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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-17 09:10:43 +0200 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-17 09:10:43 +0200 |
| commit | f2ec263023649e596c5076df32c2d328bc9393d2 (patch) | |
| tree | 5dd86caab46e552bd2e62bf9c4fb1a7504a44db4 /results/scraper/fex/4191 | |
| parent | 63d2e9d409831aa8582787234cae4741847504b7 (diff) | |
| download | qemu-analysis-main.tar.gz qemu-analysis-main.zip | |
Diffstat (limited to 'results/scraper/fex/4191')
| -rw-r--r-- | results/scraper/fex/4191 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/results/scraper/fex/4191 b/results/scraper/fex/4191 new file mode 100644 index 000000000..dfa6f6e62 --- /dev/null +++ b/results/scraper/fex/4191 @@ -0,0 +1,12 @@ +Double check x87 precision correctness +x86 manual had a couple statements that caught my eye. + + +> The Precision control (PC) field comprises bits [9:8] of the x87 control word (“x87 Control Word Register (FCW)” on page 292). This field specifies the precision of floating-point calculations for the FADDx, FSUBx, FMULx, FDIVx, and FSQRT instructions, as shown in Table 6-11. + +I think we modify precision on more than those instructions listed. Might need to check that. + +Also: +> x87 computations are carried out in double-extended-precision format, so that the transcendental functions provide results accurate to within one unit in the last place (ulp) for each of the floating- point data types. + +Might want to double check that we have the transcendental accuracy correct. \ No newline at end of file |