248 lines
6.3 KiB
LLVM
248 lines
6.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt %s -S -passes='simplify-cfg<switch-to-lookup>' | FileCheck %s
|
|
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
|
|
declare void @foo(i32)
|
|
|
|
define void @test(i1 %a) {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NEXT: [[A_OFF:%.*]] = add i1 [[A:%.*]], true
|
|
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i1 [[A_OFF]], true
|
|
; CHECK-NEXT: br i1 [[SWITCH]], label [[TRUE:%.*]], label [[FALSE:%.*]]
|
|
; CHECK: true:
|
|
; CHECK-NEXT: call void @foo(i32 1)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: false:
|
|
; CHECK-NEXT: call void @foo(i32 3)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
switch i1 %a, label %default [i1 1, label %true
|
|
i1 0, label %false]
|
|
true:
|
|
call void @foo(i32 1)
|
|
ret void
|
|
false:
|
|
call void @foo(i32 3)
|
|
ret void
|
|
default:
|
|
call void @foo(i32 2)
|
|
ret void
|
|
}
|
|
|
|
define void @test2(i2 %a) {
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK-NEXT: switch i2 [[A:%.*]], label [[DEFAULT1:%.*]] [
|
|
; CHECK-NEXT: i2 0, label [[CASE0:%.*]]
|
|
; CHECK-NEXT: i2 1, label [[CASE1:%.*]]
|
|
; CHECK-NEXT: i2 -2, label [[CASE2:%.*]]
|
|
; CHECK-NEXT: i2 -1, label [[CASE3:%.*]]
|
|
; CHECK-NEXT: ]
|
|
; CHECK: case0:
|
|
; CHECK-NEXT: call void @foo(i32 0)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: case1:
|
|
; CHECK-NEXT: call void @foo(i32 1)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: case2:
|
|
; CHECK-NEXT: call void @foo(i32 2)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: case3:
|
|
; CHECK-NEXT: call void @foo(i32 3)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: default1:
|
|
; CHECK-NEXT: unreachable
|
|
;
|
|
switch i2 %a, label %default [i2 0, label %case0
|
|
i2 1, label %case1
|
|
i2 2, label %case2
|
|
i2 3, label %case3]
|
|
case0:
|
|
call void @foo(i32 0)
|
|
ret void
|
|
case1:
|
|
call void @foo(i32 1)
|
|
ret void
|
|
case2:
|
|
call void @foo(i32 2)
|
|
ret void
|
|
case3:
|
|
call void @foo(i32 3)
|
|
ret void
|
|
default:
|
|
call void @foo(i32 4)
|
|
ret void
|
|
}
|
|
|
|
; This one is a negative test - we know the value of the default,
|
|
; but that's about it
|
|
define void @test3(i2 %a) {
|
|
; CHECK-LABEL: @test3(
|
|
; CHECK-NEXT: switch i2 [[A:%.*]], label [[DEFAULT:%.*]] [
|
|
; CHECK-NEXT: i2 0, label [[CASE0:%.*]]
|
|
; CHECK-NEXT: i2 1, label [[CASE1:%.*]]
|
|
; CHECK-NEXT: i2 -2, label [[CASE2:%.*]]
|
|
; CHECK-NEXT: ]
|
|
; CHECK: case0:
|
|
; CHECK-NEXT: call void @foo(i32 0)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: case1:
|
|
; CHECK-NEXT: call void @foo(i32 1)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: case2:
|
|
; CHECK-NEXT: call void @foo(i32 2)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: default:
|
|
; CHECK-NEXT: call void @foo(i32 0)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
switch i2 %a, label %default [i2 0, label %case0
|
|
i2 1, label %case1
|
|
i2 2, label %case2]
|
|
|
|
case0:
|
|
call void @foo(i32 0)
|
|
ret void
|
|
case1:
|
|
call void @foo(i32 1)
|
|
ret void
|
|
case2:
|
|
call void @foo(i32 2)
|
|
ret void
|
|
default:
|
|
call void @foo(i32 0)
|
|
ret void
|
|
}
|
|
|
|
; Negative test - check for possible overflow when computing
|
|
; number of possible cases.
