llvm/test/Transforms/InstCombine/select-min-max.ll

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

declare i5 @llvm.smin.i5(i5, i5)
declare <2 x i8> @llvm.smax.v2i8(<2 x i8>, <2 x i8>)
declare i5 @llvm.umin.i5(i5, i5)
declare <3 x i5> @llvm.umax.v3i5(<3 x i5>, <3 x i5>)

define i5 @smin_smin_common_op_00(i1 %cond, i5 %x, i5 %y, i5 %z) {
; CHECK-LABEL: @smin_smin_common_op_00(
; CHECK-NEXT:    [[MINMAXOP:%.*]] = select i1 [[COND:%.*]], i5 [[X:%.*]], i5 [[Y:%.*]]
; CHECK-NEXT:    [[SEL:%.*]] = call i5 @llvm.smin.i5(i5 [[MINMAXOP]], i5 [[Z:%.*]])
; CHECK-NEXT:    ret i5 [[SEL]]
;
  %m1 = call i5 @llvm.smin.i5(i5 %z, i5 %x)
  %m2 = call i5 @llvm.smin.i5(i5 %z, i5 %y)
  %sel = select i1 %cond, i5 %m1, i5 %m2
  ret i5 %sel
}

define <2 x i8> @smax_smax_common_op_01(<2 x i1> %cond, <2 x i8> %x, <2 x i8> %y, <2 x i8> %z) {
; CHECK-LABEL: @smax_smax_common_op_01(
; CHECK-NEXT:    [[MINMAXOP:%.*]] = select <2 x i1> [[COND:%.*]], <2 x i8> [[X:%.*]], <2 x i8> [[Y:%.*]]
; CHECK-NEXT:    [[SEL:%.*]] = call <2 x i8> @llvm.smax.v2i8(<2 x i8> [[MINMAXOP]], <2 x i8> [[Z:%.*]])
; CHECK-NEXT:    ret <2 x i8> [[SEL]]
;
  %m1 = call <2 x i8> @llvm.smax.v2i8(<2 x i8> %z, <2 x i8> %x)
  %m2 = call <2 x i8> @llvm.smax.v2i8(<2 x i8> %y, <2 x i8> %z)
  %sel = select <2 x i1> %cond, <2 x i8> %m1, <2 x i8> %m2
  ret <2 x i8> %sel
}

define i5 @umin_umin_common_op_10(i1 %cond, i5 %x, i5 %y, i5 %z, i5* %p) {
; CHECK-LABEL: @umin_umin_common_op_10(
; CHECK-NEXT:    [[M1:%.*]] = call i5 @llvm.umin.i5(i5 [[X:%.*]], i5 [[Z:%.*]])
; CHECK-NEXT:    store i5 [[M1]], i5* [[P:%.*]], align 1
; CHECK-NEXT:    [[MINMAXOP:%.*]] = select i1 [[COND:%.*]], i5 [[X]], i5 [[Y:%.*]]
; CHECK-NEXT:    [[SEL:%.*]] = call i5 @llvm.umin.i5(i5 [[MINMAXOP]], i5 [[Z]])
; CHECK-NEXT:    ret i5 [[SEL]]
;
  %m1 = call i5 @llvm.umin.i5(i5 %x, i5 %z)
  store i5 %m1, i5* %p
  %m2 = call i5 @llvm.umin.i5(i5 %z, i5 %y)
  %sel = select i1 %cond, i5 %m1, i5 %m2
  ret i5 %sel
}

