Chris Lattner 3ddcc43040 fix the BuildVector -> unpcklps logic to not do pointless shuffles ... when the top elements of a vector are undefined. This happens all the time for X86-64 ABI stuff because only the low 2 elements of a 4 element vector are defined. For example, on: _Complex float f32(_Complex float A, _Complex float B) { return A+B; } We used to produce (with SSE2, SSE4.1+ uses insertps): _f32: ## @f32 movdqa %xmm0, %xmm2 addss %xmm1, %xmm2 pshufd $16, %xmm2, %xmm2 pshufd $1, %xmm1, %xmm1 pshufd $1, %xmm0, %xmm0 addss %xmm1, %xmm0 pshufd $16, %xmm0, %xmm1 movdqa %xmm2, %xmm0 unpcklps %xmm1, %xmm0 ret We now produce: _f32: ## @f32 movdqa %xmm0, %xmm2 addss %xmm1, %xmm2 pshufd $1, %xmm1, %xmm1 pshufd $1, %xmm0, %xmm3 addss %xmm1, %xmm3 movaps %xmm2, %xmm0 unpcklps %xmm3, %xmm0 ret This implements rdar://8368414 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112378 91177308-0d34-0410-b5e6-96231b3b80d8		2010-08-28 17:28:30 +00:00
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Analysis	Fix an index calculation thinko.	2010-08-28 00:39:27 +00:00
Archive
AsmParser	remove unions from LLVM IR. They are severely buggy and not	2010-08-28 04:09:24 +00:00
Bitcode	remove unions from LLVM IR. They are severely buggy and not	2010-08-28 04:09:24 +00:00
CodeGen	remove unions from LLVM IR. They are severely buggy and not	2010-08-28 04:09:24 +00:00
CompilerDriver
ExecutionEngine
Linker
MC	squish dead code.	2010-08-28 03:21:03 +00:00
Support	StringRef::compare_numeric also differed from StringRef::compare for characters > 127.	2010-08-26 15:25:35 +00:00
System	Don't cast Win32 FILETIME structs to int64. Patch by Dimitry Andric!	2010-08-28 16:39:32 +00:00
Target	fix the BuildVector -> unpcklps logic to not do pointless shuffles	2010-08-28 17:28:30 +00:00
Transforms	remove unions from LLVM IR. They are severely buggy and not	2010-08-28 04:09:24 +00:00
VMCore	remove unions from LLVM IR. They are severely buggy and not	2010-08-28 04:09:24 +00:00
Makefile