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1; RUN: llc < %s -mtriple=r600 -mcpu=redwood | FileCheck %s2 3; The test is for a bug in R600EmitClauseMarkers.cpp where this pass4; was searching for a use of the OQAP register in order to determine5; if an LDS instruction could fit in the current clause, but never finding6; 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 OQAP10; reads and writes are bundled together in the same instruction.11 12; CHECK: {{^}}lds_crash:13define amdgpu_kernel void @lds_crash(ptr addrspace(1) %out, ptr addrspace(3) %in, i32 %a, i32 %b, i32 %c) {14entry:15 %0 = load i32, ptr addrspace(3) %in16 ; This block needs to be > 115 ISA instructions to hit the bug,17 ; so we'll use udiv instructions.18 %div0 = udiv i32 %0, %b19 %div1 = udiv i32 %div0, %a20 %div2 = udiv i32 %div1, 1121 %div3 = udiv i32 %div2, %a22 %div4 = udiv i32 %div3, %b23 %div5 = udiv i32 %div4, %c24 %div6 = udiv i32 %div5, %div025 %div7 = udiv i32 %div6, %div126 store i32 %div7, ptr addrspace(1) %out27 ret void28}29