define <3 x i5> @umax_umax_common_op_11(i1 %cond, <3 x i5> %x, <3 x i5> %y, <3 x i5> %z, <3 x i5>* %p) {
; CHECK-LABEL: @umax_umax_common_op_11(
; CHECK-NEXT:    [[M2:%.*]] = call <3 x i5> @llvm.umax.v3i5(<3 x i5> [[Y:%.*]], <3 x i5> [[Z:%.*]])
; CHECK-NEXT:    store <3 x i5> [[M2]], <3 x i5>* [[P:%.*]], align 2
; CHECK-NEXT:    [[MINMAXOP:%.*]] = select i1 [[COND:%.*]], <3 x i5> [[X:%.*]], <3 x i5> [[Y]]
; CHECK-NEXT:    [[SEL:%.*]] = call <3 x i5> @llvm.umax.v3i5(<3 x i5> [[MINMAXOP]], <3 x i5> [[Z]])
; CHECK-NEXT:    ret <3 x i5> [[SEL]]
;
  %m1 = call <3 x i5> @llvm.umax.v3i5(<3 x i5> %x, <3 x i5> %z)
  %m2 = call <3 x i5> @llvm.umax.v3i5(<3 x i5> %y, <3 x i5> %z)
  store <3 x i5> %m2, <3 x i5>* %p
  %sel = select i1 %cond, <3 x i5> %m1, <3 x i5> %m2
  ret <3 x i5> %sel
}

; negative test - intrinsic mismatch

define i5 @smin_umin_common_op_11(i1 %cond, i5 %x, i5 %y, i5 %z) {
; CHECK-LABEL: @smin_umin_common_op_11(
; CHECK-NEXT:    [[M1:%.*]] = call i5 @llvm.smin.i5(i5 [[X:%.*]], i5 [[Z:%.*]])
; CHECK-NEXT:    [[M2:%.*]] = call i5 @llvm.umin.i5(i5 [[Y:%.*]], i5 [[Z]])
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[COND:%.*]], i5 [[M1]], i5 [[M2]]
; CHECK-NEXT:    ret i5 [[SEL]]
;
  %m1 = call i5 @llvm.smin.i5(i5 %x, i5 %z)
  %m2 = call i5 @llvm.umin.i5(i5 %y, i5 %z)
  %sel = select i1 %cond, i5 %m1, i5 %m2
  ret i5 %sel
}

; negative test - require shared operand

define i5 @smin_smin_no_common_op(i1 %cond, i5 %x, i5 %y, i5 %z, i5 %w) {
; CHECK-LABEL: @smin_smin_no_common_op(
; CHECK-NEXT:    [[M1:%.*]] = call i5 @llvm.smin.i5(i5 [[Z:%.*]], i5 [[X:%.*]])
; CHECK-NEXT:    [[M2:%.*]] = call i5 @llvm.smin.i5(i5 [[W:%.*]], i5 [[Y:%.*]])
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[COND:%.*]], i5 [[M1]], i5 [[M2]]
; CHECK-NEXT:    ret i5 [[SEL]]
;
  %m1 = call i5 @llvm.smin.i5(i5 %z, i5 %x)
  %m2 = call i5 @llvm.smin.i5(i5 %w, i5 %y)
  %sel = select i1 %cond, i5 %m1, i5 %m2
  ret i5 %sel
}

; negative test - too many uses

define i5 @umin_umin_common_op_10_uses(i1 %cond, i5 %x, i5 %y, i5 %z, i5* %p1, i5* %p2) {
; CHECK-LABEL: @umin_umin_common_op_10_uses(
; CHECK-NEXT:    [[M1:%.*]] = call i5 @llvm.umin.i5(i5 [[X:%.*]], i5 [[Z:%.*]])
; CHECK-NEXT:    store i5 [[M1]], i5* [[P1:%.*]], align 1
; CHECK-NEXT:    [[M2:%.*]] = call i5 @llvm.umin.i5(i5 [[Z]], i5 [[Y:%.*]])
; CHECK-NEXT:    store i5 [[M2]], i5* [[P2:%.*]], align 1
; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[COND:%.*]], i5 [[M1]], i5 [[M2]]
; CHECK-NEXT:    ret i5 [[SEL]]
;
  %m1 = call i5 @llvm.umin.i5(i5 %x, i5 %z)
  store i5 %m1, i5* %p1
  %m2 = call i5 @llvm.umin.i5(i5 %z, i5 %y)
  store i5 %m2, i5* %p2
  %sel = select i1 %cond, i5 %m1, i5 %m2
  ret i5 %sel
}

