#7684: cgrun071 segfaults ----------------------------------+---------------------------------- Reporter: tibbe | Owner: Type: bug | Status: infoneeded Priority: normal | Milestone: 7.8.1 Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 (amd64) Type of failure: Runtime crash | Difficulty: Unknown Test Case: cgrun071 | Blocked By: Blocking: | Related Tickets: ----------------------------------+---------------------------------- Comment (by tibbe): Now I'm confused. Both GCC 4.2 (apple-gcc42 from Homebrew) and GCC 4.9 create the correctly zero extended code for `hs_popcnt8`: GCC 4.2 {{{ #!asm _hs_popcnt8: LFB112: pushq %rbp LCFI0: movq %rsp, %rbp LCFI1: movzbl %dil, %edi leaq _popcount_tab(%rip), %rax movzbl (%rdi,%rax), %eax leave ret }}} GCC 4.9: {{{ #!asm _hs_popcnt8: LFB110: leaq _popcount_tab(%rip), %rax movzbl %dil, %edi movzbl (%rax,%rdi), %eax ret }}} Exact GCC versions: {{{ $ gcc-4.2 --version i686-apple-darwin11-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3) ... $ gcc-4.9 --version gcc-4.9 (GCC) 4.9.0 20140223 (experimental) ... }}} Perhaps this bug was fixed in some release of GCC 4.2? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7684#comment:48 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler