ref: d25b147ccbeff5b7f086b2e43d835543aaa8e6dd
parent: cbdb7d937450b0905b465fec2be2f84a66541cbc
author: S. Gilles <sgilles@math.umd.edu>
date: Tue Apr 17 15:38:45 EDT 2018
Boilerplate FP control word code for ASM round.
--- a/lib/math/round-impl+posixy-x64-sse4.s
+++ b/lib/math/round-impl+posixy-x64-sse4.s
@@ -2,7 +2,16 @@
.globl math$_rn32
math$rn32:
math$_rn32:
+ pushq %rbp
+ movq %rsp, %rbp
+ subq $16, %rsp
+ fnstcw (%rsp)
+ fnstcw 8(%rsp)
+ andl $0xf3ff, 8(%rsp)
+ fldcw 8(%rsp)
cvtss2si %xmm0, %eax
+ fldcw (%rsp)
+ leave
ret
.globl math$rn64
@@ -9,6 +18,15 @@
.globl math$_rn64
math$rn64:
math$_rn64:
+ pushq %rbp
+ movq %rsp, %rbp
+ subq $16, %rsp
+ fnstcw (%rsp)
+ fnstcw 8(%rsp)
+ andl $0xf3ff, 8(%rsp)
+ fldcw 8(%rsp)
cvtsd2si %xmm0, %rax
+ fldcw (%rsp)
+ leave
ret