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int foo1(int x, int y) { int t1 = x >= 0; int t2 = y >= 0; return t1 & t2; } int foo2(int x, int y) { int t1 = x == -1; int t2 = y == -1; return t1 & t2; } produces: _foo1: or r2, r4, r3 srwi r2, r2, 31 xori r3, r2, 1 blr _foo2: and r2, r4, r3 addic r2, r2, 1 li r2, 0 addze r3, r2 blr instead of: _foo1: srwi r2, r4, 31 xori r2, r2, 1 srwi r3, r3, 31 xori r3, r3, 1 and r3, r2, r3 blr _foo2: addic r2, r4, 1 li r2, 0 addze r2, r2 addic r3, r3, 1 li r3, 0 addze r3, r3 and r3, r2, r3 blr llvm-svn: 21547 |
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