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e9014468b6
Due to the SGPR init bug, every program claims to use the same number of SGPRs anyway, so there's no point in trying to shift those registers down from their initial spot of reservation. Add a test that uses VGPR spilling and blocks most SGPRs from being used for the scratch resource register. Previously, this would run into an assertion. Differential Revision: http://reviews.llvm.org/D15724 llvm-svn: 256870
25 lines
1.1 KiB
LLVM
25 lines
1.1 KiB
LLVM
; RUN: llc -march=amdgcn -mcpu=tonga < %s | FileCheck --check-prefix=TONGA %s
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; On Tonga and Iceland, limited SGPR availability means care must be taken to
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; allocate scratch registers correctly. Check that this test compiles without
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; error.
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; TONGA-LABEL: test
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define void @test(<256 x i32> addrspace(1)* %out, <256 x i32> addrspace(1)* %in) {
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entry:
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%tid = call i32 @llvm.SI.tid() nounwind readnone
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%aptr = getelementptr <256 x i32>, <256 x i32> addrspace(1)* %in, i32 %tid
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%a = load <256 x i32>, <256 x i32> addrspace(1)* %aptr
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call void asm sideeffect "", "~{memory}" ()
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%outptr = getelementptr <256 x i32>, <256 x i32> addrspace(1)* %in, i32 %tid
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store <256 x i32> %a, <256 x i32> addrspace(1)* %outptr
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; mark 128-bit SGPR registers as used so they are unavailable for the
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; scratch resource descriptor
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call void asm sideeffect "", "~{SGPR4},~{SGPR8},~{SGPR12},~{SGPR16},~{SGPR20},~{SGPR24},~{SGPR28}" ()
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call void asm sideeffect "", "~{SGPR32},~{SGPR36},~{SGPR40},~{SGPR44},~{SGPR48},~{SGPR52},~{SGPR56}" ()
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call void asm sideeffect "", "~{SGPR60},~{SGPR64},~{SGPR68}" ()
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ret void
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}
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declare i32 @llvm.SI.tid() nounwind readnone
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