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AMDGPU: Reduce number of copies emitted

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Instead of always inserting a copy in case
the super register is itself a subregister,
only extract to the super reg class if this is
actually the case.

This shouldn't really change codegen, but
makes looking at the output of SIFixSGPRCopies
easier to read.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248467 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2015-09-24 07:16:37 +00:00
parent 71c9e7e6ce
commit bb9c0afde5
4 changed files with 19 additions and 21 deletions
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14
lib/Target/AMDGPU/SIInstrInfo.cpp
View File

@ -1556,17 +1556,21 @@ unsigned SIInstrInfo::buildExtractSubReg(MachineBasicBlock::iterator MI,
unsigned SubIdx,
const TargetRegisterClass *SubRC)
const {
assert(SuperReg.isReg());
unsigned NewSuperReg = MRI.createVirtualRegister(SuperRC);
MachineBasicBlock *MBB = MI->getParent();
DebugLoc DL = MI->getDebugLoc();
unsigned SubReg = MRI.createVirtualRegister(SubRC);
if (SuperReg.getSubReg() == AMDGPU::NoSubRegister) {
BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), SubReg)
.addReg(SuperReg.getReg(), 0, SubIdx);
return SubReg;
}
// Just in case the super register is itself a sub-register, copy it to a new
// value so we don't need to worry about merging its subreg index with the
// SubIdx passed to this function. The register coalescer should be able to
// eliminate this extra copy.
MachineBasicBlock *MBB = MI->getParent();
DebugLoc DL = MI->getDebugLoc();
unsigned NewSuperReg = MRI.createVirtualRegister(SuperRC);
BuildMI(*MBB, MI, DL, get(TargetOpcode::COPY), NewSuperReg)
.addReg(SuperReg.getReg(), 0, SuperReg.getSubReg());

3
test/CodeGen/AMDGPU/and.ll
View File

@ -147,9 +147,10 @@ endif:
ret void
}
; FIXME: and 0 should be replaced witht copy
; FUNC-LABEL: {{^}}v_and_constant_i64:
; SI: v_and_b32_e32 {{v[0-9]+}}, {{s[0-9]+}}, {{v[0-9]+}}
; SI: v_and_b32_e32 {{v[0-9]+}}, {{s[0-9]+}}, {{v[0-9]+}}
; SI: v_and_b32_e32 {{v[0-9]+}}, 0, {{v[0-9]+}}
define void @v_and_constant_i64(i64 addrspace(1)* %out, i64 addrspace(1)* %aptr) {
%a = load i64, i64 addrspace(1)* %aptr, align 8
%and = and i64 %a, 1234567

5
test/CodeGen/AMDGPU/ctpop64.ll
View File

@ -36,15 +36,14 @@ define void @v_ctpop_i64(i32 addrspace(1)* noalias %out, i64 addrspace(1)* noali
ret void
}
; FIXME: We shouldn't emit the v_mov_b32 0
; FIXME: or 0 should be replaxed with copy
; FUNC-LABEL: {{^}}v_ctpop_i64_user:
; GCN: buffer_load_dwordx2 v{{\[}}[[LOVAL:[0-9]+]]:[[HIVAL:[0-9]+]]{{\]}},
; GCN: v_bcnt_u32_b32_e64 [[MIDRESULT:v[0-9]+]], v[[LOVAL]], 0
; SI-NEXT: v_bcnt_u32_b32_e32 [[RESULT:v[0-9]+]], v[[HIVAL]], [[MIDRESULT]]
; VI-NEXT: v_bcnt_u32_b32_e64 [[RESULT:v[0-9]+]], v[[HIVAL]], [[MIDRESULT]]
; GCN-DAG: v_mov_b32_e32 v[[ZERO:[0-9]+]], 0{{$}}
; GCN-DAG: v_or_b32_e32 v[[RESULT_LO:[0-9]+]], s{{[0-9]+}}, [[RESULT]]
; GCN-DAG: v_or_b32_e32 v[[RESULT_HI:[0-9]+]], s{{[0-9]+}}, v[[ZERO]]
; GCN-DAG: v_or_b32_e64 v[[RESULT_HI:[0-9]+]], 0, s{{[0-9]+}}
; GCN: buffer_store_dwordx2 v{{\[}}[[RESULT_LO]]:[[RESULT_HI]]{{\]}}
; GCN: s_endpgm
define void @v_ctpop_i64_user(i64 addrspace(1)* noalias %out, i64 addrspace(1)* noalias %in, i64 %s.val) nounwind {

