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target/arm: Correct comments about M-profile FPSCR

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The M-profile FPSCR LTPSIZE is bits [18:16]; this is the same
field as A-profile FPSCR Len, not Stride. Correct the comment
in vfp_get_fpscr().

We also implemented M-profile FPSCR.QC, but forgot to delete
a TODO comment from vfp_set_fpscr(); remove it now.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20240628142347.1283015-2-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell
2024-07-11 11:41:33 +01:00
parent 59084feb25
commit ea8618382a
1 changed files with 2 additions and 3 deletions
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target/arm/vfp_helper.c
+2 -3
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@@ -176,8 +176,8 @@ uint32_t HELPER(vfp_get_fpscr)(CPUARMState *env)
| (env->vfp.vec_stride << 20);
/*
* M-profile LTPSIZE overlaps A-profile Stride; whichever of the
* two is not applicable to this CPU will always be zero.
* M-profile LTPSIZE is the same bits [18:16] as A-profile Len; whichever
* of the two is not applicable to this CPU will always be zero.
*/
fpscr |= env->v7m.ltpsize << 16;
@@ -226,7 +226,6 @@ void HELPER(vfp_set_fpscr)(CPUARMState *env, uint32_t val)
/*
* The bit we set within fpscr_q is arbitrary; the register as a
* whole being zero/non-zero is what counts.
* TODO: M-profile MVE also has a QC bit.
*/
env->vfp.qc[0] = val & FPCR_QC;
env->vfp.qc[1] = 0;