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