76 lines
1.3 KiB
ArmAsm
76 lines
1.3 KiB
ArmAsm
/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the mingw-w64 runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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#include <_mingw_mac.h>
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.file "ilogbl.S"
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.text
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#ifdef __x86_64__
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.align 8
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#else
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.align 4
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#endif
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.globl __MINGW_USYMBOL(ilogbl)
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.def __MINGW_USYMBOL(ilogbl); .scl 2; .type 32; .endef
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__MINGW_USYMBOL(ilogbl):
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#ifdef __x86_64__
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fldt (%rcx)
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fxam /* Is NaN or +-Inf? */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x05, %dh
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je 1f /* Is +-Inf, jump. */
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cmpb $0x40, %dh
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je 2f /* Is +-Inf, jump. */
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fxtract
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pushq %rax
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fstp %st
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fistpl (%rsp)
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fwait
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popq %rax
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ret
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1: fstp %st
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movl $0x7fffffff, %eax
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ret
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2: fstp %st
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movl $0x80000001, %eax /* FP_ILOGB0 */
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ret
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#else
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fldt 4(%esp)
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/* I added the following ugly construct because ilogb(+-Inf) is
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required to return INT_MAX in ISO C99.
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-- jakub@redhat.com. */
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fxam /* Is NaN or +-Inf? */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x05, %dh
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je 1f /* Is +-Inf, jump. */
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cmpb $0x40, %dh
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je 2f /* Is +-Inf, jump. */
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fxtract
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pushl %eax
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fstp %st
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fistpl (%esp)
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fwait
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popl %eax
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ret
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1: fstp %st
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movl $0x7fffffff, %eax
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ret
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2: fstp %st
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movl $0x80000001, %eax /* FP_ILOGB0 */
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ret
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#endif
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