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target/arm: Introduce PREDDESC field definitions

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SVE predicate operations cannot use the "usual" simd_desc
encoding, because the lengths are not a multiple of 8.
But we were abusing the SIMD_* fields to store values anyway.
This abuse broke when SIMD_OPRSZ_BITS was modified in e2e7168a214.

Introduce a new set of field definitions for exclusive use
of predicates, so that it is obvious what kind of predicate
we are manipulating. To be used in future patches

Backports b64ee454a4a086ed459bcda4c0bbb54e197841e4
This commit is contained in:
Richard Henderson 2021-03-04 15:08:24 -05:00 committed by Lioncash
parent 9dfa469976
commit 4ef4735cd3
1 changed files with 9 additions and 0 deletions
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9
qemu/target/arm/internals.h
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@ -1348,6 +1348,15 @@ bool get_phys_addr(CPUARMState *env, target_ulong address,
#define LOG2_TAG_GRANULE 4
#define TAG_GRANULE (1 << LOG2_TAG_GRANULE)
/*
* SVE predicates are 1/8 the size of SVE vectors, and cannot use
* the same simd_desc() encoding due to restrictions on size.
* Use these instead.
*/
FIELD(PREDDESC, OPRSZ, 0, 6)
FIELD(PREDDESC, ESZ, 6, 2)
FIELD(PREDDESC, DATA, 8, 24)
/*
* The SVE simd_data field, for memory ops, contains either
* rd (5 bits) or a shift count (2 bits).