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llvm-mirror/test/CodeGen/SystemZ/int-ssub-06.ll
Ulrich Weigand 0c16dcd701 [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 17:54:28 +00:00

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; Test 32-bit subtraction in which the second operand is constant.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
declare i32 @foo()
; Check subtractions of 1.
define zeroext i1 @f1(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f1:
; CHECK: ahi %r3, -1
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 1)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the high end of the AHI range.
define zeroext i1 @f2(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f2:
; CHECK: ahi %r3, -32768
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 32768)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the next value up, which must use AFI instead.
define zeroext i1 @f3(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f3:
; CHECK: afi %r3, -32769
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 32769)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the high end of the signed 32-bit range.
define zeroext i1 @f4(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f4:
; CHECK: afi %r3, -2147483647
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 2147483647)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the next value up, which is treated as a negative value
; and must use a register.
define zeroext i1 @f5(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f5:
; CHECK: llilh [[REG1:%r[0-5]]], 32768
; CHECK: sr %r3, [[REG1]]
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 2147483648)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the next value up, which is treated as a negative value,
; and can use AFI again.
define zeroext i1 @f6(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f6:
; CHECK: afi %r3, 2147483647
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 2147483649)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the high end of the negative AHI range.
define zeroext i1 @f7(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f7:
; CHECK: ahi %r3, 1
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 -1)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the low end of the AHI range.
define zeroext i1 @f8(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f8:
; CHECK: ahi %r3, 32767
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 -32767)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the next value down, which must use AFI instead.
define zeroext i1 @f9(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f9:
; CHECK: afi %r3, 32768
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 -32768)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the low end of the signed 32-bit range.
define zeroext i1 @f10(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f10:
; CHECK: afi %r3, 2147483647
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 -2147483647)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the next value down, which must use a register.
define zeroext i1 @f11(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f11:
; CHECK: llilh [[REG1:%r[0-5]]], 32768
; CHECK: sr %r3, [[REG1]]
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 -2147483648)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check the next value down, which is treated as a positive value.
define zeroext i1 @f12(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f12:
; CHECK: afi %r3, -2147483647
; CHECK-DAG: st %r3, 0(%r4)
; CHECK-DAG: ipm [[REG:%r[0-5]]]
; CHECK-DAG: afi [[REG]], 1342177280
; CHECK-DAG: risbg %r2, [[REG]], 63, 191, 33
; CHECK: br %r14
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 -2147483649)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
ret i1 %obit
}
; Check using the overflow result for a branch.
define void @f13(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f13:
; CHECK: ahi %r3, -1
; CHECK: st %r3, 0(%r4)
; CHECK: {{jgo foo@PLT|bnor %r14}}
; CHECK: {{br %r14|jg foo@PLT}}
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 1)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
br i1 %obit, label %call, label %exit
call:
tail call i32 @foo()
br label %exit
exit:
ret void
}
; ... and the same with the inverted direction.
define void @f14(i32 %dummy, i32 %a, i32 *%res) {
; CHECK-LABEL: f14:
; CHECK: ahi %r3, -1
; CHECK: st %r3, 0(%r4)
; CHECK: {{jgno foo@PLT|bor %r14}}
; CHECK: {{br %r14|jg foo@PLT}}
%t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %a, i32 1)
%val = extractvalue {i32, i1} %t, 0
%obit = extractvalue {i32, i1} %t, 1
store i32 %val, i32 *%res
br i1 %obit, label %exit, label %call
call:
tail call i32 @foo()
br label %exit
exit:
ret void
}
declare {i32, i1} @llvm.ssub.with.overflow.i32(i32, i32) nounwind readnone
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