6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-24 22:24:54 +00:00
Code Issues Projects Releases Wiki Activity

Simplify negated bit test

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170020 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2012-12-12 20:48:54 +00:00
parent 8ceb8b764f
commit 63522b1998
2 changed files with 44 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
test/Transforms/InstCombine/icmp.ll
View File

@@ -677,3 +677,29 @@ define i1 @test66(i64 %A, i64 %B) {
; CHECK-NEXT: ret i1 true
ret i1 %cmp
}
define i1 @test67(i32 %A, i32 %B) {
%neg = xor i32 %A, -1
%shl = shl i32 1, %B
%and = and i32 %shl, %neg
%cmp = icmp ne i32 %and, 0
; CHECK: @test67
; CHECK-NEXT: %shl = shl i32 1, %B
; CHECK-NEXT: %1 = and i32 %shl, %A
; CHECK-NEXT: %cmp = icmp eq i32 %1, 0
; CHECK-NEXT: ret i1 %cmp
ret i1 %cmp
}
define i1 @test68(i32 %A, i32 %B) {
%neg = xor i32 %A, -1
%shl = shl i32 1, %B
%and = and i32 %shl, %neg
%cmp = icmp eq i32 %and, 0
; CHECK: @test68
; CHECK-NEXT: %shl = shl i32 1, %B
; CHECK-NEXT: %1 = and i32 %shl, %A
; CHECK-NEXT: %cmp = icmp ne i32 %1, 0
; CHECK-NEXT: ret i1 %cmp
ret i1 %cmp
}