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[InstCombine] add tests for smin+icmp; NFC
The tests that already work are folded in InstSimplify, so those tests should be redundant and we can remove them if they don't seem worthwhile for completeness. llvm-svn: 288957
This commit is contained in:
Sanjay Patel
parent
636fc9decc
commit
3a0c404a96
357
test/Transforms/InstCombine/smin-icmp.ll
Normal file
357
test/Transforms/InstCombine/smin-icmp.ll
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@ -0,0 +1,357 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -instcombine < %s | FileCheck %s
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; If we have an smin feeding a signed or equality icmp that shares an
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; operand with the smin, the compare should always be folded.
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; Test all 6 foldable predicates (eq,ne,sge,sgt,sle,slt) * 4 commutation
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; possibilities for each predicate. Note that folds to true/false or
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; folds to an existing instruction may be handled by InstSimplify.
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; smin(X, Y) == X --> X <= Y
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define i1 @eq_smin1(i32 %x, i32 %y) {
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; CHECK-LABEL: @eq_smin1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %x, %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %x, i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp eq i32 %sel, %x
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @eq_smin2(i32 %x, i32 %y) {
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; CHECK-LABEL: @eq_smin2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %y, %x
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %y, i32 %x
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; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp eq i32 %sel, %x
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ret i1 %cmp2
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}
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; Disguise the icmp predicate by commuting the min op to the RHS.
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define i1 @eq_smin3(i32 %a, i32 %y) {
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; CHECK-LABEL: @eq_smin3(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 [[X]], %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 [[X]], i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[X]], [[SEL]]
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp eq i32 %x, %sel
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @eq_smin4(i32 %a, i32 %y) {
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; CHECK-LABEL: @eq_smin4(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 [[X]], %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %y, i32 [[X]]
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; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[X]], [[SEL]]
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp eq i32 %x, %sel
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ret i1 %cmp2
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}
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; smin(X, Y) >= X --> X <= Y
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define i1 @sge_smin1(i32 %x, i32 %y) {
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; CHECK-LABEL: @sge_smin1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %x, %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %x, i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp sge i32 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp sge i32 %sel, %x
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @sge_smin2(i32 %x, i32 %y) {
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; CHECK-LABEL: @sge_smin2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %y, %x
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %y, i32 %x
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; CHECK-NEXT: [[CMP2:%.*]] = icmp sge i32 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp sge i32 %sel, %x
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ret i1 %cmp2
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}
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; Disguise the icmp predicate by commuting the min op to the RHS.
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define i1 @sge_smin3(i32 %a, i32 %y) {
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; CHECK-LABEL: @sge_smin3(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 [[X]], %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 [[X]], i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 [[X]], [[SEL]]
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp sle i32 %x, %sel
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @sge_smin4(i32 %a, i32 %y) {
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; CHECK-LABEL: @sge_smin4(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 [[X]], %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %y, i32 [[X]]
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; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 [[X]], [[SEL]]
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp sle i32 %x, %sel
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ret i1 %cmp2
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}
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; smin(X, Y) != X --> X > Y
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define i1 @ne_smin1(i32 %x, i32 %y) {
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; CHECK-LABEL: @ne_smin1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %x, %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %x, i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ne i32 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp ne i32 %sel, %x
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @ne_smin2(i32 %x, i32 %y) {
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; CHECK-LABEL: @ne_smin2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %y, %x
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; CHECK-NEXT: ret i1 [[CMP1]]
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;
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp ne i32 %sel, %x
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ret i1 %cmp2
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}
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; Disguise the icmp predicate by commuting the min op to the RHS.
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define i1 @ne_smin3(i32 %a, i32 %y) {
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; CHECK-LABEL: @ne_smin3(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 [[X]], %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 [[X]], i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ne i32 [[X]], [[SEL]]
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp ne i32 %x, %sel
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @ne_smin4(i32 %a, i32 %y) {
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; CHECK-LABEL: @ne_smin4(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 [[X]], %y
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; CHECK-NEXT: ret i1 [[CMP1]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp ne i32 %x, %sel
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ret i1 %cmp2
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}
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; smin(X, Y) < X --> X > Y
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define i1 @slt_smin1(i32 %x, i32 %y) {
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; CHECK-LABEL: @slt_smin1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %x, %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 %x, i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp slt i32 %sel, %x
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @slt_smin2(i32 %x, i32 %y) {
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; CHECK-LABEL: @slt_smin2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %y, %x
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; CHECK-NEXT: ret i1 [[CMP1]]
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;
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp slt i32 %sel, %x
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ret i1 %cmp2
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}
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; Disguise the icmp predicate by commuting the min op to the RHS.
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define i1 @slt_smin3(i32 %a, i32 %y) {
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; CHECK-LABEL: @slt_smin3(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 [[X]], %y
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[CMP1]], i32 [[X]], i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp sgt i32 [[X]], [[SEL]]
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp sgt i32 %x, %sel
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @slt_smin4(i32 %a, i32 %y) {
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; CHECK-LABEL: @slt_smin4(
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; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 [[X]], %y
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; CHECK-NEXT: ret i1 [[CMP1]]
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp sgt i32 %x, %sel
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ret i1 %cmp2
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}
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; smin(X, Y) <= X --> true
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define i1 @sle_smin1(i32 %x, i32 %y) {
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; CHECK-LABEL: @sle_smin1(
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; CHECK-NEXT: ret i1 true
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;
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp sle i32 %sel, %x
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @sle_smin2(i32 %x, i32 %y) {
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; CHECK-LABEL: @sle_smin2(
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; CHECK-NEXT: ret i1 true
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;
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp sle i32 %sel, %x
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ret i1 %cmp2
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}
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; Disguise the icmp predicate by commuting the min op to the RHS.
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define i1 @sle_smin3(i32 %a, i32 %y) {
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; CHECK-LABEL: @sle_smin3(
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; CHECK-NEXT: ret i1 true
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp sge i32 %x, %sel
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @sle_smin4(i32 %a, i32 %y) {
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; CHECK-LABEL: @sle_smin4(
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; CHECK-NEXT: ret i1 true
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp sge i32 %x, %sel
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ret i1 %cmp2
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}
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; smin(X, Y) > X --> false
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define i1 @sgt_smin1(i32 %x, i32 %y) {
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; CHECK-LABEL: @sgt_smin1(
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; CHECK-NEXT: ret i1 false
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;
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp sgt i32 %sel, %x
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @sgt_smin2(i32 %x, i32 %y) {
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; CHECK-LABEL: @sgt_smin2(
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; CHECK-NEXT: ret i1 false
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;
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp sgt i32 %sel, %x
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ret i1 %cmp2
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}
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; Disguise the icmp predicate by commuting the min op to the RHS.
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define i1 @sgt_smin3(i32 %a, i32 %y) {
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; CHECK-LABEL: @sgt_smin3(
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; CHECK-NEXT: ret i1 false
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %x, %y
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%sel = select i1 %cmp1, i32 %x, i32 %y
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%cmp2 = icmp slt i32 %x, %sel
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ret i1 %cmp2
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}
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; Commute min operands.
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define i1 @sgt_smin4(i32 %a, i32 %y) {
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; CHECK-LABEL: @sgt_smin4(
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; CHECK-NEXT: ret i1 false
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;
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%x = add i32 %a, 3 ; thwart complexity-based canonicalization
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%cmp1 = icmp slt i32 %y, %x
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%sel = select i1 %cmp1, i32 %y, i32 %x
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%cmp2 = icmp slt i32 %x, %sel
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ret i1 %cmp2
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}
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