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clang-p2996/llvm/test/CodeGen/AMDGPU/divergence-driven-trunc-to-i1.ll
Venkata Ramanaiah Nalamothu 04fff547e2 [AMDGPU] Move call clobbered return address registers s[30:31] to callee saved range 
Currently the return address ABI registers s[30:31], which fall in the call
clobbered register range, are added as a live-in on the function entry to
preserve its value when we have calls so that it gets saved and restored
around the calls.

But the DWARF unwind information (CFI) needs to track where the return address
resides in a frame and the above approach makes it difficult to track the
return address when the CFI information is emitted during the frame lowering,
due to the involvment of understanding the control flow.

This patch moves the return address ABI registers s[30:31] into callee saved
registers range and stops adding live-in for return address registers, so that
the CFI machinery will know where the return address resides when CSR
save/restore happen during the frame lowering.

And doing the above poses an issue that now the return instruction uses undefined
register `sgpr30_sgpr31`. This is resolved by hiding the return address register
use by the return instruction through the `SI_RETURN` pseudo instruction, which
doesn't take any input operands, until the `SI_RETURN` pseudo gets lowered to the
`S_SETPC_B64_return` during the `expandPostRAPseudo()`.

As an added benefit, this patch simplifies overall return instruction handling.

Note: The AMDGPU CFI changes are there only in the downstream code and another
version of this patch will be posted for review for the downstream code.

Reviewed By: arsenm, ronlieb

Differential Revision: https://reviews.llvm.org/D114652
2022-03-09 12:18:02 +05:30

163 lines
11 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
; RUN: llc -march=amdgcn -stop-after=amdgpu-isel < %s | FileCheck -check-prefix=GCN %s
define amdgpu_kernel void @uniform_trunc_i16_to_i1(i1 addrspace(1)* %out, i16 %x, i1 %z) {
; GCN-LABEL: name: uniform_trunc_i16_to_i1
; GCN: bb.0 (%ir-block.0):
; GCN-NEXT: liveins: $sgpr0_sgpr1
; GCN-NEXT: {{ $}}
; GCN-NEXT: [[COPY:%[0-9]+]]:sgpr_64(p4) = COPY $sgpr0_sgpr1
; GCN-NEXT: [[S_LOAD_DWORDX2_IMM:%[0-9]+]]:sreg_64_xexec = S_LOAD_DWORDX2_IMM [[COPY]](p4), 9, 0 :: (dereferenceable invariant load (s64) from %ir.out.kernarg.offset.cast, align 4, addrspace 4)
; GCN-NEXT: [[S_LOAD_DWORD_IMM:%[0-9]+]]:sreg_32_xm0_xexec = S_LOAD_DWORD_IMM [[COPY]](p4), 11, 0 :: (dereferenceable invariant load (s32) from %ir.z.kernarg.offset.align.down.cast, addrspace 4)
