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2012-11-07Only do switch-to-lookup table transformation when TargetTransformInfoHans Wennborg
is available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167552 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-06Build lookup tables for switches (PR884)Hans Wennborg
This adds a transformation to SimplifyCFG that attemps to turn switch instructions into loads from lookup tables. It works on switches that are only used to initialize one or more phi nodes in a common successor basic block, for example: int f(int x) { switch (x) { case 0: return 5; case 1: return 4; case 2: return -2; case 5: return 7; case 6: return 9; default: return 42; } This speeds up the code by removing the hard-to-predict jump, and reduces code size by removing the code for the jump targets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163302 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-02Revert "IntRange:" as it appears to be breaking self hosting.Eric Christopher
This reverts commit b2833d9dcba88c6f0520cad760619200adc0442c. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159618 91177308-0d34-0410-b5e6-96231b3b80d8
2012-07-02IntRange:Stepan Dyatkovskiy
- Changed isSingleNumber method behaviour. Now this flag is calculated on demand. IntegersSubsetMapping - Optimized diff operation. - Replaced type of Items field from std::list with std::map. - Added new methods: bool isOverlapped(self &RHS) void add(self& RHS, SuccessorClass *S) void detachCase(self& NewMapping, SuccessorClass *Succ) void removeCase(SuccessorClass *Succ) SuccessorClass *findSuccessor(const IntTy& Val) const IntTy* getCaseSingleNumber(SuccessorClass *Succ) IntegersSubsetTest - DiffTest: Added checks for successors. SimplifyCFG Updated SwitchInst usage (now it is case-ragnes compatible) for - SimplifyEqualityComparisonWithOnlyPredecessor - FoldValueComparisonIntoPredecessors git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159527 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-07SimplifyCFG: Track the number of used icmps when turning a icmp chain into a ↵Benjamin Kramer
switch. If we used only one icmp, don't turn it into a switch. Also prevent the switch-to-icmp transform from creating identity adds, noticed by Marius Wachtler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125056 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-02SimplifyCFG: Turn switches into sub+icmp+branch if possible.Benjamin Kramer
This makes the job of the later optzn passes easier, allowing the vast amount of icmp transforms to chew on it. We transform 840 switches in gcc.c, leading to a 16k byte shrink of the resulting binary on i386-linux. The testcase from README.txt now compiles into decl %edi cmpl $3, %edi sbbl %eax, %eax andl $1, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124724 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Re-apply r124518 with fix. Watch out for invalidated iterator.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124526 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Revert r124518. It broke Linux self-host.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124522 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-29Re-commit r124462 with fixes. Tail recursion elim will now dup ret into ↵Evan Cheng
unconditional predecessor to enable TCE on demand. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124518 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28Revert r124462. There are a few big regressions that I need to fix first.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124478 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-28- Stop simplifycfg from duplicating "ret" instructions into unconditionalEvan Cheng
branches. PR8575, rdar://5134905, rdar://8911460. - Allow codegen tail duplication to dup small return blocks after register allocation is done. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124462 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17SimplifyCFG: Ranges can be larger than 64 bits. Fixes Release-selfhost build.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122054 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-17improve switch formation to handle small range Chris Lattner
comparisons formed by comparisons. For example, this: void foo(unsigned x) { if (x == 0 || x == 1 || x == 3 || x == 4 || x == 6) bar(); } compiles into: _foo: ## @foo ## BB#0: ## %entry cmpl $6, %edi ja LBB0_2 ## BB#1: ## %entry movl %edi, %eax movl $91, %ecx btq %rax, %rcx jb LBB0_3 instead of: _foo: ## @foo ## BB#0: ## %entry cmpl $2, %edi jb LBB0_4 ## BB#1: ## %switch.early.test cmpl $6, %edi ja LBB0_3 ## BB#2: ## %switch.early.test movl %edi, %eax movl $88, %ecx btq %rax, %rcx jb LBB0_4 This catches a bunch of cases in GCC, which look like this: %804 = load i32* @which_alternative, align 4, !tbaa !0 %805 = icmp ult i32 %804, 2 %806 = icmp eq i32 %804, 3 %or.cond121 = or i1 %805, %806 %807 = icmp eq i32 %804, 4 %or.cond124 = or i1 %or.cond121, %807 br i1 %or.cond124, label %.thread, label %808 turning this into a range comparison. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122045 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14 - Insert new instructions before DomBlock's terminator,Chris Lattner
which is simpler than finding a place to insert in BB. - Don't perform the 'if condition hoisting' xform on certain i1 PHIs, as it interferes with switch formation. This re-fixes "example 7", without breaking the world hopefully. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121764 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14fix yet anohter broken lineChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121750 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-14reapply my recent change that disables a piece of the switch formationChris Lattner
