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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29215 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -709,3 +709,28 @@ Use cpuid to auto-detect CPU features such as SSE, SSE2, and SSE3.
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JIT should resolve __cxa_atexit on Mac OS X. In a non-jit environment, the
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symbol is a dynamically resolved by the linker.
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//===---------------------------------------------------------------------===//
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u32 to float conversion improvement:
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float uint32_2_float( unsigned u ) {
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float fl = (int) (u & 0xffff);
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float fh = (int) (u >> 16);
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fh *= 0x1.0p16f;
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return fh + fl;
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}
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00000000 subl $0x04,%esp
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00000003 movl 0x08(%esp,1),%eax
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00000007 movl %eax,%ecx
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00000009 shrl $0x10,%ecx
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0000000c cvtsi2ss %ecx,%xmm0
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00000010 andl $0x0000ffff,%eax
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00000015 cvtsi2ss %eax,%xmm1
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00000019 mulss 0x00000078,%xmm0
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00000021 addss %xmm1,%xmm0
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00000025 movss %xmm0,(%esp,1)
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0000002a flds (%esp,1)
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0000002d addl $0x04,%esp
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00000030 ret
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