Chris Lattner f22da20af4 my recent change caused a failure in a bswap testcase, because it changed ... the order that instcombine processed instructions in the testcase. The end result is that instcombine finished with: define i16 @test1(i16 %a) { %tmp = zext i16 %a to i32 ; <i32> [#uses=2] %tmp21 = lshr i32 %tmp, 8 ; <i32> [#uses=1] %tmp5 = shl i32 %tmp, 8 ; <i32> [#uses=1] %tmp.upgrd.32 = or i32 %tmp21, %tmp5 ; <i32> [#uses=1] %tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16 ; <i16> [#uses=1] ret i16 %tmp.upgrd.3 } which can't get matched as a bswap. This patch makes instcombine more sophisticated about removing truncating casts, allowing it to turn this into: define i16 @test2(i16 %a) { %tmp211 = lshr i16 %a, 8 %tmp52 = shl i16 %a, 8 %tmp.upgrd.323 = or i16 %tmp211, %tmp52 ret i16 %tmp.upgrd.323 } which then matches as bswap. This fixes bswap.ll and implements InstCombine/cast2.ll:test[12]. This also implements cast elimination of add/sub. llvm-svn: 34870		2007-03-03 05:27:34 +00:00
..
Hello	eliminate static ctor from example.	2006-12-19 22:24:09 +00:00
Instrumentation	remove reoptimizer-specific passes	2007-02-20 05:31:49 +00:00
IPO	Prefer non-virtual calls to ConstantInt::isZero over virtual calls to	2007-03-02 00:28:52 +00:00
Scalar	my recent change caused a failure in a bswap testcase, because it changed	2007-03-03 05:27:34 +00:00
Utils	Make sure debug code is not evaluated in non-debug case.	2007-03-02 23:15:21 +00:00
Makefile	For PR1072:	2007-02-03 23:15:56 +00:00