72 lines
1.5 KiB
LLVM
72 lines
1.5 KiB
LLVM
; RUN: opt < %s -O1 -S | FileCheck %s
|
|
|
|
; The attribute nomerge prevents the 3 bar() calls from being sunk/hoisted into
|
|
; one inside a function. Check that there are still 3 tail calls.
|
|
|
|
; Test case for preventing sinking
|
|
; CHECK-LABEL: define void @sink
|
|
; CHECK: if.then:
|
|
; CHECK-NEXT: tail call void @bar()
|
|
; CHECK: if.then2:
|
|
; CHECK-NEXT: tail call void @bar()
|
|
; CHECK: if.end3:
|
|
; CHECK-NEXT: tail call void @bar()
|
|
define void @sink(i32 %i) {
|
|
entry:
|
|
switch i32 %i, label %if.end3 [
|
|
i32 5, label %if.then
|
|
i32 7, label %if.then2
|
|
]
|
|
|
|
if.then:
|
|
tail call void @bar() #0
|
|
br label %if.end3
|
|
|
|
if.then2:
|
|
tail call void @bar() #0
|
|
br label %if.end3
|
|
|
|
if.end3:
|
|
tail call void @bar() #0
|
|
ret void
|
|
}
|
|
|
|
; Test case for preventing hoisting
|
|
; CHECK-LABEL: define void @hoist
|
|
; CHECK: if.then:
|
|
; CHECK-NEXT: tail call void @bar()
|
|
; CHECK: if.then2:
|
|
; CHECK-NEXT: tail call void @bar()
|
|
; CHECK: if.end:
|
|
; CHECK-NEXT: tail call void @bar()
|
|
define void @hoist(i32 %i) {
|
|
entry:
|
|
%i.addr = alloca i32, align 4
|
|
store i32 %i, i32* %i.addr, align 4
|
|
%0 = load i32, i32* %i.addr, align 4
|
|
%cmp = icmp eq i32 %0, 5
|
|
br i1 %cmp, label %if.then, label %if.else
|
|
|
|
if.then:
|
|
tail call void @bar() #1
|
|
unreachable
|
|
|
|
if.else:
|
|
%1 = load i32, i32* %i.addr, align 4
|
|
%cmp1 = icmp eq i32 %i, 7
|
|
br i1 %cmp1, label %if.then2, label %if.end
|
|
|
|
if.then2:
|
|
tail call void @bar() #1
|
|
unreachable
|
|
|
|
if.end:
|
|
tail call void @bar() #1
|
|
unreachable
|
|
}
|
|
|
|
declare void @bar()
|
|
|
|
attributes #0 = { nomerge }
|
|
attributes #1 = { noreturn nomerge }
|