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Added inst-combine for 'MIN(MIN(A, 97), 23)' and 'MAX(MAX(A, 23), 97)'

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This removes TODO added in r208849 [http://reviews.llvm.org/D3629]

MIN(MIN(A, 97), 23) -> MIN(A, 23)
MAX(MAX(A, 23), 97) -> MAX(A, 97)

Differential Revision: http://reviews.llvm.org/D3785



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209110 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dinesh Dwivedi 2014-05-19 07:08:32 +00:00
parent cb596baadd
commit 306cd28e21
2 changed files with 65 additions and 5 deletions
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18
lib/Transforms/InstCombine/InstCombineSelect.cpp
View File

@ -651,24 +651,32 @@ Instruction *InstCombiner::FoldSPFofSPF(Instruction *Inner,
return ReplaceInstUsesWith(Outer, C);
}
// MIN(MIN(A, 23), 97) -> MIN(A, 23)
// MAX(MAX(A, 97), 23) -> MAX(A, 97)
if (SPF1 == SPF2) {
if (ConstantInt *CB = dyn_cast<ConstantInt>(B)) {
if (ConstantInt *CC = dyn_cast<ConstantInt>(C)) {
APInt ACB = CB->getValue();
APInt ACC = CC->getValue();
// MIN(MIN(A, 23), 97) -> MIN(A, 23)
// MAX(MAX(A, 97), 23) -> MAX(A, 97)
if ((SPF1 == SPF_UMIN && ACB.ule(ACC)) ||
(SPF1 == SPF_SMIN && ACB.sle(ACC)) ||
(SPF1 == SPF_UMAX && ACB.uge(ACC)) ||
(SPF1 == SPF_SMAX && ACB.sge(ACC)))
return ReplaceInstUsesWith(Outer, Inner);
// MIN(MIN(A, 97), 23) -> MIN(A, 23)
// MAX(MAX(A, 23), 97) -> MAX(A, 97)
if ((SPF1 == SPF_UMIN && ACB.ugt(ACC)) ||
(SPF1 == SPF_SMIN && ACB.sgt(ACC)) ||
(SPF1 == SPF_UMAX && ACB.ult(ACC)) ||
(SPF1 == SPF_SMAX && ACB.slt(ACC))) {
Outer.replaceUsesOfWith(Inner, A);
return &Outer;
}
}
}
}
// TODO: MIN(MIN(A, 97), 23) -> MIN(A, 23)
// TODO: MAX(MAX(A, 23), 97) -> MAX(A, 97)
return nullptr;
}

52
test/Transforms/InstCombine/select.ll
View File

@ -1078,4 +1078,56 @@ entry:
ret i32 %retval
; CHECK-LABEL: @test71(
; CHECK: ret i32 %cond
}
; SMIN(SMIN(X, 92), 11) -> SMIN(X, 11)
define i32 @test72(i32 %x) {
%cmp = icmp sgt i32 %x, 92
%cond = select i1 %cmp, i32 92, i32 %x
%cmp3 = icmp sgt i32 %cond, 11
%retval = select i1 %cmp3, i32 11, i32 %cond
ret i32 %retval
; CHECK-LABEL: @test72(
; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp sgt i32 %x, 11
; CHECK-NEXT: [[SEL:%[a-z0-9]+]] = select i1 [[CMP]], i32 11, i32 %x
; CHECK-NEXT: ret i32 [[SEL]]
}
; MIN(MIN(X, 83), 24) -> MIN(X, 24)
define i32 @test73(i32 %x) {
%cmp = icmp ugt i32 %x, 83
%cond = select i1 %cmp, i32 83, i32 %x
%cmp3 = icmp ugt i32 %cond, 24
%retval = select i1 %cmp3, i32 24, i32 %cond
ret i32 %retval
; CHECK-LABEL: @test73(
; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ugt i32 %x, 24
; CHECK-NEXT: [[SEL:%[a-z0-9]+]] = select i1 [[CMP]], i32 24, i32 %x
; CHECK-NEXT: ret i32 [[SEL]]
}
; SMAX(SMAX(X, 36), 75) -> SMAX(X, 75)
define i32 @test74(i32 %x) {
%cmp = icmp slt i32 %x, 36
%cond = select i1 %cmp, i32 36, i32 %x
%cmp3 = icmp slt i32 %cond, 75
%retval = select i1 %cmp3, i32 75, i32 %cond
ret i32 %retval
; CHECK-LABEL: @test74(
; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp slt i32 %x, 75
; CHECK-NEXT: [[SEL:%[a-z0-9]+]] = select i1 [[CMP]], i32 75, i32 %x
; CHECK-NEXT: ret i32 [[SEL]]
}
; MAX(MAX(X, 47), 68) -> MAX(X, 68)
define i32 @test75(i32 %x) {
%cmp = icmp ult i32 %x, 47
%cond = select i1 %cmp, i32 47, i32 %x
%cmp3 = icmp ult i32 %cond, 68
%retval = select i1 %cmp3, i32 68, i32 %cond
ret i32 %retval
; CHECK-LABEL: @test75(
; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ult i32 %x, 68
; CHECK-NEXT: [[SEL:%[a-z0-9]+]] = select i1 [[CMP]], i32 68, i32 %x
; CHECK-NEXT: ret i32 [[SEL]]
}