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llvm-project/llvm/test/CodeGen/X86/combine-lds.ll

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For whatever the reason, x86 CallingConv::Fast (i.e. fastcc) was not passing scalar arguments in registers. This patch defines a new fastcc CC which is slightly different from the FastCall CC. In addition to passing integer arguments in ECX and EDX, it also specify doubles are passed in 8-byte slots which are 8-byte aligned (instead of 4-byte aligned). This avoids a potential performance hazard where doubles span cacheline boundaries. llvm-svn: 55807
2008-09-05 06:59:58 +08:00
; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 | grep fldl | count 1
Xform bitconvert(build_pair(load a, load b)) to a single load if the load locations are at the right offset from each other. llvm-svn: 51008
2008-05-13 07:04:07 +08:00
For whatever the reason, x86 CallingConv::Fast (i.e. fastcc) was not passing scalar arguments in registers. This patch defines a new fastcc CC which is slightly different from the FastCall CC. In addition to passing integer arguments in ECX and EDX, it also specify doubles are passed in 8-byte slots which are 8-byte aligned (instead of 4-byte aligned). This avoids a potential performance hazard where doubles span cacheline boundaries. llvm-svn: 55807
2008-09-05 06:59:58 +08:00
define double @doload64(i64 %x) nounwind {
Xform bitconvert(build_pair(load a, load b)) to a single load if the load locations are at the right offset from each other. llvm-svn: 51008
2008-05-13 07:04:07 +08:00
%tmp717 = bitcast i64 %x to double
ret double %tmp717
}