source: icGREP/icgrep-devel/llvm-3.8.0.src/test/CodeGen/AMDGPU/lds-oqap-crash.ll @ 5027

Last change on this file since 5027 was 5027, checked in by cameron, 3 years ago

Upgrade to llvm 3.8

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1; RUN: llc < %s -march=r600 -mcpu=redwood -verify-machineinstrs | FileCheck %s
2
3; The test is for a bug in R600EmitClauseMarkers.cpp where this pass
4; was searching for a use of the OQAP register in order to determine
5; if an LDS instruction could fit in the current clause, but never finding
6; one.  This created an infinite loop and hung the compiler.
7;
8; The LDS instruction should not have been defining OQAP in the first place,
9; because the LDS instructions are pseudo instructions and the OQAP
10; reads and writes are bundled together in the same instruction.
11
12; CHECK: {{^}}lds_crash:
13define void @lds_crash(i32 addrspace(1)* %out, i32 addrspace(3)* %in, i32 %a, i32 %b, i32 %c) {
14entry:
15  %0 = load i32, i32 addrspace(3)* %in
16  ; This block needs to be > 115 ISA instructions to hit the bug,
17  ; so we'll use udiv instructions.
18  %div0 = udiv i32 %0, %b
19  %div1 = udiv i32 %div0, %a
20  %div2 = udiv i32 %div1, 11
21  %div3 = udiv i32 %div2, %a
22  %div4 = udiv i32 %div3, %b
23  %div5 = udiv i32 %div4, %c
24  %div6 = udiv i32 %div5, %div0
25  %div7 = udiv i32 %div6, %div1
26  store i32 %div7, i32 addrspace(1)* %out
27  ret void
28}
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