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Fixed c.slli hint discovered by Lee (Issue 910)

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David Harris 2024-08-13 06:45:45 -07:00
parent a1c025e7a7
commit ca82a63de6
1 changed files with 6 additions and 3 deletions
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9
src/ifu/decompress.sv
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@ -148,9 +148,12 @@ module decompress import cvw::*; #(parameter cvw_t P) (
5'b01101: LInstrD = {1'b1, immCJ, 5'b00000, 7'b1101111}; // c.j
5'b01110: LInstrD = {1'b1, immCB[11:5], 5'b00000, rs1p, 3'b000, immCB[4:0], 7'b1100011}; // c.beqz
5'b01111: LInstrD = {1'b1, immCB[11:5], 5'b00000, rs1p, 3'b001, immCB[4:0], 7'b1100011}; // c.bnez
5'b10000: if (rds1 != 5'b0) begin
if (P.XLEN > 32 | ~immSH[5]) LInstrD = {1'b1, 6'b000000, immSH, rds1, 3'b001, rds1, 7'b0010011}; // c.slli; shamt[5] must be 0 in RV32C
end else if (immSH != 0) LInstrD = {1'b1, 25'b0, 7'b0010011}; // c.slli with rd = 0, immm != 0 is a HINT, treated as nop
5'b10000: if (immSH != 0) begin
if (P.XLEN > 32 | ~immSH[5]) begin // shamt[5] = 1 is reserved in RV32C
if (rds1 != 5'b0) LInstrD = {1'b1, 6'b000000, immSH, rds1, 3'b001, rds1, 7'b0010011}; // c.slli
else LInstrD = {1'b1, 25'b0, 7'b0010011}; // c.slli with rd = 0 is a HINT, treated as nop
end
end else LInstrD = {1'b1, 25'b0, 7'b0010011}; // c.slli with immm = 0 is a HINT, treated as nop
5'b10001: if (P.ZCD_SUPPORTED) LInstrD = {1'b1, immCILSPD, 5'b00010, 3'b011, rds1, 7'b0000111}; // c.fldsp
5'b10010: if (rds1 != 5'b0) LInstrD = {1'b1, immCILSP, 5'b00010, 3'b010, rds1, 7'b0000011}; // c.lwsp
5'b10011: if (P.XLEN == 32) begin