mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 20:29:48 +00:00
5182ad54b2
Fixes the self-host fail. Note that this commit activates dominator analysis in the combiner by default (like the original commit did). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222590 91177308-0d34-0410-b5e6-96231b3b80d8
51 lines
1.2 KiB
LLVM
51 lines
1.2 KiB
LLVM
; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -instcombine -S | FileCheck %s
|
|
; Checks that the select-icmp optimization is safe in two cases
|
|
declare void @foo(i32)
|
|
declare i32 @bar(i32)
|
|
|
|
; don't replace 'cond' by 'len' in the home block ('bb') that
|
|
; contains the select
|
|
define void @test1(i32 %len) {
|
|
entry:
|
|
br label %bb
|
|
|
|
bb:
|
|
%cmp = icmp ult i32 %len, 8
|
|
%cond = select i1 %cmp, i32 %len, i32 8
|
|
call void @foo(i32 %cond)
|
|
%cmp11 = icmp eq i32 %cond, 8
|
|
br i1 %cmp11, label %for.end, label %bb
|
|
|
|
for.end:
|
|
ret void
|
|
; CHECK: select
|
|
; CHECK: icmp eq i32 %cond, 8
|
|
}
|
|
|
|
; don't replace 'cond' by 'len' in a block ('b1') that dominates all uses
|
|
; of the select outside the home block ('bb'), but can be reached from the home
|
|
; block on another path ('bb -> b0 -> b1')
|
|
define void @test2(i32 %len) {
|
|
entry:
|
|
%0 = call i32 @bar(i32 %len);
|
|
%cmp = icmp ult i32 %len, 4
|
|
br i1 %cmp, label %bb, label %b1
|
|
bb:
|
|
%cond = select i1 %cmp, i32 %len, i32 8
|
|
%cmp11 = icmp eq i32 %cond, 8
|
|
br i1 %cmp11, label %b0, label %b1
|
|
|
|
b0:
|
|
call void @foo(i32 %len)
|
|
br label %b1
|
|
|
|
b1:
|
|
; CHECK: phi i32 [ %cond, %bb ], [ undef, %b0 ], [ %0, %entry ]
|
|
%1 = phi i32 [ %cond, %bb ], [ undef, %b0 ], [ %0, %entry ]
|
|
br label %ret
|
|
|
|
ret:
|
|
call void @foo(i32 %1)
|
|
ret void
|
|
}
|