derek.holloway
7502bf64a4
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104 lines
2.4 KiB
LLVM
104 lines
2.4 KiB
LLVM
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z14 -disable-cgp | FileCheck %s
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;
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; Check that signed comparisons against 0 are eliminated if the defining
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; instruction is an add with immediate.
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;
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; Addition of an immediate does not depend on the "nsw" flag, since the
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; result can be predicted in case of overflow. For example, if adding a
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; positive immediate gives overflow, the result must be negative.
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; Addition of a negative immediate gives a positive result in case of
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; overflow (except for the case of the minimum value which may also result in
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; a zero result).
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define i32 @fun0(i32 %arg) {
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; CHECK-LABEL: fun0:
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; CHECK: ahik
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; CHECK-NEXT: locre
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bb:
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%tmp = add i32 %arg, -1
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%tmp1 = icmp eq i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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define i32 @fun1(i32 %arg) {
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; CHECK-LABEL: fun1:
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; CHECK: ahik
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; CHECK-NEXT: locrnle
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bb:
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%tmp = add i32 %arg, -1
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%tmp1 = icmp sgt i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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define i32 @fun2(i32 %arg) {
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; CHECK-LABEL: fun2:
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; CHECK: ahik
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; CHECK-NEXT: locrl
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bb:
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%tmp = add i32 %arg, -1
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%tmp1 = icmp slt i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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; Addition of a positive immediate gives a negative result in case of overflow.
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define i32 @fun3(i32 %arg) {
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; CHECK-LABEL: fun3:
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; CHECK: ahik
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; CHECK-NEXT: locre
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bb:
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%tmp = add i32 %arg, 1
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%tmp1 = icmp eq i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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define i32 @fun4(i32 %arg) {
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; CHECK-LABEL: fun4:
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; CHECK: ahik
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; CHECK-NEXT: locrh
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bb:
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%tmp = add i32 %arg, 1
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%tmp1 = icmp sgt i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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define i32 @fun5(i32 %arg) {
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; CHECK-LABEL: fun5:
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; CHECK: ahik
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; CHECK-NEXT: locrnhe
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bb:
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%tmp = add i32 %arg, 1
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%tmp1 = icmp slt i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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; Addition of the minimum value gives a positive or zero result.
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define i32 @fun6(i32 %arg) {
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; CHECK-LABEL: fun6:
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; CHECK: afi
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; CHECK-NEXT: chi
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; CHECK-NEXT: locre
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bb:
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%tmp = add i32 %arg, -2147483648
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%tmp1 = icmp eq i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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define i32 @fun7(i32 %arg) {
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; CHECK-LABEL: fun7:
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; CHECK: afi
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; CHECK-NEXT: chi
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; CHECK-NEXT: locrh
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bb:
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%tmp = add i32 %arg, -2147483648
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%tmp1 = icmp sgt i32 %tmp, 0
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%res = select i1 %tmp1, i32 %tmp, i32 %arg
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ret i32 %res
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}
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