forked from OSchip/llvm-project
[InstCombine] add tests for smax+icmp; NFC
llvm-svn: 289151
This commit is contained in:
Sanjay Patel
parent
b58346f2f2
commit
b641aa3f14
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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 smax feeding a signed or equality icmp that shares an
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; operand with the smax, the compare should always be folded.
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; Test all 4 foldable predicates (eq,ne,sgt,sle) * 4 commutation
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; possibilities for each predicate. Note that folds to true/false
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; (predicate = sge/slt) or folds to an existing instruction should be
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; handled by InstSimplify.
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; smax(X, Y) == X --> X >= Y
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define i1 @eq_smax1(i32 %x, i32 %y) {
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; CHECK-LABEL: @eq_smax1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt 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 sgt 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 max operands.
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define i1 @eq_smax2(i32 %x, i32 %y) {
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; CHECK-LABEL: @eq_smax2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt 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 sgt 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 max op to the RHS.
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define i1 @eq_smax3(i32 %a, i32 %y) {
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; CHECK-LABEL: @eq_smax3(
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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 [[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 sgt 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 max operands.
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define i1 @eq_smax4(i32 %a, i32 %y) {
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; CHECK-LABEL: @eq_smax4(
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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 %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 sgt 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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; smax(X, Y) <= X --> X >= Y
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define i1 @sle_smax1(i32 %x, i32 %y) {
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; CHECK-LABEL: @sle_smax1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt 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 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp sgt 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 max operands.
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define i1 @sle_smax2(i32 %x, i32 %y) {
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; CHECK-LABEL: @sle_smax2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt 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 sle i32 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp sgt 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 max op to the RHS.
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define i1 @sle_smax3(i32 %a, i32 %y) {
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; CHECK-LABEL: @sle_smax3(
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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 [[X]], i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp sge 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 sgt 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 max operands.
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define i1 @sle_smax4(i32 %a, i32 %y) {
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; CHECK-LABEL: @sle_smax4(
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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 %y, i32 [[X]]
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; CHECK-NEXT: [[CMP2:%.*]] = icmp sge 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 sgt 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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; smax(X, Y) != X --> X < Y
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define i1 @ne_smax1(i32 %x, i32 %y) {
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; CHECK-LABEL: @ne_smax1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt 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 sgt 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 max operands.
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define i1 @ne_smax2(i32 %x, i32 %y) {
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; CHECK-LABEL: @ne_smax2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 %y, %x
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; CHECK-NEXT: ret i1 [[CMP1]]
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;
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%cmp1 = icmp sgt 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 max op to the RHS.
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define i1 @ne_smax3(i32 %a, i32 %y) {
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; CHECK-LABEL: @ne_smax3(
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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 [[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 sgt 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 max operands.
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define i1 @ne_smax4(i32 %a, i32 %y) {
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; CHECK-LABEL: @ne_smax4(
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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: 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 sgt 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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; smax(X, Y) > X --> X < Y
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define i1 @sgt_smax1(i32 %x, i32 %y) {
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; CHECK-LABEL: @sgt_smax1(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt 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 [[SEL]], %x
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; CHECK-NEXT: ret i1 [[CMP2]]
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;
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%cmp1 = icmp sgt 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 max operands.
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define i1 @sgt_smax2(i32 %x, i32 %y) {
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; CHECK-LABEL: @sgt_smax2(
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; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 %y, %x
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; CHECK-NEXT: ret i1 [[CMP1]]
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;
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%cmp1 = icmp sgt 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 max op to the RHS.
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define i1 @sgt_smax3(i32 %a, i32 %y) {
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; CHECK-LABEL: @sgt_smax3(
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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 [[X]], i32 %y
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; CHECK-NEXT: [[CMP2:%.*]] = icmp slt 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 sgt 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 max operands.
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define i1 @sgt_smax4(i32 %a, i32 %y) {
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; CHECK-LABEL: @sgt_smax4(
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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: 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 sgt 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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