20 lines
665 B
LLVM
20 lines
665 B
LLVM
; RUN: llc -mtriple=aarch64-linux-gnu -filetype=obj -o - %s | llvm-objdump -disassemble - | FileCheck %s
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; The encoding of lsb -> immr in the CGed bitfield instructions was wrong at one
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; point, in the edge case where lsb = 0. Just make sure.
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define void @test_bfi0(i32* %existing, i32* %new) {
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; CHECK: bfxil {{w[0-9]+}}, {{w[0-9]+}}, #0, #18
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%oldval = load volatile i32, i32* %existing
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%oldval_keep = and i32 %oldval, 4294705152 ; 0xfffc_0000
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%newval = load volatile i32, i32* %new
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%newval_masked = and i32 %newval, 262143 ; = 0x0003_ffff
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%combined = or i32 %newval_masked, %oldval_keep
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store volatile i32 %combined, i32* %existing
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ret void
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}
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