canonicalize-clamp-with-select-of-constant-threshold-pattern.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s

; These patterns are all just traditional clamp pattern.
; But they are not canonical, the and/or/xor is more canonically represented
; as an add+icmp.

define i32 @t0_select_cond_and_v0(i32 %X) {
; CHECK-LABEL: @t0_select_cond_and_v0(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %dont_need_to_clamp_positive = icmp sle i32 %X, 32767
  %dont_need_to_clamp_negative = icmp sge i32 %X, -32768
  %clamp_limit = select i1 %dont_need_to_clamp_positive, i32 -32768, i32 32767
  %dont_need_to_clamp = and i1 %dont_need_to_clamp_positive, %dont_need_to_clamp_negative
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}

define i32 @t0_select_cond_and_v0_logical(i32 %X) {
; CHECK-LABEL: @t0_select_cond_and_v0_logical(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %dont_need_to_clamp_positive = icmp sle i32 %X, 32767
  %dont_need_to_clamp_negative = icmp sge i32 %X, -32768
  %clamp_limit = select i1 %dont_need_to_clamp_positive, i32 -32768, i32 32767
  %dont_need_to_clamp = select i1 %dont_need_to_clamp_positive, i1 %dont_need_to_clamp_negative, i1 false
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}
define i32 @t1_select_cond_and_v1(i32 %X) {
; CHECK-LABEL: @t1_select_cond_and_v1(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %dont_need_to_clamp_positive = icmp sle i32 %X, 32767
  %dont_need_to_clamp_negative = icmp sge i32 %X, -32768
  %clamp_limit = select i1 %dont_need_to_clamp_negative, i32 32767, i32 -32768
  %dont_need_to_clamp = and i1 %dont_need_to_clamp_positive, %dont_need_to_clamp_negative
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}

define i32 @t1_select_cond_and_v1_logical(i32 %X) {
; CHECK-LABEL: @t1_select_cond_and_v1_logical(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %dont_need_to_clamp_positive = icmp sle i32 %X, 32767
  %dont_need_to_clamp_negative = icmp sge i32 %X, -32768
  %clamp_limit = select i1 %dont_need_to_clamp_negative, i32 32767, i32 -32768
  %dont_need_to_clamp = select i1 %dont_need_to_clamp_positive, i1 %dont_need_to_clamp_negative, i1 false
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}

;-------------------------------------------------------------------------------

define i32 @t2_select_cond_or_v0(i32 %X) {
; CHECK-LABEL: @t2_select_cond_or_v0(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %need_to_clamp_positive = icmp sgt i32 %X, 32767
  %need_to_clamp_negative = icmp slt i32 %X, -32768
  %clamp_limit = select i1 %need_to_clamp_positive, i32 32767, i32 -32768
  %need_to_clamp = or i1 %need_to_clamp_positive, %need_to_clamp_negative
  %R = select i1 %need_to_clamp, i32 %clamp_limit, i32 %X
  ret i32 %R
}

define i32 @t2_select_cond_or_v0_logical(i32 %X) {
; CHECK-LABEL: @t2_select_cond_or_v0_logical(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %need_to_clamp_positive = icmp sgt i32 %X, 32767
  %need_to_clamp_negative = icmp slt i32 %X, -32768
  %clamp_limit = select i1 %need_to_clamp_positive, i32 32767, i32 -32768
  %need_to_clamp = select i1 %need_to_clamp_positive, i1 true, i1 %need_to_clamp_negative
  %R = select i1 %need_to_clamp, i32 %clamp_limit, i32 %X
  ret i32 %R
}
define i32 @t3_select_cond_or_v1(i32 %X) {
; CHECK-LABEL: @t3_select_cond_or_v1(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %need_to_clamp_positive = icmp sgt i32 %X, 32767
  %need_to_clamp_negative = icmp slt i32 %X, -32768
  %clamp_limit = select i1 %need_to_clamp_negative, i32 -32768, i32 32767
  %need_to_clamp = or i1 %need_to_clamp_positive, %need_to_clamp_negative
  %R = select i1 %need_to_clamp, i32 %clamp_limit, i32 %X
  ret i32 %R
}

define i32 @t3_select_cond_or_v1_logical(i32 %X) {
; CHECK-LABEL: @t3_select_cond_or_v1_logical(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %need_to_clamp_positive = icmp sgt i32 %X, 32767
  %need_to_clamp_negative = icmp slt i32 %X, -32768
  %clamp_limit = select i1 %need_to_clamp_negative, i32 -32768, i32 32767
  %need_to_clamp = select i1 %need_to_clamp_positive, i1 true, i1 %need_to_clamp_negative
  %R = select i1 %need_to_clamp, i32 %clamp_limit, i32 %X
  ret i32 %R
}

;-------------------------------------------------------------------------------

define i32 @t4_select_cond_xor_v0(i32 %X) {
; CHECK-LABEL: @t4_select_cond_xor_v0(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %need_to_clamp_positive = icmp sgt i32 %X, 32767
  %dont_need_to_clamp_negative = icmp sgt i32 %X, -32768
  %clamp_limit = select i1 %need_to_clamp_positive, i32 32767, i32 -32768
  %dont_need_to_clamp = xor i1 %need_to_clamp_positive, %dont_need_to_clamp_negative
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}
define i32 @t4_select_cond_xor_v1(i32 %X) {
; CHECK-LABEL: @t4_select_cond_xor_v1(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %need_to_clamp_positive = icmp sgt i32 %X, 32767
  %dont_need_to_clamp_negative = icmp sgt i32 %X, -32768
  %clamp_limit = select i1 %dont_need_to_clamp_negative, i32 32767, i32 -32768
  %dont_need_to_clamp = xor i1 %need_to_clamp_positive, %dont_need_to_clamp_negative
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}

define i32 @t5_select_cond_xor_v2(i32 %X) {
; CHECK-LABEL: @t5_select_cond_xor_v2(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %dont_need_to_clamp_positive = icmp sle i32 %X, 32767
  %need_to_clamp_negative = icmp sle i32 %X, -32768
  %clamp_limit = select i1 %need_to_clamp_negative, i32 -32768, i32 32767
  %dont_need_to_clamp = xor i1 %dont_need_to_clamp_positive, %need_to_clamp_negative
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}
define i32 @t5_select_cond_xor_v3(i32 %X) {
; CHECK-LABEL: @t5_select_cond_xor_v3(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 -32768)
; CHECK-NEXT:    [[R:%.*]] = call i32 @llvm.smin.i32(i32 [[TMP1]], i32 32767)
; CHECK-NEXT:    ret i32 [[R]]
;
  %dont_need_to_clamp_positive = icmp sle i32 %X, 32767
  %need_to_clamp_negative = icmp sle i32 %X, -32768
  %clamp_limit = select i1 %dont_need_to_clamp_positive, i32 -32768, i32 32767
  %dont_need_to_clamp = xor i1 %dont_need_to_clamp_positive, %need_to_clamp_negative
  %R = select i1 %dont_need_to_clamp, i32 %X, i32 %clamp_limit
  ret i32 %R
}
llvm/llvm/test/Transforms/InstCombine/canonicalize-clamp-with-select-of-constant-threshold-pattern.ll
