, %entry ], [ %add11, %add ]
%new12 = phi i64 [ %val12, %entry ], [ %add12, %add ]
%new13 = phi i64 [ %val13, %entry ], [ %add13, %add ]
%new14 = phi i64 [ %val14, %entry ], [ %add14, %add ]
%new15 = phi i64 [ %val15, %entry ], [ %add15, %add ]
%res = phi i1 [ 0, %entry ], [ %res15, %add ]
store volatile i64 %new0, i64 *%ptr
store volatile i64 %new1, i64 *%ptr
store volatile i64 %new2, i64 *%ptr
store volatile i64 %new3, i64 *%ptr
store volatile i64 %new4, i64 *%ptr
store volatile i64 %new5, i64 *%ptr
store volatile i64 %new6, i64 *%ptr
store volatile i64 %new7, i64 *%ptr
store volatile i64 %new8, i64 *%ptr
store volatile i64 %new9, i64 *%ptr
store volatile i64 %new10, i64 *%ptr
store volatile i64 %new11, i64 *%ptr
store volatile i64 %new12, i64 *%ptr
store volatile i64 %new13, i64 *%ptr
store volatile i64 %new14, i64 *%ptr
store volatile i64 %new15, i64 *%ptr
ret i1 %res
}
; Check that subtracting -127 from a spilled value can use AGSI.
define zeroext i1 @f12(i64 *%ptr, i64 %sel) {
; CHECK-LABEL: f12:
; CHECK: agsi {{[0-9]+}}(%r15), 127
; CHECK: br %r14
entry:
%val0 = load volatile i64, i64 *%ptr
%val1 = load volatile i64, i64 *%ptr
%val2 = load volatile i64, i64 *%ptr
%val3 = load volatile i64, i64 *%ptr
%val4 = load volatile i64, i64 *%ptr
%val5 = load volatile i64, i64 *%ptr
%val6 = load volatile i64, i64 *%ptr
%val7 = load volatile i64, i64 *%ptr
%val8 = load volatile i64, i64 *%ptr
%val9 = load volatile i64, i64 *%ptr
%val10 = load volatile i64, i64 *%ptr
%val11 = load volatile i64, i64 *%ptr
%val12 = load volatile i64, i64 *%ptr
%val13 = load volatile i64, i64 *%ptr
%val14 = load volatile i64, i64 *%ptr
%val15 = load volatile i64, i64 *%ptr
%test = icmp ne i64 %sel, 0
br i1 %test, label %add, label %store
add:
%t0 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val0, i64 -127)
%add0 = extractvalue {i64, i1} %t0, 0
%obit0 = extractvalue {i64, i1} %t0, 1
%t1 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val1, i64 -127)
%add1 = extractvalue {i64, i1} %t1, 0
%obit1 = extractvalue {i64, i1} %t1, 1
%res1 = or i1 %obit0, %obit1
%t2 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val2, i64 -127)
%add2 = extractvalue {i64, i1} %t2, 0
%obit2 = extractvalue {i64, i1} %t2, 1
%res2 = or i1 %res1, %obit2
%t3 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val3, i64 -127)
%add3 = extractvalue {i64, i1} %t3, 0
%obit3 = extractvalue {i64, i1} %t3, 1
%res3 = or i1 %res2, %obit3
%t4 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val4, i64 -127)
%add4 = extractvalue {i64, i1} %t4, 0
%obit4 = extractvalue {i64, i1} %t4, 1
%res4 = or i1 %res3, %obit4
%t5 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val5, i64 -127)
%add5 = extractvalue {i64, i1} %t5, 0
%obit5 = extractvalue {i64, i1} %t5, 1
%res5 = or i1 %res4, %obit5
%t6 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val6, i64 -127)
%add6 = extractvalue {i64, i1} %t6, 0
%obit6 = extractvalue {i64, i1} %t6, 1
%res6 = or i1 %res5, %obit6
%t7 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val7, i64 -127)
%add7 = extractvalue {i64, i1} %t7, 0
%obit7 = extractvalue {i64, i1} %t7, 1
%res7 = or i1 %res6, %obit7
%t8 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val8, i64 -127)
%add8 = extractvalue {i64, i1} %t8, 0
%obit8 = extractvalue {i64, i1} %t8, 1
%res8 = or i1 %res7, %obit8
%t9 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val9, i64 -127)
%add9 = extractvalue {i64, i1} %t9, 0
%obit9 = extractvalue {i64, i1} %t9, 1
%res9 = or i1 %res8, %obit9
