forked from OSchip/llvm-project
224 lines
5.7 KiB
LLVM
224 lines
5.7 KiB
LLVM
; 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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define i32 @fold(i32 %x) {
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; CHECK-LABEL: @fold(
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; CHECK-NEXT: [[Y:%.*]] = freeze i32 [[X:%.*]]
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; CHECK-NEXT: ret i32 [[Y]]
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;
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%y = freeze i32 %x
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%z = freeze i32 %y
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ret i32 %z
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}
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define i32 @make_const() {
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; CHECK-LABEL: @make_const(
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; CHECK-NEXT: ret i32 10
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;
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%x = freeze i32 10
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ret i32 %x
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}
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define i32 @and_freeze_undef(i32 %x) {
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; CHECK-LABEL: @and_freeze_undef(
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; CHECK-NEXT: ret i32 0
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;
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%f = freeze i32 undef
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%res = and i32 %x, %f
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ret i32 %res
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}
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declare void @use_i32(i32)
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define i32 @and_freeze_undef_multipleuses(i32 %x) {
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; CHECK-LABEL: @and_freeze_undef_multipleuses(
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; CHECK-NEXT: call void @use_i32(i32 0)
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; CHECK-NEXT: ret i32 0
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;
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%f = freeze i32 undef
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%res = and i32 %x, %f
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call void @use_i32(i32 %f)
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ret i32 %res
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}
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define i32 @or_freeze_undef(i32 %x) {
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; CHECK-LABEL: @or_freeze_undef(
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; CHECK-NEXT: ret i32 -1
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;
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%f = freeze i32 undef
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%res = or i32 %x, %f
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ret i32 %res
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}
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define i32 @or_freeze_undef_multipleuses(i32 %x) {
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; CHECK-LABEL: @or_freeze_undef_multipleuses(
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; CHECK-NEXT: call void @use_i32(i32 0)
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; CHECK-NEXT: ret i32 [[X:%.*]]
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;
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%f = freeze i32 undef
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%res = or i32 %x, %f
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call void @use_i32(i32 %f)
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ret i32 %res
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}
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declare void @use_i32_i1(i32, i1)
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define void @or_select_multipleuses(i32 %x, i1 %y) {
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; CHECK-LABEL: @or_select_multipleuses(
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; CHECK-NEXT: call void @use_i32_i1(i32 32, i1 [[Y:%.*]])
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; CHECK-NEXT: ret void
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;
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%f = freeze i1 undef
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%a = select i1 %f, i32 %x, i32 32 ; prefers %f to be false
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%b = or i1 %f, %y ; prefers %f to be true
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call void @use_i32_i1(i32 %a, i1 %b)
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ret void
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}
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define void @or_select_multipleuses_logical(i32 %x, i1 %y) {
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; CHECK-LABEL: @or_select_multipleuses_logical(
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; CHECK-NEXT: call void @use_i32_i1(i32 32, i1 [[Y:%.*]])
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; CHECK-NEXT: ret void
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;
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%f = freeze i1 undef
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%a = select i1 %f, i32 %x, i32 32 ; prefers %f to be false
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%b = select i1 %f, i1 true, i1 %y ; prefers %f to be true
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call void @use_i32_i1(i32 %a, i1 %b)
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ret void
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}
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; Move the freeze forward to prevent poison from spreading.
