mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 03:33:20 +01:00
142 lines
3.4 KiB
LLVM
142 lines
3.4 KiB
LLVM
; RUN: opt < %s -simplifycfg -S | FileCheck -enable-var-scope %s
|
|
|
|
; Test basic folding to a conditional branch.
|
|
define i32 @foo(i64 %x, i64 %y) nounwind {
|
|
; CHECK-LABEL: @foo(
|
|
entry:
|
|
%eq = icmp eq i64 %x, %y
|
|
br i1 %eq, label %b, label %switch
|
|
switch:
|
|
%lt = icmp slt i64 %x, %y
|
|
; CHECK: br i1 %lt, label %a, label %b
|
|
%qux = select i1 %lt, i32 0, i32 2
|
|
switch i32 %qux, label %bees [
|
|
i32 0, label %a
|
|
i32 1, label %b
|
|
i32 2, label %b
|
|
]
|
|
a:
|
|
tail call void @bees.a() nounwind
|
|
ret i32 1
|
|
; CHECK: b:
|
|
; CHECK-NEXT: %retval = phi i32 [ 0, %switch ], [ 2, %entry ]
|
|
b:
|
|
%retval = phi i32 [0, %switch], [0, %switch], [2, %entry]
|
|
tail call void @bees.b() nounwind
|
|
ret i32 %retval
|
|
; CHECK-NOT: bees:
|
|
bees:
|
|
tail call void @llvm.trap() nounwind
|
|
unreachable
|
|
}
|
|
|
|
; Test basic folding to an unconditional branch.
|
|
define i32 @bar(i64 %x, i64 %y) nounwind {
|
|
; CHECK-LABEL: @bar(
|
|
entry:
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: tail call void @bees.a() [[$NUW:#[0-9]+]]
|
|
; CHECK-NEXT: ret i32 0
|
|
%lt = icmp slt i64 %x, %y
|
|
%qux = select i1 %lt, i32 0, i32 2
|
|
switch i32 %qux, label %bees [
|
|
i32 0, label %a
|
|
i32 1, label %b
|
|
i32 2, label %a
|
|
]
|
|
a:
|
|
%retval = phi i32 [0, %entry], [0, %entry], [1, %b]
|
|
tail call void @bees.a() nounwind
|
|
ret i32 0
|
|
b:
|
|
tail call void @bees.b() nounwind
|
|
br label %a
|
|
bees:
|
|
tail call void @llvm.trap() nounwind
|
|
unreachable
|
|
}
|
|
|
|
; Test the edge case where both values from the select are the default case.
|
|
define void @bazz(i64 %x, i64 %y) nounwind {
|
|
; CHECK-LABEL: @bazz(
|
|
entry:
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: tail call void @bees.b() [[$NUW]]
|
|
; CHECK-NEXT: ret void
|
|
%lt = icmp slt i64 %x, %y
|
|
%qux = select i1 %lt, i32 10, i32 12
|
|
switch i32 %qux, label %b [
|
|
i32 0, label %a
|
|
i32 1, label %bees
|
|
i32 2, label %bees
|
|
]
|
|
a:
|
|
tail call void @bees.a() nounwind
|
|
ret void
|
|
b:
|
|
tail call void @bees.b() nounwind
|
|
ret void
|
|
bees:
|
|
tail call void @llvm.trap()
|
|
unreachable
|
|
}
|
|
|
|
; Test the edge case where both values from the select are equal.
|
|
define void @quux(i64 %x, i64 %y) nounwind {
|
|
; CHECK-LABEL: @quux(
|
|
entry:
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: tail call void @bees.a() [[$NUW]]
|
|
; CHECK-NEXT: ret void
|
|
%lt = icmp slt i64 %x, %y
|
|
%qux = select i1 %lt, i32 0, i32 0
|
|
switch i32 %qux, label %b [
|
|
i32 0, label %a
|
|
i32 1, label %bees
|
|
i32 2, label %bees
|
|
]
|
|
a:
|
|
tail call void @bees.a() nounwind
|
|
ret void
|
|
b:
|
|
tail call void @bees.b() nounwind
|
|
ret void
|
|
bees:
|
|
tail call void @llvm.trap()
|
|
unreachable
|
|
}
|
|
|
|
; A final test, for phi node munging.
|
|
define i32 @xyzzy(i64 %x, i64 %y) {
|
|
; CHECK-LABEL: @xyzzy(
|
|
entry:
|
|
%eq = icmp eq i64 %x, %y
|
|
br i1 %eq, label %r, label %cont
|
|
cont:
|
|
; CHECK: %lt = icmp slt i64 %x, %y
|
|
%lt = icmp slt i64 %x, %y
|
|
; CHECK-NEXT: select i1 %lt, i32 -1, i32 1
|
|
%qux = select i1 %lt, i32 0, i32 2
|
|
switch i32 %qux, label %bees [
|
|
i32 0, label %a
|
|
i32 1, label %r
|
|
i32 2, label %r
|
|
]
|
|
r:
|
|
%val = phi i32 [0, %entry], [1, %cont], [1, %cont]
|
|
ret i32 %val
|
|
a:
|
|
ret i32 -1
|
|
; CHECK-NOT: bees:
|
|
bees:
|
|
tail call void @llvm.trap()
|
|
unreachable
|
|
}
|
|
|
|
declare void @llvm.trap() nounwind noreturn
|
|
declare void @bees.a() nounwind
|
|
declare void @bees.b() nounwind
|
|
|
|
; CHECK: attributes [[$NUW]] = { nounwind }
|
|
; CHECK: attributes #1 = { noreturn nounwind }
|