diff options
Diffstat (limited to 'mu_instructions')
| -rw-r--r-- | mu_instructions | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mu_instructions b/mu_instructions index 9e7f26bc..f93bb685 100644 --- a/mu_instructions +++ b/mu_instructions @@ -327,10 +327,19 @@ var/xreg <- convert var2/reg2 => "f3 0f 2a/convert-to-float %" reg2 " " xreg var/xreg <- convert var2 => "f3 0f 2a/convert-to-float *(ebp+" var2.stack-offset ") " xreg "/x32" var/xreg <- convert *var2/reg2 => "f3 0f 2a/convert-to-float *" reg2 " " xreg "/x32" +Converting floats to ints performs rounding by default. (We don't mess with the +MXCSR control register.) + var/reg <- convert var2/xreg2 => "f3 0f 2d/convert-to-int %" xreg2 " " reg "/r32" var/reg <- convert var2 => "f3 0f 2d/convert-to-int *(ebp+" var2.stack-offset ") " reg "/r32" var/reg <- convert *var2/reg2 => "f3 0f 2d/convert-to-int *" reg2 " " reg "/r32" +There's a separate instruction for truncating the fractional part. + +var/reg <- truncate var2/xreg2 => "f3 0f 2c/truncate-to-int %" xreg2 " " reg "/r32" +var/reg <- truncate var2 => "f3 0f 2c/truncate-to-int *(ebp+" var2.stack-offset ") " reg "/r32" +var/reg <- truncate *var2/reg2 => "f3 0f 2c/truncate-to-int *" reg2 " " reg "/r32" + There are no instructions accepting floating-point literals. To obtain integer literals in floating-point registers, copy them to general-purpose registers and then convert them to floating-point. |