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define i32 @early_freeze_test1(i32 %x, i32 %y) {
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; CHECK-LABEL: @early_freeze_test1(
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; CHECK-NEXT: [[V1:%.*]] = add i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[V1_FR:%.*]] = freeze i32 [[V1]]
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; CHECK-NEXT: [[V2:%.*]] = shl i32 [[V1_FR]], 1
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; CHECK-NEXT: [[V3:%.*]] = and i32 [[V2]], 2
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; CHECK-NEXT: ret i32 [[V3]]
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;
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%v1 = add i32 %x, %y
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%v2 = shl i32 %v1, 1
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%v3 = and i32 %v2, 2
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%v3.fr = freeze i32 %v3
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ret i32 %v3.fr
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}
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define i1 @early_freeze_test2(i32* %ptr) {
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; CHECK-LABEL: @early_freeze_test2(
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; CHECK-NEXT: [[V1:%.*]] = load i32, i32* [[PTR:%.*]], align 4
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; CHECK-NEXT: [[V1_FR:%.*]] = freeze i32 [[V1]]
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; CHECK-NEXT: [[V2:%.*]] = and i32 [[V1_FR]], 1
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; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[V2]], 0
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; CHECK-NEXT: ret i1 [[COND]]
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;
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%v1 = load i32, i32* %ptr
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%v2 = and i32 %v1, 1
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%cond = icmp eq i32 %v2, 0
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%cond.fr = freeze i1 %cond
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ret i1 %cond.fr
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}
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; add can overflows, so we cannot move freeze beyond add
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define i32 @early_freeze_test3(i32 %v1) {
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; CHECK-LABEL: @early_freeze_test3(
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; CHECK-NEXT: [[V2:%.*]] = shl i32 [[V1:%.*]], 1
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; CHECK-NEXT: [[V3:%.*]] = add nuw i32 [[V2]], 2
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; CHECK-NEXT: [[V3_FR:%.*]] = freeze i32 [[V3]]
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; CHECK-NEXT: [[V4:%.*]] = or i32 [[V3_FR]], 1
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; CHECK-NEXT: ret i32 [[V4]]
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;
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%v2 = shl i32 %v1, 1
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%v3 = add nuw i32 %v2, 2
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%v4 = or i32 %v3, 1
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%v4.fr = freeze i32 %v4
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ret i32 %v4.fr
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}
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; If replace all dominated uses of v to freeze(v).
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define void @freeze_dominated_uses_test1(i32 %v) {
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; CHECK-LABEL: @freeze_dominated_uses_test1(
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; CHECK-NEXT: [[V_FR:%.*]] = freeze i32 [[V:%.*]]
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; CHECK-NEXT: call void @use_i32(i32 [[V_FR]])
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; CHECK-NEXT: call void @use_i32(i32 [[V_FR]])
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; CHECK-NEXT: ret void
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;
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%v.fr = freeze i32 %v
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call void @use_i32(i32 %v)
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call void @use_i32(i32 %v.fr)
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ret void
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}
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define void @freeze_dominated_uses_test2(i32 %v) {
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; CHECK-LABEL: @freeze_dominated_uses_test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @use_i32(i32 [[V:%.*]])
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; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[V]], 0
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; CHECK-NEXT: br i1 [[COND]], label [[BB0:%.*]], label [[BB1:%.*]]
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; CHECK: bb0:
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; CHECK-NEXT: [[V_FR:%.*]] = freeze i32 [[V]]
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; CHECK-NEXT: call void @use_i32(i32 [[V_FR]])
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; CHECK-NEXT: call void @use_i32(i32 [[V_FR]])
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; CHECK-NEXT: br label [[END:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: call void @use_i32(i32 [[V]])
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: ret void
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;
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entry:
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call void @use_i32(i32 %v)
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%cond = icmp eq i32 %v, 0
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br i1 %cond, label %bb0, label %bb1
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bb0:
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%v.fr = freeze i32 %v
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call void @use_i32(i32 %v.fr)
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call void @use_i32(i32 %v)
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br label %end
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bb1:
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call void @use_i32(i32 %v)
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br label %end
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end:
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ret void
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}
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; If there is a duplicate freeze, it will be removed.
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define void @freeze_dominated_uses_test3(i32 %v, i1 %cond) {
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; CHECK-LABEL: @freeze_dominated_uses_test3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[V_FR1:%.*]] = freeze i32 [[V:%.*]]
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; CHECK-NEXT: call void @use_i32(i32 [[V_FR1]])
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[BB0:%.*]], label [[BB1:%.*]]
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; CHECK: bb0:
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; CHECK-NEXT: call void @use_i32(i32 [[V_FR1]])
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; CHECK-NEXT: br label [[END:%.*]]
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; CHECK: bb1:
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; CHECK-NEXT: call void @use_i32(i32 [[V_FR1]])
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: ret void
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;
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entry:
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%v.fr1 = freeze i32 %v
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call void @use_i32(i32 %v.fr1)
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br i1 %cond, label %bb0, label %bb1
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bb0:
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%v.fr2 = freeze i32 %v
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call void @use_i32(i32 %v.fr2)
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br label %end
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bb1:
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call void @use_i32(i32 %v)
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br label %end
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end:
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ret void
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}
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