-enable-iv-rewrite is neither supported nor needed with LLVM now.
The one case where it was a big win was partially an inliner bug and the changes to the inline cost estimate are much smaller over all.
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@ -1,4 +1,4 @@
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# $NetBSD: Makefile.inc,v 1.9 2011/12/11 14:59:24 joerg Exp $
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# $NetBSD: Makefile.inc,v 1.10 2012/04/04 10:54:44 joerg Exp $
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.include <bsd.own.mk>
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@ -7,6 +7,5 @@ BINDIR= /usr/mdec
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OPT_SIZE.gcc= -Os -ffreestanding -fomit-frame-pointer
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OPT_SIZE.clang= -Oz -ffreestanding -fomit-frame-pointer -DNDEBUG \
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-fno-stack-protector -mno-sse \
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-mllvm -enable-iv-rewrite=true \
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-mstack-alignment=4 \
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-mllvm -inline-threshold=3 -mllvm -enable-load-pre=false
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