derek.holloway
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48 lines
1.1 KiB
LLVM
48 lines
1.1 KiB
LLVM
; RUN: opt < %s -S -passes=instcombine | FileCheck %s
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; Note: This is testing functionality in computeKnownBits. I'd have rather
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; used instsimplify, but the bit test folding is apparently only in instcombine.
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declare i16 @llvm.bswap.i16(i16)
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declare i32 @llvm.bswap.i32(i32)
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define i1 @test1(i16 %arg) {
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; CHECK-LABEL: @test1
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; CHECK: ret i1 true
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%a = or i16 %arg, 511
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%b = call i16 @llvm.bswap.i16(i16 %a)
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%and = and i16 %b, 256
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%res = icmp eq i16 %and, 256
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ret i1 %res
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}
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define i1 @test2(i16 %arg) {
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; CHECK-LABEL: @test2
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; CHECK: ret i1 true
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%a = or i16 %arg, 1
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%b = call i16 @llvm.bswap.i16(i16 %a)
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%and = and i16 %b, 256
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%res = icmp eq i16 %and, 256
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ret i1 %res
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}
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define i1 @test3(i16 %arg) {
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; CHECK-LABEL: @test3
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; CHECK: ret i1 true
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%a = or i16 %arg, 256
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%b = call i16 @llvm.bswap.i16(i16 %a)
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%and = and i16 %b, 1
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%res = icmp eq i16 %and, 1
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ret i1 %res
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}
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define i1 @test4(i32 %arg) {
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; CHECK-LABEL: @test4
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; CHECK: ret i1 true
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%a = or i32 %arg, 2147483647 ; i32_MAX
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%b = call i32 @llvm.bswap.i32(i32 %a)
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%and = and i32 %b, 127
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%res = icmp eq i32 %and, 127
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ret i1 %res
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}
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