forked from OSchip/llvm-project
40 lines
1.2 KiB
ArmAsm
40 lines
1.2 KiB
ArmAsm
//===-- floatundidf.s - Implement __floatundidf for x86_64 ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements __floatundidf for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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// double __floatundidf(du_int a);
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#ifdef __x86_64__
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.const
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.align 4
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twop52: .quad 0x4330000000000000
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twop84_plus_twop52:
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.quad 0x4530000000100000
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twop84: .quad 0x4530000000000000
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#define REL_ADDR(_a) (_a)(%rip)
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.text
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.align 4
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.globl ___floatundidf
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___floatundidf:
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movd %edi, %xmm0 // low 32 bits of a
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shrq $32, %rdi // high 32 bits of a
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orq REL_ADDR(twop84), %rdi // 0x1p84 + a_hi (no rounding occurs)
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orpd REL_ADDR(twop52), %xmm0 // 0x1p52 + a_lo (no rounding occurs)
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movd %rdi, %xmm1
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subsd REL_ADDR(twop84_plus_twop52), %xmm1 // a_hi - 0x1p52 (no rounding occurs)
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addsd %xmm1, %xmm0 // a_hi + a_lo (round happens here)
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ret
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#endif // __x86_64__ |