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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
.text
.align 2
.global __gtsf2
.type __gtsf2, @function
__gtsf2:
! ---------------------------------------------------------------------
! int __gtsf2(float a, float b):
! This function returns a value greater than zero if neither argument
! is NaN and a is strictly greater than b.
! ---------------------------------------------------------------------
.global __gesf2
.type __gesf2, @function
__gesf2:
! ---------------------------------------------------------------------
! int __gesf2(float a, float b):
! This function returns a value greater than or equal to zero if
! neither argument is NaN and a is greater than or equal to b.
! ---------------------------------------------------------------------
move $r4, #-1
b .LA
.global __eqsf2
.type __eqsf2, @function
__eqsf2:
! ---------------------------------------------------------------------
! int __eqsf2(float a, float b):
! This function returns zero value if neither argument is NaN,
! and a and b are equal.
! ---------------------------------------------------------------------
.global __nesf2
.type __nesf2, @function
__nesf2:
! ---------------------------------------------------------------------
! int __nesf2(float a, float b):
! This function returns a nonzero value if either argument is NaN or if
! a and b are unequal.
! ---------------------------------------------------------------------
.global __lesf2
.type __lesf2, @function
__lesf2:
! ---------------------------------------------------------------------
! int __lesf2(float a, float b):
! This function returns a value less than or equal to zero if neither
! argument is NaN and a is less than b.
! ---------------------------------------------------------------------
.global __ltsf2
.type __ltsf2, @function
__ltsf2:
! ---------------------------------------------------------------------
! int __ltsf2(float a, float b):
! This function returns a value less than zero if neither argument is
! NaN and a is strictly less than b.
! ---------------------------------------------------------------------
.global __cmpsf2
.type __cmpsf2, @function
__cmpsf2:
! ---------------------------------------------------------------------
! int __cmpsf2(float a, float b);
! This function calculates a <=> b. That is, if a is less than b, it
! returns -1; if a if greater than b, it returns 1; and if a and b are
! equal, it returns 0. If either argument is NaN, it returns 1, But you
! should not rely on this; If NaN is a possibility, use higher-level
! comparison function __unordsf2().
! ---------------------------------------------------------------------
move $r4, #1
.align 2
.LA:
move $r5, #0xff000000
slli $r2, $r0, #1
slt $r15, $r5, $r2
bnez $r15, .LMnan ! a is NaN
slli $r3, $r1, #1
slt $r15, $r5, $r3
bnez $r15, .LMnan ! b is NaN
xor $r5, $r0, $r1 ! a and b have same sign?
bgez $r5, .LSameSign
.LDiffSign:
or $r2, $r2, $r3
beqz $r2, .LMequ ! 0.0f and -0.0f are equal
move $r2, #1 ! when a==0.0f, return 1
cmovz $r0, $r2, $r0 ! otherwise, simply return a
ret5 $lp
.LSameSign:
sltsi $r15, $r0, 0 ! a < 0 ?
bnez $r15, .LSameSignNeg
.LSameSignPos:
! a >= 0 && b >= 0, return a - b
sub $r0, $r0, $r1
ret5 $lp
.LSameSignNeg:
! a < 0 && b < 0, return b - a
sub $r0, $r1, $r0
ret5 $lp
.LMequ:
move $r0, #0
ret5 $lp
.LMnan:
move $r0, $r4
ret5 $lp
.size __cmpsf2, .-__cmpsf2
.size __ltsf2, .-__ltsf2
.size __lesf2, .-__lesf2
.size __nesf2, .-__nesf2
.size __eqsf2, .-__eqsf2
.size __gesf2, .-__gesf2
.size __gtsf2, .-__gtsf2
#define MANTA $r0
#define EXPOA $r1
.text
.align 2
.global __floatsisf
.type __floatsisf, @function
__floatsisf:
beqz $r0, .LKzero ! A is zero
move $r4, #0x80000000
and $r2, $r0, $r4 ! sign(A)
beqz $r2, .LKcont
subri $r0, $r0, #0
! abs(A)
.LKcont:
move EXPOA, #0x9e
move $r5, 16
move $r3, 0
.LKloop:
add $r3, $r3, $r5
srl $r15, MANTA, $r3
bnez $r15, .LKloop2
sll MANTA, MANTA, $r5
sub EXPOA, EXPOA, $r5
.LKloop2:
srli $r5, $r5, #1
bnez $r5, .LKloop
! do rounding
srli $r4, $r4, #24 ! 0x80
add MANTA, MANTA, $r4
slt $r15, MANTA, $r4
add EXPOA, EXPOA, $r15
srai $r4, MANTA, #8
andi $r4, $r4, #1
sub MANTA, MANTA, $r4
slli MANTA, MANTA, #1 ! shift out implied 1
! pack
srli MANTA, MANTA, #9
slli $r4, EXPOA, #23
or $r0, MANTA, $r4
or $r0, $r0, $r2
.LKzero:
ret5 $lp
.size __floatsisf, .-__floatsisf
#undef EXPOA
#undef MANTA
#define VALUA $r1
#define EXPOA VALUA
#define MANTA $r2
#define W0 $r4
#define W1 $r5
.text
.align 2
.global __fixsfsi
.type __fixsfsi, @function
__fixsfsi:
slli VALUA, $r0, #1
slli MANTA, VALUA, #7
srli EXPOA, VALUA, #24
subri EXPOA, EXPOA, #0x9e
move W1, #0x80000000
blez EXPOA, .LJover ! number is too big
sltsi $r15, EXPOA, #0x20
beqz $r15, .LJzero ! number is too small
or MANTA, MANTA, W1
srl MANTA, MANTA, EXPOA
sltsi $r15, $r0, #0
subri $r0, MANTA, #0
cmovz $r0, MANTA, $r15
ret5 $lp
.LJzero:
move $r0, #0
ret5 $lp
.LJover:
move W0, #0x7f800000
slt $r15, W0, $r0
beqzs8 .LJnan
move $r0, W1
ret5 $lp
.LJnan:
addi $r0, W1, -1
ret5 $lp
.size __fixsfsi, .-__fixsfsi
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