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Darwin, like many BSD systems, has a setjmp/longjmp which saves the signal mask

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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
This commit is contained in:
Chris Lattner 2005-09-27 22:18:25 +00:00
parent 6c38b33613
commit d145a61f8f
1 changed files with 3 additions and 0 deletions
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3
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -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);