search for: sub64rr

...to fix this problem. My comments delimited with #####. The rest is llvm debug output (lots of stuff added by me so you won't get the same output with upstream llvm -debug). ##### There's a sequence of instructions that looks like this before linear scan: ##### 2800 %reg1591<def> = SUB64rr %reg1591, %reg1589, %EFLAGS<imp-def,dead> ; srcLine 0 2808 %reg1591<def> = IMUL64rr %reg1591, %reg1055, %EFLAGS<imp-def,dead> ; srcLine 0 2816 %reg1591<def> = ADD64rr %reg1591, %reg1579, %EFLAGS<imp-def,dead> ; srcLine 0 2820 %reg1198<def> = LEA64r %reg1591...

...> = SUB64ri32 %RDX<tied0>, 4096, %EFLAGS<imp-def>; flags: FrameSetup JAE_1 <BB#1>, %EFLAGS<imp-use>; flags: FrameSetup Successors according to CFG: BB#2 BB#1 BB#2: derived from LLVM BB %0 Predecessors according to CFG: BB#1 %RSP<def,tied1> = SUB64rr %RSP<tied0>, %RAX, %EFLAGS<imp-def>; flags: FrameSetup SEH_StackAlloc 40040; flags: FrameSetup SEH_EndPrologue; flags: FrameSetup %RCX<def> = LEA64r %RSP, 1, %noreg, 40, %noreg %EDX<def> = MOV32r0 %EFLAGS<imp-def,dead> CALL64pcre...

On Tue, Jul 28, 2015 at 6:34 PM, Reid Kleckner <rnk at google.com> wrote: > On Tue, Jul 28, 2015 at 2:25 AM, John Kåre Alsaker > <john.mailinglists at gmail.com> wrote: >> >> On Tue, Jul 28, 2015 at 12:44 AM, Reid Kleckner <rnk at google.com> wrote: >> > Yeah, the function attributes section of LangRef is a reasonable place >> > to >>

...en adjusting %rsp. - if (isSPUpdateNeeded) { + if (Is64Bit) { + // MSVC x64's __chkstk and cygwin/mingw's ___chkstk_ms do not adjust %rsp + // themself. It also does not clobber %rax so we can reuse it when + // adjusting %rsp. BuildMI(MBB, MBBI, DL, TII.get(X86::SUB64rr), StackPtr) .addReg(StackPtr) .addReg(X86::RAX) .setMIFlag(MachineInstr::FrameSetup); } - if (isEAXAlive) { // Restore EAX MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm), diff --git a/test/CodeGen/X86/win64_alloca_dynallo...

Mingw switched abis with the release of gcc 4.7 (http://gcc.gnu.org/gcc-4.7/changes.html). The main change is that now mingw (like msvc) given thiscall calling convention to methods by default. I think the last bug blocking us to support the new abi has just been fixed. The question now is how to switch. The attached patches simply switch llvm and clang to the new ABI. This is similar to what