; GCN-NEXT: [[COPY1:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX2_IMM]].sub1
; GCN-NEXT: [[COPY2:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX2_IMM]].sub0
; GCN-NEXT: [[S_MOV_B32_:%[0-9]+]]:sreg_32 = S_MOV_B32 61440
; GCN-NEXT: [[S_MOV_B32_1:%[0-9]+]]:sreg_32 = S_MOV_B32 -1
; GCN-NEXT: [[REG_SEQUENCE:%[0-9]+]]:sgpr_128 = REG_SEQUENCE killed [[COPY2]], %subreg.sub0, killed [[COPY1]], %subreg.sub1, killed [[S_MOV_B32_1]], %subreg.sub2, killed [[S_MOV_B32_]], %subreg.sub3
; GCN-NEXT: [[S_SEXT_I32_I16_:%[0-9]+]]:sreg_32 = S_SEXT_I32_I16 [[S_LOAD_DWORD_IMM]]
; GCN-NEXT: [[S_AND_B32_:%[0-9]+]]:sreg_32 = S_AND_B32 65536, [[S_LOAD_DWORD_IMM]], implicit-def dead $scc
; GCN-NEXT: S_CMP_LG_U32 killed [[S_AND_B32_]], 0, implicit-def $scc
; GCN-NEXT: [[COPY3:%[0-9]+]]:sreg_64 = COPY $scc
; GCN-NEXT: [[S_MOV_B32_2:%[0-9]+]]:sreg_32 = S_MOV_B32 0
; GCN-NEXT: S_CMP_LT_I32 killed [[S_SEXT_I32_I16_]], killed [[S_MOV_B32_2]], implicit-def $scc
; GCN-NEXT: [[COPY4:%[0-9]+]]:sreg_64 = COPY $scc
; GCN-NEXT: [[S_OR_B64_:%[0-9]+]]:sreg_64_xexec = S_OR_B64 killed [[COPY4]], killed [[COPY3]], implicit-def dead $scc
; GCN-NEXT: [[V_CNDMASK_B32_e64_:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed [[S_OR_B64_]], implicit $exec
; GCN-NEXT: BUFFER_STORE_BYTE_OFFSET killed [[V_CNDMASK_B32_e64_]], killed [[REG_SEQUENCE]], 0, 0, 0, 0, 0, implicit $exec :: (store (s8) into %ir.out.load, addrspace 1)
; GCN-NEXT: S_ENDPGM 0
%setcc = icmp slt i16 %x, 0
%select = select i1 %setcc, i1 true, i1 %z
store i1 %select, i1 addrspace(1)* %out
ret void
}
define i1 @divergent_trunc_i16_to_i1(i1 addrspace(1)* %out, i16 %x, i1 %z) {
; GCN-LABEL: name: divergent_trunc_i16_to_i1
; GCN: bb.0 (%ir-block.0):
; GCN-NEXT: liveins: $vgpr2, $vgpr3
; GCN-NEXT: {{ $}}
; GCN-NEXT: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr3
; GCN-NEXT: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr2
; GCN-NEXT: [[V_AND_B32_e64_:%[0-9]+]]:vgpr_32 = V_AND_B32_e64 1, [[COPY]], implicit $exec
; GCN-NEXT: [[V_CMP_EQ_U32_e64_:%[0-9]+]]:sreg_64 = V_CMP_EQ_U32_e64 killed [[V_AND_B32_e64_]], 1, implicit $exec
; GCN-NEXT: [[V_BFE_I32_e64_:%[0-9]+]]:vgpr_32 = V_BFE_I32_e64 [[COPY1]], 0, 16, implicit $exec
; GCN-NEXT: [[S_MOV_B32_:%[0-9]+]]:sreg_32 = S_MOV_B32 0
; GCN-NEXT: [[V_CMP_LT_I32_e64_:%[0-9]+]]:sreg_64 = V_CMP_LT_I32_e64 killed [[V_BFE_I32_e64_]], killed [[S_MOV_B32_]], implicit $exec
; GCN-NEXT: [[S_OR_B64_:%[0-9]+]]:sreg_64_xexec = S_OR_B64 killed [[V_CMP_LT_I32_e64_]], killed [[V_CMP_EQ_U32_e64_]], implicit-def dead $scc
; GCN-NEXT: [[V_CNDMASK_B32_e64_:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed [[S_OR_B64_]], implicit $exec
