| ; RUN: llc %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -o - |
| |
| ; When a i64 sub is expanded to subc + sube. |
| ; libcall #1 |
| ; \ |
| ; \ subc |
| ; \ / \ |
| ; \ / \ |
| ; \ / libcall #2 |
| ; sube |
| ; |
| ; If the libcalls are not serialized (i.e. both have chains which are dag |
| ; entry), legalizer can serialize them in arbitrary orders. If it's |
| ; unlucky, it can force libcall #2 before libcall #1 in the above case. |
| ; |
| ; subc |
| ; | |
| ; libcall #2 |
| ; | |
| ; libcall #1 |
| ; | |
| ; sube |
| ; |
| ; However since subc and sube are "glued" together, this ends up being a |
| ; cycle when the scheduler combine subc and sube as a single scheduling |
| ; unit. |
| ; |
| ; The right solution is to fix LegalizeType too chains the libcalls together. |
| ; However, LegalizeType is not processing nodes in order. The fix now is to |
| ; fix subc / sube (and addc / adde) to use physical register dependency instead. |
| ; rdar://10019576 |
| |
| define void @t() nounwind { |
| entry: |
| %tmp = load i64* undef, align 4 |
| %tmp5 = udiv i64 %tmp, 30 |
| %tmp13 = and i64 %tmp5, 64739244643450880 |
| %tmp16 = sub i64 0, %tmp13 |
| %tmp19 = and i64 %tmp16, 63 |
| %tmp20 = urem i64 %tmp19, 3 |
| %tmp22 = and i64 %tmp16, -272346829004752 |
| store i64 %tmp22, i64* undef, align 4 |
| store i64 %tmp20, i64* undef, align 4 |
| ret void |
| } |
