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| From: | Richard Henderson |
| Subject: | Re: [RFC PATCH 01/43] target/loongarch: Add vector data type vec_t |
| Date: | Wed, 28 Dec 2022 19:13:39 -0800 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 |
On 12/28/22 17:51, gaosong wrote:
A related question though: does the manual mention whether the fpu instructions only modify the lower 64 bits, or do the high 64-bits become zeroed, nanboxed, or unspecified?Only modify the lower 64bits, the high 64-bits is unpecified.
These two options are mutually exclusive. If upper 64 bits unmodified, then they *are* specified to be the previous contents.
r~
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