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Diffstat (limited to 'test/CodeGen/AArch64/bitfield-insert-0.ll')
| -rw-r--r-- | test/CodeGen/AArch64/bitfield-insert-0.ll | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/test/CodeGen/AArch64/bitfield-insert-0.ll b/test/CodeGen/AArch64/bitfield-insert-0.ll new file mode 100644 index 0000000000..1343ec7449 --- /dev/null +++ b/test/CodeGen/AArch64/bitfield-insert-0.ll @@ -0,0 +1,19 @@ +; RUN: llc -march=aarch64 -filetype=obj < %s | llvm-objdump -disassemble - | FileCheck %s + +; The encoding of lsb -> immr in the CGed bitfield instructions was wrong at one +; point, in the edge case where lsb = 0. Just make sure. + +define void @test_bfi0(i32* %existing, i32* %new) { +; CHECK: bfxil {{w[0-9]+}}, {{w[0-9]+}}, #0, #18 + + %oldval = load volatile i32* %existing + %oldval_keep = and i32 %oldval, 4294705152 ; 0xfffc_0000 + + %newval = load volatile i32* %new + %newval_masked = and i32 %newval, 262143 ; = 0x0003_ffff + + %combined = or i32 %newval_masked, %oldval_keep + store volatile i32 %combined, i32* %existing + + ret void +}
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