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author | Carol Eidt <carol.eidt@microsoft.com> | 2018-10-09 16:57:03 +0000 |
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committer | GitHub <noreply@github.com> | 2018-10-09 16:57:03 +0000 |
commit | fe00e42185494bb7f27590909d5013b3fc3bbfa7 (patch) | |
tree | 59b8ac16849d1d24d43a1ae03eaddac868358c22 /src/jit/gentree.h | |
parent | 20cbebbeb151acf901d686dc6beb3a51435edd3d (diff) | |
parent | 649d6653ca36f39cfa50cdd92c9efc7f319e24bc (diff) | |
download | coreclr-fe00e42185494bb7f27590909d5013b3fc3bbfa7.tar.gz coreclr-fe00e42185494bb7f27590909d5013b3fc3bbfa7.tar.bz2 coreclr-fe00e42185494bb7f27590909d5013b3fc3bbfa7.zip |
Merge pull request #20078 from CarolEidt/Fix20063
Handle partial multireg COPY
Diffstat (limited to 'src/jit/gentree.h')
-rw-r--r-- | src/jit/gentree.h | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/src/jit/gentree.h b/src/jit/gentree.h index 3fecf008a6..ebeae48cc0 100644 --- a/src/jit/gentree.h +++ b/src/jit/gentree.h @@ -5524,22 +5524,25 @@ struct GenTreeCopyOrReload : public GenTreeUnOp unsigned GetRegCount() { - if (gtRegNum == REG_NA) - { - return 0; - } #if FEATURE_MULTIREG_RET - for (unsigned i = 0; i < MAX_RET_REG_COUNT - 1; ++i) + // We need to return the highest index for which we have a valid register. + // Note that the gtOtherRegs array is off by one (the 0th register is gtRegNum). + // If there's no valid register in gtOtherRegs, gtRegNum must be valid. + // Note that for most nodes, the set of valid registers must be contiguous, + // but for COPY or RELOAD there is only a valid register for the register positions + // that must be copied or reloaded. + // + for (unsigned i = MAX_RET_REG_COUNT; i > 1; i--) { - if (gtOtherRegs[i] == REG_NA) + if (gtOtherRegs[i - 2] != REG_NA) { - return i + 1; + return i; } } - return MAX_RET_REG_COUNT; -#else - return 1; #endif + // We should never have a COPY or RELOAD with no valid registers. + assert(gtRegNum != REG_NA); + return 1; } GenTreeCopyOrReload(genTreeOps oper, var_types type, GenTree* op1) : GenTreeUnOp(oper, type, op1) |