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