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[hardware] 🐛Fix vasub&vasubu error in simd_alu. #378

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[hardware] 🐛Fix vasub&vasubu error in simd_alu. #378

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46b4dca
[hardware] 🐛Fix vasub&vasubu error in simd_alu.
Bowen-0x00 Sep 6, 2024
d0a819c
Merge branch 'pulp-platform:main' into main
Bowen-0x00 Nov 28, 2024
9ce843f
[hardware] 🐛Fix vssub error in simd_alu.
Bowen-0x00 Nov 28, 2024
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44 changes: 24 additions & 20 deletions hardware/src/lane/simd_alu.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -298,26 +298,30 @@ module simd_alu import ara_pkg::*; import rvv_pkg::*; #(
end
endcase
VSSUB: if (FixPtSupport == FixedPointEnable) unique case (vew_i)
EW8: for (int b = 0; b < 8; b++) begin
automatic logic [8:0] sub = opb.w8 [b] - opa.w8 [b];
vxsat.w8[b] = ^sub[8:7];
res.w8[b] = vxsat.w8[b] ? {8{1'b0}} : sub[7:0];
end
EW16: for (int b = 0; b < 4; b++) begin
automatic logic [16:0] sub = opb.w16[b] - opa.w16[b];
vxsat.w16[b] = {2{^sub[16:15]}};
res.w16[b] = &vxsat.w16[b] ? {16{1'b0}} : sub[15:0];
end
EW32: for (int b = 0; b < 2; b++) begin
automatic logic [32:0] sub = opb.w32[b] - opa.w32[b];
vxsat.w32[b] = {4{^sub[32:31]}};
res.w32[b] = &vxsat.w32[b] ? {32{1'b0}} : sub[31:0];
end
EW64: for (int b = 0; b < 1; b++) begin
automatic logic [64:0] sub = opb.w64[b] - opa.w64[b];
vxsat.w64[b] = {8{^sub[64:63]}};
res.w64[b] = &vxsat.w64[b] ? {64{1'b0}} : sub[63:0];
end
EW8: for (int b = 0; b < 8; b++) begin
automatic logic [8:0] sub = opb.w8[b] - opa.w8[b];
vxsat.w8[b] = (!opb.w8[b][7] & opa.w8[b][7] & sub[7]) |
(opb.w8[b][7] & !opa.w8[b][7] & !sub[7]);
res.w8[b] = vxsat.w8[b] ? (opb.w8[b][7] ? 8'h80 : 8'h7F) : sub[7:0];
end
EW16: for (int b = 0; b < 4; b++) begin
automatic logic [16:0] sub = opb.w16[b] - opa.w16[b];
vxsat.w16[b] = (!opb.w16[b][15] & opa.w16[b][15] & sub[15]) |
(opb.w16[b][15] & !opa.w16[b][15] & !sub[15]);
res.w16[b] = vxsat.w16[b] ? (opb.w16[b][15] ? 16'h8000 : 16'h7FFF) : sub[15:0];
end
EW32: for (int b = 0; b < 2; b++) begin
automatic logic [32:0] sub = opb.w32[b] - opa.w32[b];
vxsat.w32[b] = (!opb.w32[b][31] & opa.w32[b][31] & sub[31]) |
(opb.w32[b][31] & !opa.w32[b][31] & !sub[31]);
res.w32[b] = vxsat.w32[b] ? (opb.w32[b][31] ? 32'h80000000 : 32'h7FFFFFFF) : sub[31:0];
end
EW64: for (int b = 0; b < 1; b++) begin
automatic logic [64:0] sub = opb.w64[b] - opa.w64[b];
vxsat.w64[b] = (!opb.w64[b][63] & opa.w64[b][63] & sub[63]) |
(opb.w64[b][63] & !opa.w64[b][63] & !sub[63]);
res.w64[b] = vxsat.w64[b] ? (opb.w64[b][63] ? 64'h8000000000000000 : 64'h7FFFFFFFFFFFFFFF) : sub[63:0];
end
endcase
VASUB, VASUBU: if (FixPtSupport == FixedPointEnable) unique case (vew_i)
EW8: for (int b = 0; b < 8; b++) begin
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