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27 lines
746 B
LLVM
27 lines
746 B
LLVM
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; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s
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; CHECK: @bfe_def
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; CHECK: BFE_UINT
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define void @bfe_def(i32 addrspace(1)* %out, i32 %x) {
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entry:
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%0 = lshr i32 %x, 5
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%1 = and i32 %0, 15 ; 0xf
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store i32 %1, i32 addrspace(1)* %out
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ret void
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}
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; This program could be implemented using a BFE_UINT instruction, however
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; since the lshr constant + number of bits in the mask is >= 32, it can also be
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; implmented with a LSHR instruction, which is better, because LSHR has less
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; operands and requires less constants.
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; CHECK: @bfe_shift
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; CHECK-NOT: BFE_UINT
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define void @bfe_shift(i32 addrspace(1)* %out, i32 %x) {
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entry:
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%0 = lshr i32 %x, 16
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%1 = and i32 %0, 65535 ; 0xffff
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store i32 %1, i32 addrspace(1)* %out
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ret void
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}
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