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New testcases to ensure sub's are maximally reassociable
llvm-svn: 2633
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; With sub reassociation, constant folding can eliminate all of the constants.
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;
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; RUN: if as < %s | opt -reassociate -constprop -instcombine -dce | dis | grep add
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; RUN: then exit 1
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; RUN: else exit 0
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; RUN: fi
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int "test"(int %A, int %B) {
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%W = add int -5, %B
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%X = add int -7, %A
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%Y = sub int %X, %W
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%Z = add int %Y, 12
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ret int %Z
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}
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; With sub reassociation, constant folding can eliminate the two 12 constants.
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;
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; RUN: if as < %s | opt -reassociate -constprop -dce | dis | grep 12
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; RUN: then exit 1
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; RUN: else exit 0
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; RUN: fi
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int "test"(int %A, int %B, int %C, int %D) {
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%M = add int %A, 12
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%N = add int %M, %B
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%O = add int %N, %C
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%P = sub int %D, %O
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%Q = add int %P, 12
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ret int %Q
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}
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