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comparison test/CodeGen/AMDGPU/lds-oqap-crash.ll @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents
children 803732b1fca8
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84:f3e34b893a5f 95:afa8332a0e37
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:
13 define void @lds_crash(i32 addrspace(1)* %out, i32 addrspace(3)* %in, i32 %a, i32 %b, i32 %c) {
14 entry:
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 }