; GCN-NEXT: $vgpr0 = COPY [[V_CNDMASK_B32_e64_]]
; GCN-NEXT: SI_RETURN implicit $vgpr0
%setcc = icmp slt i16 %x, 0
%select = select i1 %setcc, i1 true, i1 %z
ret i1 %select
}
define amdgpu_kernel void @uniform_trunc_i32_to_i1(i1 addrspace(1)* %out, i32 %x, i1 %z) {
; GCN-LABEL: name: uniform_trunc_i32_to_i1
; GCN: bb.0 (%ir-block.0):
; GCN-NEXT: liveins: $sgpr0_sgpr1
; GCN-NEXT: {{ $}}
; GCN-NEXT: [[COPY:%[0-9]+]]:sgpr_64(p4) = COPY $sgpr0_sgpr1
; GCN-NEXT: [[S_LOAD_DWORDX2_IMM:%[0-9]+]]:sreg_64_xexec = S_LOAD_DWORDX2_IMM [[COPY]](p4), 9, 0 :: (dereferenceable invariant load (s64) from %ir.out.kernarg.offset.cast, align 4, addrspace 4)
; GCN-NEXT: [[S_LOAD_DWORDX2_IMM1:%[0-9]+]]:sreg_64_xexec = S_LOAD_DWORDX2_IMM [[COPY]](p4), 11, 0 :: (dereferenceable invariant load (s64) from %ir.1, align 4, addrspace 4)
; GCN-NEXT: [[COPY1:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX2_IMM]].sub1
; GCN-NEXT: [[COPY2:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX2_IMM]].sub0
; GCN-NEXT: [[S_MOV_B32_:%[0-9]+]]:sreg_32 = S_MOV_B32 61440
; GCN-NEXT: [[S_MOV_B32_1:%[0-9]+]]:sreg_32 = S_MOV_B32 -1
; GCN-NEXT: [[REG_SEQUENCE:%[0-9]+]]:sgpr_128 = REG_SEQUENCE killed [[COPY2]], %subreg.sub0, killed [[COPY1]], %subreg.sub1, killed [[S_MOV_B32_1]], %subreg.sub2, killed [[S_MOV_B32_]], %subreg.sub3
; GCN-NEXT: [[COPY3:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX2_IMM1]].sub0
; GCN-NEXT: [[COPY4:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX2_IMM1]].sub1
; GCN-NEXT: [[S_AND_B32_:%[0-9]+]]:sreg_32 = S_AND_B32 1, killed [[COPY4]], implicit-def dead $scc
; GCN-NEXT: S_CMP_EQ_U32 killed [[S_AND_B32_]], 1, implicit-def $scc
; GCN-NEXT: [[COPY5:%[0-9]+]]:sreg_64 = COPY $scc
; GCN-NEXT: [[S_MOV_B32_2:%[0-9]+]]:sreg_32 = S_MOV_B32 0
; GCN-NEXT: S_CMP_LT_I32 killed [[COPY3]], killed [[S_MOV_B32_2]], implicit-def $scc
; GCN-NEXT: [[COPY6:%[0-9]+]]:sreg_64 = COPY $scc
; GCN-NEXT: [[S_OR_B64_:%[0-9]+]]:sreg_64_xexec = S_OR_B64 killed [[COPY6]], killed [[COPY5]], implicit-def dead $scc
; GCN-NEXT: [[V_CNDMASK_B32_e64_:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed [[S_OR_B64_]], implicit $exec
; GCN-NEXT: BUFFER_STORE_BYTE_OFFSET killed [[V_CNDMASK_B32_e64_]], killed [[REG_SEQUENCE]], 0, 0, 0, 0, 0, implicit $exec :: (store (s8) into %ir.out.load, addrspace 1)
; GCN-NEXT: S_ENDPGM 0
%setcc = icmp slt i32 %x, 0
%select = select i1 %setcc, i1 true, i1 %z
store i1 %select, i1 addrspace(1)* %out
ret void
}
define i1 @divergent_trunc_i32_to_i1(i1 addrspace(1)* %out, i32 %x, i1 %z) {
; GCN-LABEL: name: divergent_trunc_i32_to_i1
