forked from OSchip/llvm-project
82 lines
2.0 KiB
LLVM
82 lines
2.0 KiB
LLVM
|
; RUN: llc -mtriple=x86_64-linux-gnu %s -o - -jump-table-density=25 | FileCheck %s --check-prefix=DENSE --check-prefix=CHECK
|
||
|
|
; RUN: llc -mtriple=x86_64-linux-gnu %s -o - -jump-table-density=10 | FileCheck %s --check-prefix=SPARSE --check-prefix=CHECK
|
||
|
|
|
||
|
|
declare void @g(i32)
|
||
|
|
|
||
|
|
define void @sparse(i32 %x) {
|
||
|
|
entry:
|
||
|
|
switch i32 %x, label %return [
|
||
|
|
i32 300, label %bb0
|
||
|
|
i32 100, label %bb1
|
||
|
|
i32 400, label %bb1
|
||
|
|
i32 500, label %bb2
|
||
|
|
]
|
||
|
|
bb0: tail call void @g(i32 0) br label %return
|
||
|
|
bb1: tail call void @g(i32 1) br label %return
|
||
|
|
bb2: tail call void @g(i32 1) br label %return
|
||
|
|
return: ret void
|
||
|
|
|
||
|
|
; Should pivot around 400 for two subtrees with two jump tables each.
|
||
|
|
; CHECK-LABEL: sparse
|
||
|
|
; CHECK-NOT: cmpl
|
||
|
|
; CHECK: cmpl $399
|
||
|
|
; CHECK: cmpl $100
|
||
|
|
; CHECK: cmpl $300
|
||
|
|
; CHECK: cmpl $400
|
||
|
|
; CHECK: cmpl $500
|
||
|
|
}
|
||
|
|
|
||
|
|
define void @med(i32 %x) {
|
||
|
|
entry:
|
||
|
|
switch i32 %x, label %return [
|
||
|
|
i32 30, label %bb0
|
||
|
|
i32 10, label %bb1
|
||
|
|
i32 40, label %bb1
|
||
|
|
i32 50, label %bb2
|
||
|
|
i32 20, label %bb3
|
||
|
|
]
|
||
|
|
bb0: tail call void @g(i32 0) br label %return
|
||
|
|
bb1: tail call void @g(i32 1) br label %return
|
||
|
|
bb2: tail call void @g(i32 1) br label %return
|
||
|
|
bb3: tail call void @g(i32 2) br label %return
|
||
|
|
return: ret void
|
||
|
|
|
||
|
|
; Lowered as a jump table when sparse, and branches when dense.
|
||
|
|
; CHECK-LABEL: med
|
||
|
|
; SPARSE: addl $-10
|
||
|
|
; SPARSE: cmpl $40
|
||
|
|
; SPARSE: ja
|
||
|
|
; SPARSE: jmpq *.LJTI
|
||
|
|
; DENSE-NOT: cmpl
|
||
|
|
; DENSE: cmpl $29
|
||
|
|
; DENSE-DAG: cmpl $10
|
||
|
|
; DENSE-DAG: cmpl $20
|
||
|
|
; DENSE-DAG: cmpl $30
|
||
|
|
; DENSE-DAG: cmpl $40
|
||
|
|
; DENSE-DAG: cmpl $50
|
||
|
|
; DENSE: retq
|
||
|
|
}
|
||
|
|
|
||
|
|
define void @dense(i32 %x) {
|
||
|
|
entry:
|
||
|
|
switch i32 %x, label %return [
|
||
|
|
i32 12, label %bb0
|
||
|
|
i32 4, label %bb1
|
||
|
|
i32 16, label %bb1
|
||
|
|
i32 20, label %bb2
|
||
|
|
i32 8, label %bb3
|
||
|
|
]
|
||
|
|
bb0: tail call void @g(i32 0) br label %return
|
||
|
|
bb1: tail call void @g(i32 1) br label %return
|
||
|
|
bb2: tail call void @g(i32 1) br label %return
|
||
|
|
bb3: tail call void @g(i32 2) br label %return
|
||
|
|
return: ret void
|
||
|
|
|
||
|
|
; Lowered as a jump table when sparse, and branches when dense.
|
||
|
|
; CHECK-LABEL: dense
|
||
|
|
; CHECK: addl $-4
|
||
|
|
; CHECK: cmpl $16
|
||
|
|
; CHECK: ja
|
||
|
|
; CHECK: jmpq *.LJTI
|
||
|
|
}
|