[Mesa-dev] [PATCH] R600/SI: fix MIMG writemask adjustement
Tom Stellard
tom at stellard.net
Tue Oct 22 19:57:32 PDT 2013
Pushed, thanks.
-Tom
On Tue, Oct 22, 2013 at 02:15:01AM +0200, Marek Ol????k wrote:
> From: Marek Ol????k <marek.olsak at amd.com>
>
> This fixes piglit:
> - shaders/glsl-fs-texture2d-masked
> - shaders/glsl-fs-texture2d-masked-4
>
> Signed-off-by: Marek Ol????k <marek.olsak at amd.com>
> Reviewed-by: Tom Stellard <thomas.stellard at amd.com>
> ---
> lib/Target/R600/SIISelLowering.cpp | 27 +++++++--
> test/CodeGen/R600/llvm.SI.sample-masked.ll | 93 ++++++++++++++++++++++++++++++
> 2 files changed, 114 insertions(+), 6 deletions(-)
> create mode 100644 test/CodeGen/R600/llvm.SI.sample-masked.ll
>
> diff --git a/lib/Target/R600/SIISelLowering.cpp b/lib/Target/R600/SIISelLowering.cpp
> index 2c9270e..bfc9e8d 100644
> --- a/lib/Target/R600/SIISelLowering.cpp
> +++ b/lib/Target/R600/SIISelLowering.cpp
> @@ -1065,7 +1065,9 @@ static unsigned SubIdx2Lane(unsigned Idx) {
> void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
> SelectionDAG &DAG) const {
> SDNode *Users[4] = { };
> - unsigned Writemask = 0, Lane = 0;
> + unsigned Lane = 0;
> + unsigned OldDmask = Node->getConstantOperandVal(0);
> + unsigned NewDmask = 0;
>
> // Try to figure out the used register components
> for (SDNode::use_iterator I = Node->use_begin(), E = Node->use_end();
> @@ -1076,29 +1078,42 @@ void SITargetLowering::adjustWritemask(MachineSDNode *&Node,
> I->getMachineOpcode() != TargetOpcode::EXTRACT_SUBREG)
> return;
>
> + // Lane means which subreg of %VGPRa_VGPRb_VGPRc_VGPRd is used.
> + // Note that subregs are packed, i.e. Lane==0 is the first bit set
> + // in OldDmask, so it can be any of X,Y,Z,W; Lane==1 is the second bit
> + // set, etc.
> Lane = SubIdx2Lane(I->getConstantOperandVal(1));
>
> + // Set which texture component corresponds to the lane.
> + unsigned Comp;
> + for (unsigned i = 0, Dmask = OldDmask; i <= Lane; i++) {
> + assert(Dmask);
> + Comp = ffs(Dmask)-1;
> + Dmask &= ~(1 << Comp);
> + }
> +
> // Abort if we have more than one user per component
> if (Users[Lane])
> return;
>
> Users[Lane] = *I;
> - Writemask |= 1 << Lane;
> + NewDmask |= 1 << Comp;
> }
>
> - // Abort if all components are used
> - if (Writemask == 0xf)
> + // Abort if there's no change
> + if (NewDmask == OldDmask)
> return;
>
> // Adjust the writemask in the node
> std::vector<SDValue> Ops;
> - Ops.push_back(DAG.getTargetConstant(Writemask, MVT::i32));
> + Ops.push_back(DAG.getTargetConstant(NewDmask, MVT::i32));
> for (unsigned i = 1, e = Node->getNumOperands(); i != e; ++i)
> Ops.push_back(Node->getOperand(i));
> Node = (MachineSDNode*)DAG.UpdateNodeOperands(Node, Ops.data(), Ops.size());
>
> // If we only got one lane, replace it with a copy
> - if (Writemask == (1U << Lane)) {
> + // (if NewDmask has only one bit set...)
