pengfei added a comment. Hi @rnk , mine is Phoebe#3036. I haven't really used it before. No sure if I invited you correctly, so I try to explain here.
> My comment here refers to the alignment of argument values, not user-declared > variables. The frontend controls the alignment of user-declared variables by > setting the alloca alignment. Sure. We have the same goal :) > GCC and ICC appear to align long double arguments to 4 bytes: > https://gcc.godbolt.org/z/PbobWdrPf Unfortunately, compiler explorer doesn't provide the Windows version ICC. And the alignment on Windows is different from Linux for ICC. Here are my local result: > cat ex5.cpp void escape(void*); void foo(int x, long double d, int y) { escape(&x); escape(&d); escape(&y); } > icl -c ex5.cpp /Qlong-double /Qpc80 > dumpbin.exe /disasm ex5.obj Microsoft (R) COFF/PE Dumper Version 14.29.30133.0 Copyright (C) Microsoft Corporation. All rights reserved. Dump of file ex5.obj File Type: COFF OBJECT ?foo@@YAXH_TH@Z (void __cdecl foo(int,decltype(auto),int)): 00000000: 8D 44 24 04 lea eax,[esp+4] 00000004: 50 push eax 00000005: E8 00 00 00 00 call ?escape@@YAXPAX@Z 0000000A: 8D 44 24 18 lea eax,[esp+18h] 0000000E: 50 push eax 0000000F: E8 00 00 00 00 call ?escape@@YAXPAX@Z 00000014: 8D 44 24 2C lea eax,[esp+2Ch] 00000018: 50 push eax 00000019: E8 00 00 00 00 call ?escape@@YAXPAX@Z 0000001E: 83 C4 0C add esp,0Ch 00000021: C3 ret 00000022: 0F 1F 80 00 00 00 nop dword ptr [eax] 00 00000029: 0F 1F 80 00 00 00 nop dword ptr [eax] 00 Summary B7 .drectve 30 .text As you can see, the `x` and `d` has 16 bytes distance. I realized I should have put the result earlier to avoid the ambiguity. Sorry for the inconvenience! Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D115441/new/ https://reviews.llvm.org/D115441 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
