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