121 lines
2.0 KiB
LLVM
121 lines
2.0 KiB
LLVM
|
; RUN: llc -mtriple=i686-linux < %s | FileCheck %s
|
||
|
|
|
||
|
|
; Don't rotate the loop if the number of fall through to exit is not larger
|
||
|
|
; than the number of fall through to header.
|
||
|
|
define void @no_rotate() {
|
||
|
|
; CHECK-LABEL: no_rotate
|
||
|
|
; CHECK: %entry
|
||
|
|
; CHECK: %header
|
||
|
|
; CHECK: %middle
|
||
|
|
; CHECK: %latch1
|
||
|
|
; CHECK: %latch2
|
||
|
|
; CHECK: %end
|
||
|
|
entry:
|
||
|
|
br label %header
|
||
|
|
|
||
|
|
header:
|
||
|
|
%val1 = call i1 @foo()
|
||
|
|
br i1 %val1, label %middle, label %end
|
||
|
|
|
||
|
|
middle:
|
||
|
|
%val2 = call i1 @foo()
|
||
|
|
br i1 %val2, label %latch1, label %end
|
||
|
|
|
||
|
|
latch1:
|
||
|
|
%val3 = call i1 @foo()
|
||
|
|
br i1 %val3, label %latch2, label %header
|
||
|
|
|
||
|
|
latch2:
|
||
|
|
%val4 = call i1 @foo()
|
||
|
|
br label %header
|
||
|
|
|
||
|
|
end:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
define void @do_rotate() {
|
||
|
|
; CHECK-LABEL: do_rotate
|
||
|
|
; CHECK: %entry
|
||
|
|
; CHECK: %then
|
||
|
|
; CHECK: %else
|
||
|
|
; CHECK: %latch1
|
||
|
|
; CHECK: %latch2
|
||
|
|
; CHECK: %header
|
||
|
|
; CHECK: %end
|
||
|
|
entry:
|
||
|
|
%val0 = call i1 @foo()
|
||
|
|
br i1 %val0, label %then, label %else
|
||
|
|
|
||
|
|
then:
|
||
|
|
call void @a()
|
||
|
|
br label %header
|
||
|
|
|
||
|
|
else:
|
||
|
|
call void @b()
|
||
|
|
br label %header
|
||
|
|
|
||
|
|
header:
|
||
|
|
%val1 = call i1 @foo()
|
||
|
|
br i1 %val1, label %latch1, label %end
|
||
|
|
|
||
|
|
latch1:
|
||
|
|
%val3 = call i1 @foo()
|
||
|
|
br i1 %val3, label %latch2, label %header
|
||
|
|
|
||
|
|
latch2:
|
||
|
|
%val4 = call i1 @foo()
|
||
|
|
br label %header
|
||
|
|
|
||
|
|
end:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
; The loop structure is same as in @no_rotate, but the loop header's predecessor
|
||
|
|
; doesn't fall through to it, so it should be rotated to get exit fall through.
|
||
|
|
define void @do_rotate2() {
|
||
|
|
; CHECK-LABEL: do_rotate2
|
||
|
|
; CHECK: %entry
|
||
|
|
; CHECK: %then
|
||
|
|
; CHECK: %middle
|
||
|
|
; CHECK: %latch1
|
||
|
|
; CHECK: %latch2
|
||
|
|
; CHECK: %header
|
||
|
|
; CHECK: %exit
|
||
|
|
entry:
|
||
|
|
%val0 = call i1 @foo()
|
||
|
|
br i1 %val0, label %then, label %header, !prof !1
|
||
|
|
|
||
|
|
then:
|
||
|
|
call void @a()
|
||
|
|
br label %end
|
||
|
|
|
||
|
|
header:
|
||
|
|
%val1 = call i1 @foo()
|
||
|
|
br i1 %val1, label %middle, label %exit
|
||
|
|
|
||
|
|
middle:
|
||
|
|
%val2 = call i1 @foo()
|
||
|
|
br i1 %val2, label %latch1, label %exit
|
||
|
|
|
||
|
|
latch1:
|
||
|
|
%val3 = call i1 @foo()
|
||
|
|
br i1 %val3, label %latch2, label %header
|
||
|
|
|
||
|
|
latch2:
|
||
|
|
%val4 = call i1 @foo()
|
||
|
|
br label %header
|
||
|
|
|
||
|
|
exit:
|
||
|
|
call void @b()
|
||
|
|
br label %end
|
||
|
|
|
||
|
|
end:
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
declare i1 @foo()
|
||
|
|
declare void @a()
|
||
|
|
declare void @b()
|
||
|
|
|
||
|
|
!1 = !{!"branch_weights", i32 10, i32 1}
|