From d145a61f8f581cfe7dc7abb023a3b1ab534606c7 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 27 Sep 2005 22:18:25 +0000 Subject: [PATCH] Darwin, like many BSD systems, has a setjmp/longjmp which saves the signal mask on setjmp calls and restores it on longjmp calls (both of which require syscalls). This makes the calls REALLY slow. Use _setjmp/_longjmp instead. This speeds up hexxagon from 120.31s to 15.68s: from 5.53x slower than GCC to 28% faster than GCC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23482 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/PowerPC/PPCISelLowering.cpp | 3 +++ 1 file changed, 3 insertions(+) diff --git a/lib/Target/PowerPC/PPCISelLowering.cpp b/lib/Target/PowerPC/PPCISelLowering.cpp index a6831b024f6..f3b7f64f191 100644 --- a/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/lib/Target/PowerPC/PPCISelLowering.cpp @@ -28,6 +28,9 @@ PPC32TargetLowering::PPC32TargetLowering(TargetMachine &TM) // Fold away setcc operations if possible. setSetCCIsExpensive(); + // Use _setjmp/_longjmp instead of setjmp/longjmp. + setUseUnderscoreSetJmpLongJmp(true); + // Set up the register classes. addRegisterClass(MVT::i32, PPC32::GPRCRegisterClass); addRegisterClass(MVT::f32, PPC32::FPRCRegisterClass); -- 2.34.1