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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/il.txt | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/doc/il.txt b/doc/il.txt index 288c6ca..308fe45 100644 --- a/doc/il.txt +++ b/doc/il.txt @@ -744,11 +744,11 @@ returns 1 when the first argument is smaller than the second one. ~ Conversions ~~~~~~~~~~~~~ -Conversion operations allow to change the representation of -a value, possibly modifying it if the target type cannot hold -the value of the source type. Conversions can extend the -precision of a temporary (e.g., from signed 8-bit to 32-bit), -or convert a floating point into an integer and vice versa. +Conversion operations change the representation of a value, +possibly modifying it if the target type cannot hold the value +of the source type. Conversions can extend the precision of a +temporary (e.g., from signed 8-bit to 32-bit), or convert a +floating point into an integer and vice versa. * `extsw`, `extuw` -- `l(w)` * `extsh`, `extuh` -- `I(ww)` @@ -766,17 +766,17 @@ or convert a floating point into an integer and vice versa. Extending the precision of a temporary is done using the `ext` family of instructions. Because QBE types do not -precise the signedness (like in LLVM), extension instructions +specify the signedness (like in LLVM), extension instructions exist to sign-extend and zero-extend a value. For example, `extsb` takes a word argument and sign-extends the 8 least-significant bits to a full word or long, depending on the return type. -The instructions `exts` and `truncd` are provided to change -the precision of a floating point value. When the double -argument of `truncd` cannot be represented as a -single-precision floating point, it is truncated towards -zero. +The instructions `exts` (extend single) and `truncd` (truncate +double) are provided to change the precision of a floating +point value. When the double argument of `truncd` cannot +be represented as a single-precision floating point, it is +truncated towards zero. Converting between signed integers and floating points is done using `stosi` (single to signed integer), `stoui` (single to |