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RSQRTSS use wrong operand types #40

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Kashio opened this issue Jan 14, 2023 · 2 comments
Closed

RSQRTSS use wrong operand types #40

Kashio opened this issue Jan 14, 2023 · 2 comments

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@Kashio
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Kashio commented Jan 14, 2023

Right now RSQRTSS encoded with opcode F3 0F 52 use operand type ss for its operand of addressing W which is defined as:

Scalar element of a 128-bit packed single-precision floating data.

According to the intel docs:

Computes an approximate reciprocal of the square root of the low single-precision floating-point value in the source operand (second operand) stores the single-precision floating-point result in the destination operand. The source operand can be an XMM register or a 32-bit memory location. The destination operand is an XMM register.

Since it's only operate on the lower 32 bits of the register and the memory variant is also referencing 32 bit memory the operand type should be of type d which is defined as:

Doubleword, regardless of operand-size attribute.

Kashio added a commit to Kashio/x86reference that referenced this issue Jan 14, 2023
Kashio added a commit to Kashio/x86reference that referenced this issue Jan 14, 2023
@BarebitOpenSource
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This one looks right. Refer to #23.

@BarebitOpenSource
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Feel free to reopen this issue if you still think the operand type is wrong.

@BarebitOpenSource BarebitOpenSource closed this as not planned Won't fix, can't repro, duplicate, stale Jan 31, 2024
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