|
|
define void @test4(i128 %a) {
|
|
; CHECK-LABEL: @test4(
|
|
; CHECK-NEXT: switch i128 [[A:%.*]], label [[DEFAULT:%.*]] [
|
|
; CHECK-NEXT: i128 0, label [[CASE0:%.*]]
|
|
; CHECK-NEXT: i128 1, label [[CASE1:%.*]]
|
|
; CHECK-NEXT: ]
|
|
; CHECK: case0:
|
|
; CHECK-NEXT: call void @foo(i32 0)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: case1:
|
|
; CHECK-NEXT: call void @foo(i32 1)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: default:
|
|
; CHECK-NEXT: call void @foo(i32 0)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
switch i128 %a, label %default [i128 0, label %case0
|
|
i128 1, label %case1]
|
|
|
|
case0:
|
|
call void @foo(i32 0)
|
|
ret void
|
|
case1:
|
|
call void @foo(i32 1)
|
|
ret void
|
|
default:
|
|
call void @foo(i32 0)
|
|
ret void
|
|
}
|
|
|
|
; All but one bit known zero
|
|
define void @test5(i8 %a) {
|
|
; CHECK-LABEL: @test5(
|
|
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i8 [[A:%.*]], 2
|
|
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
|
|
; CHECK-NEXT: [[A_OFF:%.*]] = add i8 [[A]], -1
|
|
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i8 [[A_OFF]], 1
|
|
; CHECK-NEXT: br i1 [[SWITCH]], label [[TRUE:%.*]], label [[FALSE:%.*]]
|
|
; CHECK: true:
|
|
; CHECK-NEXT: call void @foo(i32 1)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: false:
|
|
; CHECK-NEXT: call void @foo(i32 3)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%cmp = icmp ult i8 %a, 2
|
|
call void @llvm.assume(i1 %cmp)
|
|
switch i8 %a, label %default [i8 1, label %true
|
|
i8 0, label %false]
|
|
true:
|
|
call void @foo(i32 1)
|
|
ret void
|
|
false:
|
|
call void @foo(i32 3)
|
|
ret void
|
|
default:
|
|
call void @foo(i32 2)
|
|
ret void
|
|
}
|
|
|
|
;; All but one bit known one
|
|
define void @test6(i8 %a) {
|
|
; CHECK-LABEL: @test6(
|
|
; CHECK-NEXT: [[AND:%.*]] = and i8 [[A:%.*]], -2
|
|
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[AND]], -2
|
|
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
|
|
; CHECK-NEXT: [[A_OFF:%.*]] = add i8 [[A]], 1
|
|
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i8 [[A_OFF]], 1
|
|
; CHECK-NEXT: br i1 [[SWITCH]], label [[TRUE:%.*]], label [[FALSE:%.*]]
|
|
; CHECK: true:
|
|
; CHECK-NEXT: call void @foo(i32 1)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: false:
|
|
; CHECK-NEXT: call void @foo(i32 3)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%and = and i8 %a, 254
|
|
%cmp = icmp eq i8 %and, 254
|
|
call void @llvm.assume(i1 %cmp)
|
|
switch i8 %a, label %default [i8 255, label %true
|
|
i8 254, label %false]
|
|
true:
|
|
call void @foo(i32 1)
|
|
ret void
|
|
false:
|
|
call void @foo(i32 3)
|
|
ret void
|
|
default:
|
|
call void @foo(i32 2)
|
|
ret void
|
|
}
|
|
|
|
; Check that we can eliminate both dead cases and dead defaults
|
|
; within a single run of simplify-cfg
|
|
define void @test7(i8 %a) {
|
|
; CHECK-LABEL: @test7(
|
|
; CHECK-NEXT: [[AND:%.*]] = and i8 [[A:%.*]], -2
|
|
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i8 [[AND]], -2
|
|
; CHECK-NEXT: call void @llvm.assume(i1 [[CMP]])
|
|
; CHECK-NEXT: [[A_OFF:%.*]] = add i8 [[A]], 1
|
|
; CHECK-NEXT: [[SWITCH:%.*]] = icmp ult i8 [[A_OFF]], 1
|
|
; CHECK-NEXT: br i1 [[SWITCH]], label [[TRUE:%.*]], label [[FALSE:%.*]]
|
|
; CHECK: true:
|
|
; CHECK-NEXT: call void @foo(i32 1)
|
|
; CHECK-NEXT: ret void
|
|
; CHECK: false:
|
|
; CHECK-NEXT: call void @foo(i32 3)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%and = and i8 %a, 254
|
|
%cmp = icmp eq i8 %and, 254
|
|
call void @llvm.assume(i1 %cmp)
|
|
switch i8 %a, label %default [i8 255, label %true
|
|
i8 254, label %false
|
|
i8 0, label %also_dead]
|
|
true:
|
|
call void @foo(i32 1)
|
|
ret void
|
|
false:
|
|
call void @foo(i32 3)
|
|
ret void
|
|
also_dead:
|
|
call void @foo(i32 5)
|
|
ret void
|
|
default:
|
|
call void @foo(i32 2)
|
|
ret void
|
|
}
|
|
|
|
declare void @llvm.assume(i1)
|
|
|