在 2022/12/7 下午6:05, Richard Sandiford 写道:
Lulu Cheng <chengl...@loongson.cn> writes:gcc/ChangeLog: * doc/rtl.texi: Correct a clerical error in the document. --- gcc/doc/rtl.texi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index 43c9ee8bffe..44858d12892 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -2142,7 +2142,7 @@ stores the lower 2 bytes of @var{y} in @var{x} and discards the upper (set @var{z} (subreg:SI (reg:HI @var{x}) 0)) @end smallexample-would set the lower two bytes of @var{z} to @var{y} and set the upper+would set the lower two bytes of @var{z} to @var{x} and set the upper two bytes to an unknown value assuming @code{SUBREG_PROMOTED_VAR_P} is false.Both versions are right in their way. I think the intention of the original was to show the effect of moving y to z via a paradoxical subreg on x. How about: would set the lower two bytes of @var{z} to @var{x} (which contains the lower two bytes of @var{y}) and set the upper ... OK with that change if you agree. Richard
Ah, I see. The second test case follows the first test case. :-) So I think this change is not necessary. Thanks.
