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arch-gcn3: implement instruction s_setreg_b32

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Instruction s_setreg_b32 was unimplemented, but is used by hipified
rodinia 'srad'. The instruction sets values of hardware internal
registers. If the instruction is writing into MODE to control
single-precision FP round and denorm modes, a simple warn will be
printed; for all other cases (non-MODE hw register or other
precisions), panic will happen.

Change-Id: Idb1cd5f60548a146bc980f1a27faff30259e74ce
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29949
Maintainer: Anthony Gutierrez <anthony.gutierrez@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Xianwei Zhang <xianwei.zhang@amd.com>
This commit is contained in:
Xianwei Zhang
2018-05-24 13:01:49 -04:00
committed by Anthony Gutierrez
parent 1836d58b36
commit fff185993a
1 changed files with 27 additions and 0 deletions
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27
src/arch/gcn3/insts/instructions.cc
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@@ -1800,6 +1800,7 @@ namespace Gcn3ISA
Inst_SOPK__S_SETREG_B32::Inst_SOPK__S_SETREG_B32(InFmt_SOPK *iFmt)
: Inst_SOPK(iFmt, "s_setreg_b32")
{
setFlag(ALU);
} // Inst_SOPK__S_SETREG_B32
Inst_SOPK__S_SETREG_B32::~Inst_SOPK__S_SETREG_B32()
@@ -1813,6 +1814,32 @@ namespace Gcn3ISA
void
Inst_SOPK__S_SETREG_B32::execute(GPUDynInstPtr gpuDynInst)
{
ScalarRegI16 simm16 = instData.SIMM16;
ScalarRegU32 hwregId = simm16 & 0x3f;
ScalarRegU32 offset = (simm16 >> 6) & 31;
ScalarRegU32 size = ((simm16 >> 11) & 31) + 1;
ScalarOperandU32 hwreg(gpuDynInst, hwregId);
ScalarOperandU32 sdst(gpuDynInst, instData.SDST);
hwreg.read();
sdst.read();
// Store value from SDST to part of the hardware register.
ScalarRegU32 mask = (((1U << size) - 1U) << offset);
hwreg = ((hwreg.rawData() & ~mask)
| ((sdst.rawData() << offset) & mask));
hwreg.write();
// set MODE register to control the behavior of single precision
// floating-point numbers: denormal mode or round mode
if (hwregId==1 && size==2
&& (offset==4 || offset==0)) {
warn_once("Be cautious that s_setreg_b32 has no real effect "
"on FP modes: %s\n", gpuDynInst->disassemble());
return;
}
// panic if not changing MODE of floating-point numbers
panicUnimplemented();
}