%t10 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val10, i64 -127)
%add10 = extractvalue {i64, i1} %t10, 0
%obit10 = extractvalue {i64, i1} %t10, 1
%res10 = or i1 %res9, %obit10
%t11 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val11, i64 -127)
%add11 = extractvalue {i64, i1} %t11, 0
%obit11 = extractvalue {i64, i1} %t11, 1
%res11 = or i1 %res10, %obit11
%t12 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val12, i64 -127)
%add12 = extractvalue {i64, i1} %t12, 0
%obit12 = extractvalue {i64, i1} %t12, 1
%res12 = or i1 %res11, %obit12
%t13 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val13, i64 -127)
%add13 = extractvalue {i64, i1} %t13, 0
%obit13 = extractvalue {i64, i1} %t13, 1
%res13 = or i1 %res12, %obit13
%t14 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val14, i64 -127)
%add14 = extractvalue {i64, i1} %t14, 0
%obit14 = extractvalue {i64, i1} %t14, 1
%res14 = or i1 %res13, %obit14
%t15 = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %val15, i64 -127)
%add15 = extractvalue {i64, i1} %t15, 0
%obit15 = extractvalue {i64, i1} %t15, 1
%res15 = or i1 %res14, %obit15
br label %store
store:
%new0 = phi i64 [ %val0, %entry ], [ %add0, %add ]
%new1 = phi i64 [ %val1, %entry ], [ %add1, %add ]
%new2 = phi i64 [ %val2, %entry ], [ %add2, %add ]
%new3 = phi i64 [ %val3, %entry ], [ %add3, %add ]
%new4 = phi i64 [ %val4, %entry ], [ %add4, %add ]
%new5 = phi i64 [ %val5, %entry ], [ %add5, %add ]
%new6 = phi i64 [ %val6, %entry ], [ %add6, %add ]
%new7 = phi i64 [ %val7, %entry ], [ %add7, %add ]
%new8 = phi i64 [ %val8, %entry ], [ %add8, %add ]
%new9 = phi i64 [ %val9, %entry ], [ %add9, %add ]
%new10 = phi i64 [ %val10, %entry ], [ %add10, %add ]
%new11 = phi i64 [ %val11, %entry ], [ %add11, %add ]
%new12 = phi i64 [ %val12, %entry ], [ %add12, %add ]
%new13 = phi i64 [ %val13, %entry ], [ %add13, %add ]
%new14 = phi i64 [ %val14, %entry ], [ %add14, %add ]
%new15 = phi i64 [ %val15, %entry ], [ %add15, %add ]
%res = phi i1 [ 0, %entry ], [ %res15, %add ]
store volatile i64 %new0, i64 *%ptr
store volatile i64 %new1, i64 *%ptr
store volatile i64 %new2, i64 *%ptr
store volatile i64 %new3, i64 *%ptr
store volatile i64 %new4, i64 *%ptr
store volatile i64 %new5, i64 *%ptr
store volatile i64 %new6, i64 *%ptr
store volatile i64 %new7, i64 *%ptr
store volatile i64 %new8, i64 *%ptr
store volatile i64 %new9, i64 *%ptr
store volatile i64 %new10, i64 *%ptr
store volatile i64 %new11, i64 *%ptr
store volatile i64 %new12, i64 *%ptr
store volatile i64 %new13, i64 *%ptr
store volatile i64 %new14, i64 *%ptr
store volatile i64 %new15, i64 *%ptr
ret i1 %res
}
; Check using the overflow result for a branch.
define void @f13(i64 *%ptr) {
; CHECK-LABEL: f13:
; CHECK: agsi 0(%r2), -1
; CHECK: jgo foo@PLT
; CHECK: br %r14
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
br i1 %obit, label %call, label %exit
call:
tail call i64 @foo()
br label %exit
exit:
ret void
}
; ... and the same with the inverted direction.
define void @f14(i64 *%ptr) {
; CHECK-LABEL: f14:
; CHECK: agsi 0(%r2), -1
; CHECK: jgno foo@PLT
; CHECK: br %r14
%a = load i64, i64 *%ptr
%t = call {i64, i1} @llvm.ssub.with.overflow.i64(i64 %a, i64 1)
%val = extractvalue {i64, i1} %t, 0
%obit = extractvalue {i64, i1} %t, 1
store i64 %val, i64 *%ptr
br i1 %obit, label %exit, label %call
call:
tail call i64 @foo()
br label %exit
exit:
ret void
}
declare {i64, i1} @llvm.ssub.with.overflow.i64(i64, i64) nounwind readnone
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