6599961c17
This patch contains following enhancements to SrcRegMap and DstRegMap:
1 In findOnlyInterestingUse not only check if the Reg is two address usage,
but also check after commutation can it be two address usage.
2 If a physical register is clobbered, remove SrcRegMap entries that are
mapped to it.
3 In processTiedPairs, when create a new COPY instruction, add a SrcRegMap
entry only when the COPY instruction is coalescable. (The COPY src is
killed)
With these enhancements isProfitableToCommute can do better commute decision,
and finally more register copies are removed.
Differential Revision: https://reviews.llvm.org/D108731
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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