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186.crafty, fhourstones and 132.ijpeg. Bugpoint makes really nasty miscompilations embarassingly easy to find. It narrowed it down to the instcombiner and this testcase (from fhourstones): bool %l7153_l4706_htstat_loopentry_2E_4_no_exit_2E_4(int* %i, [32 x int]* %works, int* %tmp.98.out) { newFuncRoot: %tmp.96 = load int* %i ; <int> [#uses=1] %tmp.97 = getelementptr [32 x int]* %works, long 0, int %tmp.96 ; <int*> [#uses=1] %tmp.98 = load int* %tmp.97 ; <int> [#uses=2] %tmp.99 = load int* %i ; <int> [#uses=1] %tmp.100 = and int %tmp.99, 7 ; <int> [#uses=1] %tmp.101 = seteq int %tmp.100, 7 ; <bool> [#uses=2] %tmp.102 = cast bool %tmp.101 to int ; <int> [#uses=0] br bool %tmp.101, label %codeRepl4.exitStub, label %codeRepl3.exitStub codeRepl4.exitStub: ; preds = %newFuncRoot store int %tmp.98, int* %tmp.98.out ret bool true codeRepl3.exitStub: ; preds = %newFuncRoot store int %tmp.98, int* %tmp.98.out ret bool false } ... which only has one combination performed on it: $ llvm-as < t.ll | opt -instcombine -debug | llvm-dis IC: Old = %tmp.101 = seteq int %tmp.100, 7 ; <bool> [#uses=1] New = setne int %tmp.100, 0 ; <bool>:<badref> [#uses=0] IC: MOD = br bool %tmp.101, label %codeRepl3.exitStub, label %codeRepl4.exitStub IC: MOD = %tmp.97 = getelementptr [32 x int]* %works, uint 0, int %tmp.96 ; <int*> [#uses=1] It doesn't get much better than this. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14109 91177308-0d34-0410-b5e6-96231b3b80d8 |
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