forked from OSchip/llvm-project
46 lines
1.1 KiB
LLVM
46 lines
1.1 KiB
LLVM
; RUN: opt < %s -S -instcombine | FileCheck %s
|
|
|
|
declare i32 @llvm.ctpop.i32(i32)
|
|
declare i8 @llvm.ctpop.i8(i8)
|
|
declare void @llvm.assume(i1)
|
|
|
|
define i1 @test1(i32 %arg) {
|
|
; CHECK: @test1
|
|
; CHECK: ret i1 false
|
|
%and = and i32 %arg, 15
|
|
%cnt = call i32 @llvm.ctpop.i32(i32 %and)
|
|
%res = icmp eq i32 %cnt, 9
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @test2(i32 %arg) {
|
|
; CHECK: @test2
|
|
; CHECK: ret i1 false
|
|
%and = and i32 %arg, 1
|
|
%cnt = call i32 @llvm.ctpop.i32(i32 %and)
|
|
%res = icmp eq i32 %cnt, 2
|
|
ret i1 %res
|
|
}
|
|
|
|
define i1 @test3(i32 %arg) {
|
|
; CHECK: @test3
|
|
; CHECK: ret i1 false
|
|
;; Use an assume to make all the bits known without triggering constant
|
|
;; folding. This is trying to hit a corner case where we have to avoid
|
|
;; taking the log of 0.
|
|
%assume = icmp eq i32 %arg, 0
|
|
call void @llvm.assume(i1 %assume)
|
|
%cnt = call i32 @llvm.ctpop.i32(i32 %arg)
|
|
%res = icmp eq i32 %cnt, 2
|
|
ret i1 %res
|
|
}
|
|
|
|
; Negative test for when we know nothing
|
|
define i1 @test4(i8 %arg) {
|
|
; CHECK: @test4
|
|
; CHECK: ret i1 %res
|
|
%cnt = call i8 @llvm.ctpop.i8(i8 %arg)
|
|
%res = icmp eq i8 %cnt, 2
|
|
ret i1 %res
|
|
}
|