define i5 @smin_select_const_const(i1 %b) {
; CHECK-LABEL: @smin_select_const_const(
; CHECK-NEXT:    [[C:%.*]] = select i1 [[B:%.*]], i5 -3, i5 5
; CHECK-NEXT:    ret i5 [[C]]
;
  %s = select i1 %b, i5 -3, i5 8
  %c = call i5 @llvm.smin.i5(i5 %s, i5 5)
  ret i5 %c
}

define <2 x i8> @smax_select_const_const(<2 x i1> %b) {
; CHECK-LABEL: @smax_select_const_const(
; CHECK-NEXT:    [[C:%.*]] = select <2 x i1> [[B:%.*]], <2 x i8> <i8 1, i8 42>, <2 x i8> <i8 5, i8 43>
; CHECK-NEXT:    ret <2 x i8> [[C]]
;
  %s = select <2 x i1> %b, <2 x i8> <i8 1, i8 3>, <2 x i8> <i8 5, i8 43>
  %c = call <2 x i8> @llvm.smax.v2i8(<2 x i8> %s, <2 x i8> <i8 0, i8 42>)
  ret <2 x i8> %c
}

define i5 @umin_select_const_const(i1 %b) {
; CHECK-LABEL: @umin_select_const_const(
; CHECK-NEXT:    [[C:%.*]] = select i1 [[B:%.*]], i5 4, i5 3
; CHECK-NEXT:    ret i5 [[C]]
;
  %s = select i1 %b, i5 8, i5 3
  %c = call i5 @llvm.umin.i5(i5 4, i5 %s)
  ret i5 %c
}

define <3 x i5> @umax_select_const_const(<3 x i1> %b) {
; CHECK-LABEL: @umax_select_const_const(
; CHECK-NEXT:    [[C:%.*]] = select <3 x i1> [[B:%.*]], <3 x i5> <i5 5, i5 8, i5 -16>, <3 x i5> <i5 7, i5 8, i5 -16>
; CHECK-NEXT:    ret <3 x i5> [[C]]
;
  %s = select <3 x i1> %b, <3 x i5> <i5 2, i5 3, i5 4>, <3 x i5> <i5 7, i5 8, i5 9>
  %c = call <3 x i5> @llvm.umax.v3i5(<3 x i5> <i5 5, i5 8, i5 16>, <3 x i5> %s)
  ret <3 x i5> %c
}

define i5 @smin_select_const(i1 %b, i5 %x) {
; CHECK-LABEL: @smin_select_const(
; CHECK-NEXT:    [[TMP1:%.*]] = call i5 @llvm.smin.i5(i5 [[X:%.*]], i5 5)
; CHECK-NEXT:    [[C:%.*]] = select i1 [[B:%.*]], i5 -3, i5 [[TMP1]]
; CHECK-NEXT:    ret i5 [[C]]
;
  %s = select i1 %b, i5 -3, i5 %x
  %c = call i5 @llvm.smin.i5(i5 %s, i5 5)
  ret i5 %c
}

define <2 x i8> @smax_select_const(<2 x i1> %b, <2 x i8> %x) {
; CHECK-LABEL: @smax_select_const(
; CHECK-NEXT:    [[TMP1:%.*]] = call <2 x i8> @llvm.smax.v2i8(<2 x i8> [[X:%.*]], <2 x i8> <i8 0, i8 42>)
; CHECK-NEXT:    [[C:%.*]] = select <2 x i1> [[B:%.*]], <2 x i8> [[TMP1]], <2 x i8> <i8 5, i8 43>
; CHECK-NEXT:    ret <2 x i8> [[C]]
;
  %s = select <2 x i1> %b, <2 x i8> %x, <2 x i8> <i8 5, i8 43>
  %c = call <2 x i8> @llvm.smax.v2i8(<2 x i8> %s, <2 x i8> <i8 0, i8 42>)
  ret <2 x i8> %c
}

define i5 @umin_select_const(i1 %b, i5 %x) {
; CHECK-LABEL: @umin_select_const(
; CHECK-NEXT:    [[TMP1:%.*]] = call i5 @llvm.umin.i5(i5 [[X:%.*]], i5 4)
; CHECK-NEXT:    [[C:%.*]] = select i1 [[B:%.*]], i5 [[TMP1]], i5 3
; CHECK-NEXT:    ret i5 [[C]]
;
  %s = select i1 %b, i5 %x, i5 3
  %c = call i5 @llvm.umin.i5(i5 4, i5 %s)
  ret i5 %c
}

