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docs/devel/tcg-ops: Bury mentions of trunc_shr_i64_i32() 

Commit 609ad70562 ("tcg: Split trunc_shr_i32 opcode into
extr[lh]_i64_i32") remove trunc_shr_i64_i32(). Update the
backend documentation.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230822162847.71206-1-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Philippe Mathieu-Daudé 2023-08-22 18:28:47 +02:00 committed by Richard Henderson
parent 73f97f0aa3
commit bb9d7ee83e
1 changed files with 4 additions and 3 deletions
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7
docs/devel/tcg-ops.rst
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@ -882,14 +882,15 @@ sub2_i32, brcond2_i32).
On a 64 bit target, the values are transferred between 32 and 64-bit
registers using the following ops:
- trunc_shr_i64_i32
- extrl_i64_i32
- extrh_i64_i32
- ext_i32_i64
- extu_i32_i64
They ensure that the values are correctly truncated or extended when
moved from a 32-bit to a 64-bit register or vice-versa. Note that the
trunc_shr_i64_i32 is an optional op. It is not necessary to implement
it if all the following conditions are met:
extrl_i64_i32 and extrh_i64_i32 are optional ops. It is not necessary
to implement them if all the following conditions are met:
- 64-bit registers can hold 32-bit values
- 32-bit values in a 64-bit register do not need to stay zero or