Searched hist:13931 (Results 1 - 3 of 3) sorted by relevance
| /gem5/src/arch/riscv/isa/formats/ | ||
| H A D | compressed.isa | 13931:31e62b71cca6 Thu Apr 04 16:20:00 EDT 2019 Avishai Tvila <avishai.tvila@gmail.com> arch-riscv,isa: Fix for compressed jump (c_j) imm c_j(al) has a special format, called CJ. The jump offset format is instbits[12:2] --> offset[11|4|9:8|10|6|7|3:1|5] Currently in decoder.isa, c_j format is JOp, the imm and branchTarget are incorrect In the execute section (decoder.isa:228), the imm fields is ignored and the offset is calculated correctlly. As a result, we get decoder flush for each c_j instance I've added CJOp format in compressed.isa, and use it in execute section. In addition, c_j is mappped to jal zero, cj_imm, and actually is neither indirect control nor a function call I fixed the flags accordently. I'll fix all IsRet, IsCall and IsIndirectControl flags for rest of (c_)jal(r) in my next commit. I ran coremark -O0 before my fix and I got 37.7% branch miss-rate, after the fix the branch miss-rate is <13% Change-Id: I608d5894a78a1ebefe36f21e21aaea68b42bccfc Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17808 Maintainer: Jason Lowe-Power <jason@lowepower.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Alec Roelke <alec.roelke@gmail.com> |
| /gem5/src/arch/riscv/isa/ | ||
| H A D | bitfields.isa | 13931:31e62b71cca6 Thu Apr 04 16:20:00 EDT 2019 Avishai Tvila <avishai.tvila@gmail.com> arch-riscv,isa: Fix for compressed jump (c_j) imm c_j(al) has a special format, called CJ. The jump offset format is instbits[12:2] --> offset[11|4|9:8|10|6|7|3:1|5] Currently in decoder.isa, c_j format is JOp, the imm and branchTarget are incorrect In the execute section (decoder.isa:228), the imm fields is ignored and the offset is calculated correctlly. As a result, we get decoder flush for each c_j instance I've added CJOp format in compressed.isa, and use it in execute section. In addition, c_j is mappped to jal zero, cj_imm, and actually is neither indirect control nor a function call I fixed the flags accordently. I'll fix all IsRet, IsCall and IsIndirectControl flags for rest of (c_)jal(r) in my next commit. I ran coremark -O0 before my fix and I got 37.7% branch miss-rate, after the fix the branch miss-rate is <13% Change-Id: I608d5894a78a1ebefe36f21e21aaea68b42bccfc Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17808 Maintainer: Jason Lowe-Power <jason@lowepower.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Alec Roelke <alec.roelke@gmail.com> |
| H A D | decoder.isa | 13931:31e62b71cca6 Thu Apr 04 16:20:00 EDT 2019 Avishai Tvila <avishai.tvila@gmail.com> arch-riscv,isa: Fix for compressed jump (c_j) imm c_j(al) has a special format, called CJ. The jump offset format is instbits[12:2] --> offset[11|4|9:8|10|6|7|3:1|5] Currently in decoder.isa, c_j format is JOp, the imm and branchTarget are incorrect In the execute section (decoder.isa:228), the imm fields is ignored and the offset is calculated correctlly. As a result, we get decoder flush for each c_j instance I've added CJOp format in compressed.isa, and use it in execute section. In addition, c_j is mappped to jal zero, cj_imm, and actually is neither indirect control nor a function call I fixed the flags accordently. I'll fix all IsRet, IsCall and IsIndirectControl flags for rest of (c_)jal(r) in my next commit. I ran coremark -O0 before my fix and I got 37.7% branch miss-rate, after the fix the branch miss-rate is <13% Change-Id: I608d5894a78a1ebefe36f21e21aaea68b42bccfc Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17808 Maintainer: Jason Lowe-Power <jason@lowepower.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com> Reviewed-by: Alec Roelke <alec.roelke@gmail.com> |
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