define <3 x i5> @umax_select_const(<3 x i1> %b, <3 x i5> %x) {
; CHECK-LABEL: @umax_select_const(
; CHECK-NEXT:    [[TMP1:%.*]] = call <3 x i5> @llvm.umax.v3i5(<3 x i5> [[X:%.*]], <3 x i5> <i5 5, i5 8, i5 1>)
; CHECK-NEXT:    [[C:%.*]] = select <3 x i1> [[B:%.*]], <3 x i5> <i5 5, i5 8, i5 4>, <3 x i5> [[TMP1]]
; CHECK-NEXT:    ret <3 x i5> [[C]]
;
  %s = select <3 x i1> %b, <3 x i5> <i5 2, i5 3, i5 4>, <3 x i5> %x
  %c = call <3 x i5> @llvm.umax.v3i5(<3 x i5> <i5 5, i5 8, i5 1>, <3 x i5> %s)
  ret <3 x i5> %c
}

declare i32 @llvm.smax.i32(i32, i32);
declare i32 @llvm.smin.i32(i32, i32);
declare i8 @llvm.umax.i8(i8, i8);
declare i8 @llvm.umin.i8(i8, i8);

; Each of the following 4 tests would infinite loop because
; we had conflicting transforms for icmp and select using
; known bits.

define i32 @smax_smin(i32 %x) {
; CHECK-LABEL: @smax_smin(
; CHECK-NEXT:    [[M:%.*]] = call i32 @llvm.smax.i32(i32 [[X:%.*]], i32 0)
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult i32 [[M]], 1
; CHECK-NEXT:    [[S:%.*]] = select i1 [[TMP1]], i32 [[M]], i32 1
; CHECK-NEXT:    ret i32 [[S]]
;
  %m = call i32 @llvm.smax.i32(i32 %x, i32 0)
  %c = icmp slt i32 %x, 1
  %s = select i1 %c, i32 %m, i32 1
  ret i32 %s
}

define i32 @smin_smax(i32 %x) {
; CHECK-LABEL: @smin_smax(
; CHECK-NEXT:    [[M:%.*]] = call i32 @llvm.smin.i32(i32 [[X:%.*]], i32 -1)
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i32 [[M]], -2
; CHECK-NEXT:    [[S:%.*]] = select i1 [[TMP1]], i32 [[M]], i32 -2
; CHECK-NEXT:    ret i32 [[S]]
;
  %m = call i32 @llvm.smin.i32(i32 %x, i32 -1)
  %c = icmp sgt i32 %x, -2
  %s = select i1 %c, i32 %m, i32 -2
  ret i32 %s
}

define i8 @umax_umin(i8 %x) {
; CHECK-LABEL: @umax_umin(
; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 -128)
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ult i8 [[M]], -127
; CHECK-NEXT:    [[S:%.*]] = select i1 [[TMP1]], i8 [[M]], i8 -127
; CHECK-NEXT:    ret i8 [[S]]
;
  %m = call i8 @llvm.umax.i8(i8 %x, i8 128)
  %c = icmp ult i8 %x, 129
  %s = select i1 %c, i8 %m, i8 129
  ret i8 %s
}

define i8 @umin_umax(i8 %x) {
; CHECK-LABEL: @umin_umax(
; CHECK-NEXT:    [[M:%.*]] = call i8 @llvm.umin.i8(i8 [[X:%.*]], i8 127)
; CHECK-NEXT:    [[TMP1:%.*]] = icmp ugt i8 [[M]], 126
; CHECK-NEXT:    [[S:%.*]] = select i1 [[TMP1]], i8 [[M]], i8 126
; CHECK-NEXT:    ret i8 [[S]]
;
  %m = call i8 @llvm.umin.i8(i8 %x, i8 127)
  %c = icmp ugt i8 %x, 126
  %s = select i1 %c, i8 %m, i8 126
  ret i8 %s
}