mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-30 03:29:23 +00:00
0513059726
where some fact lake a=b dominates a use in a phi, but doesn't dominate the basic block itself. This feature could also be implemented by splitting critical edges, but at least with the current algorithm reasoning about the dominance directly is faster. The time for running "opt -O2" in the testcase in pr10584 is 1.003 times slower and on gcc as a single file it is 1.0007 times faster. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162023 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
1.1 KiB
LLVM
61 lines
1.1 KiB
LLVM
; RUN: opt %s -gvn -S -o - | FileCheck %s
|
|
|
|
define i32 @f1(i32 %x) {
|
|
; CHECK: define i32 @f1(
|
|
bb0:
|
|
%cmp = icmp eq i32 %x, 0
|
|
br i1 %cmp, label %bb2, label %bb1
|
|
bb1:
|
|
br label %bb2
|
|
bb2:
|
|
%cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
|
|
%foo = add i32 %cond, %x
|
|
ret i32 %foo
|
|
; CHECK: bb2:
|
|
; CHECK: ret i32 %x
|
|
}
|
|
|
|
define i32 @f2(i32 %x) {
|
|
; CHECK: define i32 @f2(
|
|
bb0:
|
|
%cmp = icmp ne i32 %x, 0
|
|
br i1 %cmp, label %bb1, label %bb2
|
|
bb1:
|
|
br label %bb2
|
|
bb2:
|
|
%cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
|
|
%foo = add i32 %cond, %x
|
|
ret i32 %foo
|
|
; CHECK: bb2:
|
|
; CHECK: ret i32 %x
|
|
}
|
|
|
|
define i32 @f3(i32 %x) {
|
|
; CHECK: define i32 @f3(
|
|
bb0:
|
|
switch i32 %x, label %bb1 [ i32 0, label %bb2]
|
|
bb1:
|
|
br label %bb2
|
|
bb2:
|
|
%cond = phi i32 [ %x, %bb0 ], [ 0, %bb1 ]
|
|
%foo = add i32 %cond, %x
|
|
ret i32 %foo
|
|
; CHECK: bb2:
|
|
; CHECK: ret i32 %x
|
|
}
|
|
|
|
declare void @g(i1)
|
|
define void @f4(i8 * %x) {
|
|
; CHECK: define void @f4(
|
|
bb0:
|
|
%y = icmp eq i8* null, %x
|
|
br i1 %y, label %bb2, label %bb1
|
|
bb1:
|
|
br label %bb2
|
|
bb2:
|
|
%zed = icmp eq i8* null, %x
|
|
call void @g(i1 %zed)
|
|
; CHECK: call void @g(i1 %y)
|
|
ret void
|
|
}
|