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optimize comparisons against cttz/ctlz/ctpop, patch by Alastair Lynn!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92745 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-01-05 18:09:56 +00:00
parent aceba31b7a
commit 033574074d
2 changed files with 49 additions and 5 deletions
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30
test/Transforms/InstCombine/intrinsics.ll
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@@ -6,6 +6,8 @@ declare %overflow.result @llvm.uadd.with.overflow.i8(i8, i8)
declare %overflow.result @llvm.umul.with.overflow.i8(i8, i8)
declare double @llvm.powi.f64(double, i32) nounwind readonly
declare i32 @llvm.cttz.i32(i32) nounwind readnone
declare i32 @llvm.ctlz.i32(i32) nounwind readnone
declare i32 @llvm.ctpop.i32(i32) nounwind readnone
declare i8 @llvm.ctlz.i8(i8) nounwind readnone
define i8 @test1(i8 %A, i8 %B) {
@@ -99,8 +101,7 @@ entry:
; CHECK: volatile store double %V
}
define i32 @cttz(i32 %a)
{
define i32 @cttz(i32 %a) {
entry:
%or = or i32 %a, 8
%and = and i32 %or, -8
@@ -111,8 +112,7 @@ entry:
; CHECK-NEXT: ret i32 3
}
define i8 @ctlz(i8 %a)
{
define i8 @ctlz(i8 %a) {
entry:
%or = or i8 %a, 32
%and = and i8 %or, 63
@@ -122,3 +122,25 @@ entry:
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i8 2
}
define void @cmp.simplify(i32 %a, i32 %b, i1* %c) {
entry:
%lz = tail call i32 @llvm.ctlz.i32(i32 %a) nounwind readnone
%lz.cmp = icmp eq i32 %lz, 32
volatile store i1 %lz.cmp, i1* %c
%tz = tail call i32 @llvm.cttz.i32(i32 %a) nounwind readnone
%tz.cmp = icmp ne i32 %tz, 32
volatile store i1 %tz.cmp, i1* %c
%pop = tail call i32 @llvm.ctpop.i32(i32 %b) nounwind readnone
%pop.cmp = icmp eq i32 %pop, 0
volatile store i1 %pop.cmp, i1* %c
ret void
; CHECK: @cmp.simplify
; CHECK-NEXT: entry:
; CHECK-NEXT: %lz.cmp = icmp eq i32 %a, 0
; CHECK-NEXT: volatile store i1 %lz.cmp, i1* %c
; CHECK-NEXT: %tz.cmp = icmp ne i32 %a, 0
; CHECK-NEXT: volatile store i1 %tz.cmp, i1* %c
; CHECK-NEXT: %pop.cmp = icmp eq i32 %b, 0
; CHECK-NEXT: volatile store i1 %pop.cmp, i1* %c
}