; GCN: bb.0 (%ir-block.0):
; GCN-NEXT: liveins: $vgpr2, $vgpr3
; GCN-NEXT: {{ $}}
; GCN-NEXT: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr3
; GCN-NEXT: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr2
; GCN-NEXT: [[V_AND_B32_e64_:%[0-9]+]]:vgpr_32 = V_AND_B32_e64 1, [[COPY]], implicit $exec
; GCN-NEXT: [[V_CMP_EQ_U32_e64_:%[0-9]+]]:sreg_64 = V_CMP_EQ_U32_e64 killed [[V_AND_B32_e64_]], 1, implicit $exec
; GCN-NEXT: [[S_MOV_B32_:%[0-9]+]]:sreg_32 = S_MOV_B32 0
; GCN-NEXT: [[V_CMP_LT_I32_e64_:%[0-9]+]]:sreg_64 = V_CMP_LT_I32_e64 [[COPY1]], killed [[S_MOV_B32_]], implicit $exec
; GCN-NEXT: [[S_OR_B64_:%[0-9]+]]:sreg_64_xexec = S_OR_B64 killed [[V_CMP_LT_I32_e64_]], killed [[V_CMP_EQ_U32_e64_]], implicit-def dead $scc
; GCN-NEXT: [[V_CNDMASK_B32_e64_:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed [[S_OR_B64_]], implicit $exec
; GCN-NEXT: $vgpr0 = COPY [[V_CNDMASK_B32_e64_]]
; GCN-NEXT: SI_RETURN implicit $vgpr0
%setcc = icmp slt i32 %x, 0
%select = select i1 %setcc, i1 true, i1 %z
ret i1 %select
}
define amdgpu_kernel void @uniform_trunc_i64_to_i1(i1 addrspace(1)* %out, i64 %x, i1 %z) {
; GCN-LABEL: name: uniform_trunc_i64_to_i1
; GCN: bb.0 (%ir-block.0):
; GCN-NEXT: liveins: $sgpr0_sgpr1
; GCN-NEXT: {{ $}}
; GCN-NEXT: [[COPY:%[0-9]+]]:sgpr_64(p4) = COPY $sgpr0_sgpr1
; GCN-NEXT: [[S_LOAD_DWORDX4_IMM:%[0-9]+]]:sgpr_128 = S_LOAD_DWORDX4_IMM [[COPY]](p4), 9, 0 :: (dereferenceable invariant load (s128) from %ir.1, align 4, addrspace 4)
; GCN-NEXT: [[S_LOAD_DWORD_IMM:%[0-9]+]]:sreg_32_xm0_xexec = S_LOAD_DWORD_IMM [[COPY]](p4), 13, 0 :: (dereferenceable invariant load (s32) from %ir.z.kernarg.offset.align.down.cast, addrspace 4)
; GCN-NEXT: [[COPY1:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX4_IMM]].sub1
; GCN-NEXT: [[COPY2:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX4_IMM]].sub0
; GCN-NEXT: [[REG_SEQUENCE:%[0-9]+]]:sreg_64 = REG_SEQUENCE killed [[COPY2]], %subreg.sub0, killed [[COPY1]], %subreg.sub1
; GCN-NEXT: [[COPY3:%[0-9]+]]:sreg_32 = COPY [[REG_SEQUENCE]].sub1
; GCN-NEXT: [[COPY4:%[0-9]+]]:sreg_32 = COPY [[REG_SEQUENCE]].sub0
; GCN-NEXT: [[S_MOV_B32_:%[0-9]+]]:sreg_32 = S_MOV_B32 61440
; GCN-NEXT: [[S_MOV_B32_1:%[0-9]+]]:sreg_32 = S_MOV_B32 -1
; GCN-NEXT: [[REG_SEQUENCE1:%[0-9]+]]:sgpr_128 = REG_SEQUENCE killed [[COPY4]], %subreg.sub0, killed [[COPY3]], %subreg.sub1, killed [[S_MOV_B32_1]], %subreg.sub2, killed [[S_MOV_B32_]], %subreg.sub3
; GCN-NEXT: [[COPY5:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX4_IMM]].sub3
; GCN-NEXT: [[COPY6:%[0-9]+]]:sreg_32 = COPY [[S_LOAD_DWORDX4_IMM]].sub2
