https://llvm.org/bugs/show_bug.cgi?id=30730
Bug ID: 30730 Summary: use lvx instead of lxvd2x and xxswapd when address is assumed to be aligned Product: libraries Version: trunk Hardware: PC OS: Linux Status: NEW Severity: normal Priority: P Component: Backend: PowerPC Assignee: unassignedb...@nondot.org Reporter: echri...@gmail.com CC: llvm-bugs@lists.llvm.org Classification: Unclassified Power9 has a little endian load here that it can use for unaligned addresses, but for power8 this is still important. --- #include <altivec.h> struct S { vector int v; vector int f() const; }; vector int S::f() const { return v; } --- AltiVec code: .text .abiversion 2 .file "aligned_load.cc" .globl _ZNK1S1fEv .p2align 4 .type _ZNK1S1fEv,@function _ZNK1S1fEv: # @_ZNK1S1fEv .Lfunc_begin0: # BB#0: lvx 2, 0, 3 blr .long 0 .quad 0 .Lfunc_end0: .size _ZNK1S1fEv, .Lfunc_end0-.Lfunc_begin0 --- VSX code .text .abiversion 2 .file "aligned_load.cc" .globl _ZNK1S1fEv .p2align 4 .type _ZNK1S1fEv,@function _ZNK1S1fEv: # @_ZNK1S1fEv .Lfunc_begin0: # BB#0: lxvd2x 0, 0, 3 xxswapd 34, 0 # kill: %V2<def> %V2<kill> %VSH2<kill> blr .long 0 .quad 0 .Lfunc_end0: .size _ZNK1S1fEv, .Lfunc_end0-.Lfunc_begin0 -- You are receiving this mail because: You are on the CC list for the bug.
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