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target/arm: Fix VUDOT/VSDOT (scalar) on big-endian hosts

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The helper functions for performing the udot/sdot operations against
a scalar were not using an address-swizzling macro when converting
the index of the scalar element into a pointer into the vm array.
This had no effect on little-endian hosts but meant we generated
incorrect results on big-endian hosts.

For these insns, the index is indexing over group of 4 8-bit values,
so 32 bits per indexed entity, and H4() is therefore what we want.
(For Neon the only possible input indexes are 0 and 1.)

Backports d1a9254be5cc93afb15be19f7543da6ff4806256
This commit is contained in:
Peter Maydell 2021-03-02 13:03:49 -05:00 committed by Lioncash
parent 5c6730a432
commit 6b8096d9fc
1 changed files with 2 additions and 2 deletions
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4
qemu/target/arm/vec_helper.c
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@ -294,7 +294,7 @@ void HELPER(gvec_sdot_idx_b)(void *vd, void *vn, void *vm, uint32_t desc)
intptr_t index = simd_data(desc);
uint32_t *d = vd;
int8_t *n = vn;
int8_t *m_indexed = (int8_t *)vm + index * 4;
int8_t *m_indexed = (int8_t *)vm + H4(index) * 4;
/* Notice the special case of opr_sz == 8, from aa64/aa32 advsimd.
* Otherwise opr_sz is a multiple of 16.
@ -325,7 +325,7 @@ void HELPER(gvec_udot_idx_b)(void *vd, void *vn, void *vm, uint32_t desc)
intptr_t index = simd_data(desc);
uint32_t *d = vd;
uint8_t *n = vn;
uint8_t *m_indexed = (uint8_t *)vm + index * 4;
uint8_t *m_indexed = (uint8_t *)vm + H4(index) * 4;
/* Notice the special case of opr_sz == 8, from aa64/aa32 advsimd.
* Otherwise opr_sz is a multiple of 16.