> + if (NewDmask && (NewDmask & (NewDmask-1)) == 0) {
> SDValue RC = DAG.getTargetConstant(AMDGPU::VReg_32RegClassID, MVT::i32);
> SDNode *Copy = DAG.getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
> SDLoc(), Users[Lane]->getValueType(0),
> diff --git a/test/CodeGen/R600/llvm.SI.sample-masked.ll b/test/CodeGen/R600/llvm.SI.sample-masked.ll
> new file mode 100644
> index 0000000..454e48b
> --- /dev/null
> +++ b/test/CodeGen/R600/llvm.SI.sample-masked.ll
> @@ -0,0 +1,93 @@
> +;RUN: llc < %s -march=r600 -mcpu=verde | FileCheck %s
> +
> +; CHECK-LABEL: @v1
> +; CHECK: IMAGE_SAMPLE VGPR{{[[0-9]}}_VGPR{{[0-9]}}_VGPR{{[0-9]}}, 13
> +define void @v1(i32 %a1) {
> +entry:
> + %0 = insertelement <1 x i32> undef, i32 %a1, i32 0
> + %1 = call <4 x float> @llvm.SI.sample.v1i32(<1 x i32> %0, <32 x i8> undef, <16 x i8> undef, i32 0)
> + %2 = extractelement <4 x float> %1, i32 0
> + %3 = extractelement <4 x float> %1, i32 2
> + %4 = extractelement <4 x float> %1, i32 3
> + call void @llvm.SI.export(i32 15, i32 0, i32 1, i32 12, i32 0, float %2, float %3, float %4, float %4)
> + ret void
> +}
> +
> +; CHECK-LABEL: @v2
> +; CHECK: IMAGE_SAMPLE VGPR{{[[0-9]}}_VGPR{{[0-9]}}_VGPR{{[0-9]}}, 11
> +define void @v2(i32 %a1) {
> +entry:
> + %0 = insertelement <1 x i32> undef, i32 %a1, i32 0
> + %1 = call <4 x float> @llvm.SI.sample.v1i32(<1 x i32> %0, <32 x i8> undef, <16 x i8> undef, i32 0)
> + %2 = extractelement <4 x float> %1, i32 0
> + %3 = extractelement <4 x float> %1, i32 1
> + %4 = extractelement <4 x float> %1, i32 3
> + call void @llvm.SI.export(i32 15, i32 0, i32 1, i32 12, i32 0, float %2, float %3, float %4, float %4)
> + ret void
> +}
> +
> +; CHECK-LABEL: @v3
> +; CHECK: IMAGE_SAMPLE VGPR{{[[0-9]}}_VGPR{{[0-9]}}_VGPR{{[0-9]}}, 14
> +define void @v3(i32 %a1) {
> +entry:
> + %0 = insertelement <1 x i32> undef, i32 %a1, i32 0
> + %1 = call <4 x float> @llvm.SI.sample.v1i32(<1 x i32> %0, <32 x i8> undef, <16 x i8> undef, i32 0)
> + %2 = extractelement <4 x float> %1, i32 1
> + %3 = extractelement <4 x float> %1, i32 2
> + %4 = extractelement <4 x float> %1, i32 3
> + call void @llvm.SI.export(i32 15, i32 0, i32 1, i32 12, i32 0, float %2, float %3, float %4, float %4)
> + ret void
> +}
> +
> +; CHECK-LABEL: @v4
> +; CHECK: IMAGE_SAMPLE VGPR{{[[0-9]}}_VGPR{{[0-9]}}_VGPR{{[0-9]}}, 7
> +define void @v4(i32 %a1) {
> +entry:
> + %0 = insertelement <1 x i32> undef, i32 %a1, i32 0
> + %1 = call <4 x float> @llvm.SI.sample.v1i32(<1 x i32> %0, <32 x i8> undef, <16 x i8> undef, i32 0)
> + %2 = extractelement <4 x float> %1, i32 0
> + %3 = extractelement <4 x float> %1, i32 1
> + %4 = extractelement <4 x float> %1, i32 2
> + call void @llvm.SI.export(i32 15, i32 0, i32 1, i32 12, i32 0, float %2, float %3, float %4, float %4)
> + ret void
> +}
> +
> +; CHECK-LABEL: @v5
> +; CHECK: IMAGE_SAMPLE VGPR{{[[0-9]}}_VGPR{{[0-9]}}, 10
> +define void @v5(i32 %a1) {
> +entry:
> + %0 = insertelement <1 x i32> undef, i32 %a1, i32 0
> + %1 = call <4 x float> @llvm.SI.sample.v1i32(<1 x i32> %0, <32 x i8> undef, <16 x i8> undef, i32 0)
> + %2 = extractelement <4 x float> %1, i32 1
> + %3 = extractelement <4 x float> %1, i32 3
> + call void @llvm.SI.export(i32 15, i32 0, i32 1, i32 12, i32 0, float %2, float %3, float %3, float %3)
> + ret void
> +}
> +
> +; CHECK-LABEL: @v6
> +; CHECK: IMAGE_SAMPLE VGPR{{[[0-9]}}_VGPR{{[0-9]}}, 6
> +define void @v6(i32 %a1) {
> +entry:
> + %0 = insertelement <1 x i32> undef, i32 %a1, i32 0
> + %1 = call <4 x float> @llvm.SI.sample.v1i32(<1 x i32> %0, <32 x i8> undef, <16 x i8> undef, i32 0)
> + %2 = extractelement <4 x float> %1, i32 1
> + %3 = extractelement <4 x float> %1, i32 2
> + call void @llvm.SI.export(i32 15, i32 0, i32 1, i32 12, i32 0, float %2, float %3, float %3, float %3)
> + ret void
> +}
> +
> +; CHECK-LABEL: @v7
> +; CHECK: IMAGE_SAMPLE VGPR{{[[0-9]}}_VGPR{{[0-9]}}, 9
> +define void @v7(i32 %a1) {
> +entry:
> + %0 = insertelement <1 x i32> undef, i32 %a1, i32 0
> + %1 = call <4 x float> @llvm.SI.sample.v1i32(<1 x i32> %0, <32 x i8> undef, <16 x i8> undef, i32 0)
> + %2 = extractelement <4 x float> %1, i32 0
> + %3 = extractelement <4 x float> %1, i32 3
> + call void @llvm.SI.export(i32 15, i32 0, i32 1, i32 12, i32 0, float %2, float %3, float %3, float %3)
> + ret void
> +}
> +
> +declare <4 x float> @llvm.SI.sample.v1i32(<1 x i32>, <32 x i8>, <16 x i8>, i32) readnone
> +
> +declare void @llvm.SI.export(i32, i32, i32, i32, i32, float, float, float, float)
> --
> 1.8.1.2
>
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