105 lines
3.9 KiB
LLVM
105 lines
3.9 KiB
LLVM
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; RUN: opt -S -demanded-bits -analyze -enable-new-pm=0 < %s | FileCheck %s
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; RUN: opt -S -disable-output -passes="print<demanded-bits>" < %s 2>&1 | FileCheck %s
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; CHECK-DAG: DemandedBits: 0xff000000 for %1 = or i32 %x, 1
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; CHECK-DAG: DemandedBits: 0xff for %2 = call i32 @llvm.bitreverse.i32(i32 %1)
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; CHECK-DAG: DemandedBits: 0xff for %3 = trunc i32 %2 to i8
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define i8 @test_bswap(i32 %x) {
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%1 = or i32 %x, 1
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%2 = call i32 @llvm.bswap.i32(i32 %1)
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%3 = trunc i32 %2 to i8
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ret i8 %3
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}
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declare i32 @llvm.bswap.i32(i32)
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; CHECK-DAG: DemandedBits: 0xff000000 for %1 = or i32 %x, 1
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; CHECK-DAG: DemandedBits: 0xff for %2 = call i32 @llvm.bswap.i32(i32 %1)
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; CHECK-DAG: DemandedBits: 0xff for %3 = trunc i32 %2 to i8
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define i8 @test_bitreverse(i32 %x) {
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%1 = or i32 %x, 1
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%2 = call i32 @llvm.bitreverse.i32(i32 %1)
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%3 = trunc i32 %2 to i8
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ret i8 %3
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}
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declare i32 @llvm.bitreverse.i32(i32)
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; Funnel shifts
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declare i32 @llvm.fshl.i32(i32, i32, i32)
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declare i33 @llvm.fshr.i33(i33, i33, i33)
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; CHECK-DAG: DemandedBits: 0xff for %x2 = or i32 %x, 1
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; CHECK-DAG: DemandedBits: 0xff000000 for %y2 = or i32 %y, 1
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; CHECK-DAG: DemandedBits: 0xffff for %z = call i32 @llvm.fshl.i32(i32 %x2, i32 %y2, i32 8)
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; CHECK-DAG: DemandedBits: 0xffffffff for %r = and i32 %z, 65535
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define i32 @test_fshl(i32 %x, i32 %y) {
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%x2 = or i32 %x, 1
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%y2 = or i32 %y, 1
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%z = call i32 @llvm.fshl.i32(i32 %x2, i32 %y2, i32 8)
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%r = and i32 %z, 65535
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ret i32 %r
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}
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; CHECK-DAG: DemandedBits: 0xff for %x2 = or i33 %x, 1
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; CHECK-DAG: DemandedBits: 0x1fe000000 for %y2 = or i33 %y, 1
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; CHECK-DAG: DemandedBits: 0xffff for %z = call i33 @llvm.fshr.i33(i33 %x2, i33 %y2, i33 25)
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; CHECK-DAG: DemandedBits: 0x1ffffffff for %r = and i33 %z, 65535
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define i33 @test_fshr(i33 %x, i33 %y) {
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%x2 = or i33 %x, 1
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%y2 = or i33 %y, 1
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%z = call i33 @llvm.fshr.i33(i33 %x2, i33 %y2, i33 25)
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%r = and i33 %z, 65535
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ret i33 %r
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}
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; CHECK-DAG: DemandedBits: 0xffff for %x2 = or i32 %x, 1
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; CHECK-DAG: DemandedBits: 0x0 for %y2 = or i32 %y, 1
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; CHECK-DAG: DemandedBits: 0xffff for %z = call i32 @llvm.fshl.i32(i32 %x2, i32 %y2, i32 0)
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; CHECK-DAG: DemandedBits: 0xffffffff for %r = and i32 %z, 65535
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define i32 @test_fshl_zero_shift(i32 %x, i32 %y) {
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%x2 = or i32 %x, 1
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%y2 = or i32 %y, 1
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%z = call i32 @llvm.fshl.i32(i32 %x2, i32 %y2, i32 0)
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%r = and i32 %z, 65535
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ret i32 %r
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}
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; CHECK-DAG: DemandedBits: 0x0 for %x2 = or i33 %x, 1
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; CHECK-DAG: DemandedBits: 0xffff for %y2 = or i33 %y, 1
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; CHECK-DAG: DemandedBits: 0xffff for %z = call i33 @llvm.fshr.i33(i33 %x2, i33 %y2, i33 33)
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; CHECK-DAG: DemandedBits: 0x1ffffffff for %r = and i33 %z, 65535
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define i33 @test_fshr_full_shift(i33 %x, i33 %y) {
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%x2 = or i33 %x, 1
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%y2 = or i33 %y, 1
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%z = call i33 @llvm.fshr.i33(i33 %x2, i33 %y2, i33 33)
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%r = and i33 %z, 65535
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ret i33 %r
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}
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; CHECK-DAG: DemandedBits: 0xffffffff for %x2 = or i32 %x, 1
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; CHECK-DAG: DemandedBits: 0xffffffff for %y2 = or i32 %y, 1
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; CHECK-DAG: DemandedBits: 0x1f for %z2 = or i32 %z, 1
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; CHECK-DAG: DemandedBits: 0xffff for %f = call i32 @llvm.fshl.i32(i32 %x2, i32 %y2, i32 %z2)
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; CHECK-DAG: DemandedBits: 0xffffffff for %r = and i32 %f, 65535
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define i32 @test_fshl_pow2_bitwidth(i32 %x, i32 %y, i32 %z) {
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%x2 = or i32 %x, 1
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%y2 = or i32 %y, 1
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%z2 = or i32 %z, 1
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%f = call i32 @llvm.fshl.i32(i32 %x2, i32 %y2, i32 %z2)
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%r = and i32 %f, 65535
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ret i32 %r
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}
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; CHECK-DAG: DemandedBits: 0x1ffffffff for %x2 = or i33 %x, 1
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; CHECK-DAG: DemandedBits: 0x1ffffffff for %y2 = or i33 %y, 1
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; CHECK-DAG: DemandedBits: 0x1ffffffff for %z2 = or i33 %z, 1
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; CHECK-DAG: DemandedBits: 0xffff for %f = call i33 @llvm.fshr.i33(i33 %x2, i33 %y2, i33 %z2)
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; CHECK-DAG: DemandedBits: 0x1ffffffff for %r = and i33 %f, 65535
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define i33 @test_fshr_non_pow2_bitwidth(i33 %x, i33 %y, i33 %z) {
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%x2 = or i33 %x, 1
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%y2 = or i33 %y, 1
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%z2 = or i33 %z, 1
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%f = call i33 @llvm.fshr.i33(i33 %x2, i33 %y2, i33 %z2)
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%r = and i33 %f, 65535
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ret i33 %r
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}
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