smin-icmp.ll
8.38 KB
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -instcombine < %s | FileCheck %s
; If we have an smin feeding a signed or equality icmp that shares an
; operand with the smin, the compare should always be folded.
; Test all 6 foldable predicates (eq,ne,sge,sgt,sle,slt) * 4 commutation
; possibilities for each predicate. Note that folds to true/false or
; folds to an existing instruction may be handled by InstSimplify.
; smin(X, Y) == X --> X <= Y
define i1 @eq_smin1(i32 %x, i32 %y) {
; CHECK-LABEL: @eq_smin1(
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 %x, %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp eq i32 %sel, %x
ret i1 %cmp2
}
; Commute min operands.
define i1 @eq_smin2(i32 %x, i32 %y) {
; CHECK-LABEL: @eq_smin2(
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 %x, %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp eq i32 %sel, %x
ret i1 %cmp2
}
; Disguise the icmp predicate by commuting the min op to the RHS.
define i1 @eq_smin3(i32 %a, i32 %y) {
; CHECK-LABEL: @eq_smin3(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp eq i32 %x, %sel
ret i1 %cmp2
}
; Commute min operands.
define i1 @eq_smin4(i32 %a, i32 %y) {
; CHECK-LABEL: @eq_smin4(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp eq i32 %x, %sel
ret i1 %cmp2
}
; smin(X, Y) >= X --> X <= Y
define i1 @sge_smin1(i32 %x, i32 %y) {
; CHECK-LABEL: @sge_smin1(
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 %x, %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp sge i32 %sel, %x
ret i1 %cmp2
}
; Commute min operands.
define i1 @sge_smin2(i32 %x, i32 %y) {
; CHECK-LABEL: @sge_smin2(
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 %x, %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp sge i32 %sel, %x
ret i1 %cmp2
}
; Disguise the icmp predicate by commuting the min op to the RHS.
define i1 @sge_smin3(i32 %a, i32 %y) {
; CHECK-LABEL: @sge_smin3(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp sle i32 %x, %sel
ret i1 %cmp2
}
; Commute min operands.
define i1 @sge_smin4(i32 %a, i32 %y) {
; CHECK-LABEL: @sge_smin4(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP2:%.*]] = icmp sle i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp sle i32 %x, %sel
ret i1 %cmp2
}
; smin(X, Y) != X --> X > Y
define i1 @ne_smin1(i32 %x, i32 %y) {
; CHECK-LABEL: @ne_smin1(
; CHECK-NEXT: [[CMP2:%.*]] = icmp sgt i32 %x, %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp ne i32 %sel, %x
ret i1 %cmp2
}
; Commute min operands.
define i1 @ne_smin2(i32 %x, i32 %y) {
; CHECK-LABEL: @ne_smin2(
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %y, %x
; CHECK-NEXT: ret i1 [[CMP1]]
;
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp ne i32 %sel, %x
ret i1 %cmp2
}
; Disguise the icmp predicate by commuting the min op to the RHS.
define i1 @ne_smin3(i32 %a, i32 %y) {
; CHECK-LABEL: @ne_smin3(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP2:%.*]] = icmp sgt i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp ne i32 %x, %sel
ret i1 %cmp2
}
; Commute min operands.
define i1 @ne_smin4(i32 %a, i32 %y) {
; CHECK-LABEL: @ne_smin4(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP1]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp ne i32 %x, %sel
ret i1 %cmp2
}
; smin(X, Y) < X --> X > Y
define i1 @slt_smin1(i32 %x, i32 %y) {
; CHECK-LABEL: @slt_smin1(
; CHECK-NEXT: [[CMP2:%.*]] = icmp sgt i32 %x, %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp slt i32 %sel, %x
ret i1 %cmp2
}
; Commute min operands.
define i1 @slt_smin2(i32 %x, i32 %y) {
; CHECK-LABEL: @slt_smin2(
; CHECK-NEXT: [[CMP1:%.*]] = icmp slt i32 %y, %x
; CHECK-NEXT: ret i1 [[CMP1]]
;
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp slt i32 %sel, %x
ret i1 %cmp2
}
; Disguise the icmp predicate by commuting the min op to the RHS.
define i1 @slt_smin3(i32 %a, i32 %y) {
; CHECK-LABEL: @slt_smin3(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP2:%.*]] = icmp sgt i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP2]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp sgt i32 %x, %sel
ret i1 %cmp2
}
; Commute min operands.
define i1 @slt_smin4(i32 %a, i32 %y) {
; CHECK-LABEL: @slt_smin4(
; CHECK-NEXT: [[X:%.*]] = add i32 %a, 3
; CHECK-NEXT: [[CMP1:%.*]] = icmp sgt i32 [[X]], %y
; CHECK-NEXT: ret i1 [[CMP1]]
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp sgt i32 %x, %sel
ret i1 %cmp2
}
; smin(X, Y) <= X --> true
define i1 @sle_smin1(i32 %x, i32 %y) {
; CHECK-LABEL: @sle_smin1(
; CHECK-NEXT: ret i1 true
;
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp sle i32 %sel, %x
ret i1 %cmp2
}
; Commute min operands.
define i1 @sle_smin2(i32 %x, i32 %y) {
; CHECK-LABEL: @sle_smin2(
; CHECK-NEXT: ret i1 true
;
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp sle i32 %sel, %x
ret i1 %cmp2
}
; Disguise the icmp predicate by commuting the min op to the RHS.
define i1 @sle_smin3(i32 %a, i32 %y) {
; CHECK-LABEL: @sle_smin3(
; CHECK-NEXT: ret i1 true
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp sge i32 %x, %sel
ret i1 %cmp2
}
; Commute min operands.
define i1 @sle_smin4(i32 %a, i32 %y) {
; CHECK-LABEL: @sle_smin4(
; CHECK-NEXT: ret i1 true
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp sge i32 %x, %sel
ret i1 %cmp2
}
; smin(X, Y) > X --> false
define i1 @sgt_smin1(i32 %x, i32 %y) {
; CHECK-LABEL: @sgt_smin1(
; CHECK-NEXT: ret i1 false
;
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp sgt i32 %sel, %x
ret i1 %cmp2
}
; Commute min operands.
define i1 @sgt_smin2(i32 %x, i32 %y) {
; CHECK-LABEL: @sgt_smin2(
; CHECK-NEXT: ret i1 false
;
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp sgt i32 %sel, %x
ret i1 %cmp2
}
; Disguise the icmp predicate by commuting the min op to the RHS.
define i1 @sgt_smin3(i32 %a, i32 %y) {
; CHECK-LABEL: @sgt_smin3(
; CHECK-NEXT: ret i1 false
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %x, %y
%sel = select i1 %cmp1, i32 %x, i32 %y
%cmp2 = icmp slt i32 %x, %sel
ret i1 %cmp2
}
; Commute min operands.
define i1 @sgt_smin4(i32 %a, i32 %y) {
; CHECK-LABEL: @sgt_smin4(
; CHECK-NEXT: ret i1 false
;
%x = add i32 %a, 3 ; thwart complexity-based canonicalization
%cmp1 = icmp slt i32 %y, %x
%sel = select i1 %cmp1, i32 %y, i32 %x
%cmp2 = icmp slt i32 %x, %sel
ret i1 %cmp2
}