18
test/CodeGen/AMDGPU/s_movk_i32.ll
View File

@ -3,10 +3,9 @@
; SI-LABEL: {{^}}s_movk_i32_k0:
; SI-DAG: s_mov_b32 [[LO_S_IMM:s[0-9]+]], 0xffff{{$}}
; SI-DAG: s_mov_b32 [[HI_S_IMM:s[0-9]+]], 1{{$}}
; SI-DAG: buffer_load_dwordx2 v{{\[}}[[LO_VREG:[0-9]+]]:[[HI_VREG:[0-9]+]]{{\]}},
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[LO_S_IMM]], v[[LO_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[HI_S_IMM]], v[[HI_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, 1, v[[HI_VREG]]
; SI: s_endpgm
define void @s_movk_i32_k0(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 addrspace(1)* %b) {
%loada = load i64, i64 addrspace(1)* %a, align 4
@ -17,10 +16,9 @@ define void @s_movk_i32_k0(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 add
; SI-LABEL: {{^}}s_movk_i32_k1:
; SI-DAG: s_movk_i32 [[LO_S_IMM:s[0-9]+]], 0x7fff{{$}}
; SI-DAG: s_mov_b32 [[HI_S_IMM:s[0-9]+]], 1{{$}}
; SI-DAG: buffer_load_dwordx2 v{{\[}}[[LO_VREG:[0-9]+]]:[[HI_VREG:[0-9]+]]{{\]}},
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[LO_S_IMM]], v[[LO_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[HI_S_IMM]], v[[HI_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, 1, v[[HI_VREG]]
; SI: s_endpgm
define void @s_movk_i32_k1(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 addrspace(1)* %b) {
%loada = load i64, i64 addrspace(1)* %a, align 4
@ -31,10 +29,9 @@ define void @s_movk_i32_k1(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 add
; SI-LABEL: {{^}}s_movk_i32_k2:
; SI-DAG: s_movk_i32 [[LO_S_IMM:s[0-9]+]], 0x7fff{{$}}
; SI-DAG: s_mov_b32 [[HI_S_IMM:s[0-9]+]], 64{{$}}
; SI-DAG: buffer_load_dwordx2 v{{\[}}[[LO_VREG:[0-9]+]]:[[HI_VREG:[0-9]+]]{{\]}},
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[LO_S_IMM]], v[[LO_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[HI_S_IMM]], v[[HI_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, 64, v[[HI_VREG]]
; SI: s_endpgm
define void @s_movk_i32_k2(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 addrspace(1)* %b) {
%loada = load i64, i64 addrspace(1)* %a, align 4
@ -45,10 +42,9 @@ define void @s_movk_i32_k2(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 add
; SI-LABEL: {{^}}s_movk_i32_k3:
; SI-DAG: s_mov_b32 [[LO_S_IMM:s[0-9]+]], 0x8000{{$}}
; SI-DAG: s_mov_b32 [[HI_S_IMM:s[0-9]+]], 1{{$}}
; SI-DAG: buffer_load_dwordx2 v{{\[}}[[LO_VREG:[0-9]+]]:[[HI_VREG:[0-9]+]]{{\]}},
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[LO_S_IMM]], v[[LO_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[HI_S_IMM]], v[[HI_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, 1, v[[HI_VREG]]
; SI: s_endpgm
define void @s_movk_i32_k3(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 addrspace(1)* %b) {
%loada = load i64, i64 addrspace(1)* %a, align 4
@ -59,10 +55,9 @@ define void @s_movk_i32_k3(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 add
; SI-LABEL: {{^}}s_movk_i32_k4:
; SI-DAG: s_mov_b32 [[LO_S_IMM:s[0-9]+]], 0x20000{{$}}
; SI-DAG: s_mov_b32 [[HI_S_IMM:s[0-9]+]], 1{{$}}
; SI-DAG: buffer_load_dwordx2 v{{\[}}[[LO_VREG:[0-9]+]]:[[HI_VREG:[0-9]+]]{{\]}},
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[LO_S_IMM]], v[[LO_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[HI_S_IMM]], v[[HI_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, 1, v[[HI_VREG]]
; SI: s_endpgm
define void @s_movk_i32_k4(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 addrspace(1)* %b) {
%loada = load i64, i64 addrspace(1)* %a, align 4
@ -87,10 +82,9 @@ define void @s_movk_i32_k5(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 add
; SI-LABEL: {{^}}s_movk_i32_k6:
; SI-DAG: s_movk_i32 [[LO_S_IMM:s[0-9]+]], 0x41{{$}}
; SI-DAG: s_mov_b32 [[HI_S_IMM:s[0-9]+]], 63{{$}}
; SI-DAG: buffer_load_dwordx2 v{{\[}}[[LO_VREG:[0-9]+]]:[[HI_VREG:[0-9]+]]{{\]}},
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[LO_S_IMM]], v[[LO_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, [[HI_S_IMM]], v[[HI_VREG]]
; SI-DAG: v_or_b32_e32 {{v[0-9]+}}, 63, v[[HI_VREG]]
; SI: s_endpgm
define void @s_movk_i32_k6(i64 addrspace(1)* %out, i64 addrspace(1)* %a, i64 addrspace(1)* %b) {
%loada = load i64, i64 addrspace(1)* %a, align 4