; GCN-NEXT: [[REG_SEQUENCE2:%[0-9]+]]:sreg_64 = REG_SEQUENCE killed [[COPY6]], %subreg.sub0, killed [[COPY5]], %subreg.sub1
; GCN-NEXT: [[S_AND_B32_:%[0-9]+]]:sreg_32 = S_AND_B32 1, killed [[S_LOAD_DWORD_IMM]], implicit-def dead $scc
; GCN-NEXT: S_CMP_EQ_U32 killed [[S_AND_B32_]], 1, implicit-def $scc
; GCN-NEXT: [[COPY7:%[0-9]+]]:sreg_64 = COPY $scc
; GCN-NEXT: [[S_MOV_B64_:%[0-9]+]]:sreg_64 = S_MOV_B64 0
; GCN-NEXT: [[COPY8:%[0-9]+]]:vreg_64 = COPY killed [[S_MOV_B64_]]
; GCN-NEXT: [[V_CMP_LT_I64_e64_:%[0-9]+]]:sreg_64 = V_CMP_LT_I64_e64 killed [[REG_SEQUENCE2]], [[COPY8]], implicit $exec
; GCN-NEXT: [[S_OR_B64_:%[0-9]+]]:sreg_64_xexec = S_OR_B64 killed [[V_CMP_LT_I64_e64_]], killed [[COPY7]], implicit-def dead $scc
; GCN-NEXT: [[V_CNDMASK_B32_e64_:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed [[S_OR_B64_]], implicit $exec
; GCN-NEXT: BUFFER_STORE_BYTE_OFFSET killed [[V_CNDMASK_B32_e64_]], killed [[REG_SEQUENCE1]], 0, 0, 0, 0, 0, implicit $exec :: (store (s8) into %ir.3, addrspace 1)
; GCN-NEXT: S_ENDPGM 0
%setcc = icmp slt i64 %x, 0
%select = select i1 %setcc, i1 true, i1 %z
store i1 %select, i1 addrspace(1)* %out
ret void
}
define i1 @divergent_trunc_i64_to_i1(i1 addrspace(1)* %out, i64 %x, i1 %z) {
; GCN-LABEL: name: divergent_trunc_i64_to_i1
; GCN: bb.0 (%ir-block.0):
; GCN-NEXT: liveins: $vgpr2, $vgpr3, $vgpr4
; GCN-NEXT: {{ $}}
; GCN-NEXT: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr4
; GCN-NEXT: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr3
; GCN-NEXT: [[COPY2:%[0-9]+]]:vgpr_32 = COPY $vgpr2
; GCN-NEXT: [[REG_SEQUENCE:%[0-9]+]]:sreg_64 = REG_SEQUENCE [[COPY2]], %subreg.sub0, [[COPY1]], %subreg.sub1
; GCN-NEXT: [[V_AND_B32_e64_:%[0-9]+]]:vgpr_32 = V_AND_B32_e64 1, [[COPY]], implicit $exec
; GCN-NEXT: [[V_CMP_EQ_U32_e64_:%[0-9]+]]:sreg_64 = V_CMP_EQ_U32_e64 killed [[V_AND_B32_e64_]], 1, implicit $exec
; GCN-NEXT: [[S_MOV_B64_:%[0-9]+]]:sreg_64 = S_MOV_B64 0
; GCN-NEXT: [[COPY3:%[0-9]+]]:vreg_64 = COPY killed [[S_MOV_B64_]]
; GCN-NEXT: [[V_CMP_LT_I64_e64_:%[0-9]+]]:sreg_64 = V_CMP_LT_I64_e64 killed [[REG_SEQUENCE]], [[COPY3]], implicit $exec
; GCN-NEXT: [[S_OR_B64_:%[0-9]+]]:sreg_64_xexec = S_OR_B64 killed [[V_CMP_LT_I64_e64_]], killed [[V_CMP_EQ_U32_e64_]], implicit-def dead $scc
; GCN-NEXT: [[V_CNDMASK_B32_e64_:%[0-9]+]]:vgpr_32 = V_CNDMASK_B32_e64 0, 0, 0, 1, killed [[S_OR_B64_]], implicit $exec
; GCN-NEXT: $vgpr0 = COPY [[V_CNDMASK_B32_e64_]]
; GCN-NEXT: SI_RETURN implicit $vgpr0
%setcc = icmp slt i64 %x, 0
%select = select i1 %setcc, i1 true, i1 %z
ret i1 %select
}
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