work, but fixes 400.perlbmk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121749 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Fix recent buildbot breakage by pulling SimplifyCFG back to its state as of ↵Owen Anderson
r121694, the most recent state where I'm confident there were no crashes or miscompilations. XFAIL the test added since then for now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121733 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13temporarily disable part of my previous patch, which causes an iterator ↵Chris Lattner
invalidation issue, causing a crash on some versions of perlbmk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121728 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Fix sort predicate. qsort(3)'s predicate semantics differ from std::sort's. ↵Benjamin Kramer
Fixes PR 8780. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121705 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13reinstate my patch: the miscompile was caused by an inverted branch in theChris Lattner
'and' case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121695 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Completely disable the optimization I added in r121680 untilChris Lattner
I can track down a miscompile. This should bring the buildbots back to life git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121693 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Make simplifycfg reprocess newly formed "br (cond1 | cond2)" conditionsChris Lattner
when simplifying, allowing them to be eagerly turned into switches. This is the last step required to get "Example 7" from this blog post: http://blog.regehr.org/archives/320 On X86, we now generate this machine code, which (to my eye) seems better than the ICC generated code: _crud: ## @crud ## BB#0: ## %entry cmpb $33, %dil jb LBB0_4 ## BB#1: ## %switch.early.test addb $-34, %dil cmpb $58, %dil ja LBB0_3 ## BB#2: ## %switch.early.test movzbl %dil, %eax movabsq $288230376537592865, %rcx ## imm = 0x400000017001421 btq %rax, %rcx jb LBB0_4 LBB0_3: ## %lor.rhs xorl %eax, %eax ret LBB0_4: ## %lor.end movl $1, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121690 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13fix a bug in r121680 that upset the various buildbots.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121687 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13enhance the "change or icmp's into switch" xform to handle one value in an Chris Lattner
'or sequence' that it doesn't understand. This allows us to optimize something insane like this: int crud (unsigned char c, unsigned x) { if(((((((((( (int) c <= 32 || (int) c == 46) || (int) c == 44) || (int) c == 58) || (int) c == 59) || (int) c == 60) || (int) c == 62) || (int) c == 34) || (int) c == 92) || (int) c == 39) != 0) foo(); } into: define i32 @crud(i8 zeroext %c, i32 %x) nounwind ssp noredzone { entry: %cmp = icmp ult i8 %c, 33 br i1 %cmp, label %if.then, label %switch.early.test switch.early.test: ; preds = %entry switch i8 %c, label %if.end [ i8 39, label %if.then i8 44, label %if.then i8 58, label %if.then i8 59, label %if.then i8 60, label %if.then i8 62, label %if.then i8 46, label %if.then i8 92, label %if.then i8 34, label %if.then ] by pulling the < comparison out ahead of the newly formed switch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121680 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13merge two testsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121679 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13Fix my previous patch to handle a degenerate case that the llvm-gccChris Lattner
bootstrap buildbot tripped over. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121674 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-13fix a fairly serious oversight with switch formation fromChris Lattner
or'd conditions. Previously we'd compile something like this: int crud (unsigned char c) { return c == 62 || c == 34 || c == 92; } into: switch i8 %c, label %lor.rhs [ i8 62, label %lor.end i8 34, label %lor.end ] lor.rhs: ; preds = %entry %cmp8 = icmp eq i8 %c, 92 br label %lor.end lor.end: ; preds = %entry, %entry, %lor.rhs %0 = phi i1 [ true, %entry ], [ %cmp8, %lor.rhs ], [ true, %entry ] %lor.ext = zext i1 %0 to i32 ret i32 %lor.ext which failed to merge the compare-with-92 into the switch. With this patch we simplify this all the way to: switch i8 %c, label %lor.rhs [ i8 62, label %lor.end i8 34, label %lor.end i8 92, label %lor.end ] lor.rhs: ; preds = %entry br label %lor.end lor.end: ; preds = %entry, %entry, %entry, %lor.rhs %0 = phi i1 [ true, %entry ], [ false, %lor.rhs ], [ true, %entry ], [ true, %entry ] %lor.ext = zext i1 %0 to i32 ret i32 %lor.ext which is much better for codegen's switch lowering stuff. This kicks in 33 times on 176.gcc (for example) cutting 103 instructions off the generated code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121671 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-11fix a bunch of spurious failures for people whose home directoryChris Lattner
is sabre. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81528 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08Use opt -S instead of piping bitcode output through llvm-dis.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81257 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08Change these tests to feed the assembly files to opt directly, insteadDan Gohman
of using llvm-as, now that opt supports this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81226 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-18Upgrade tests to not use llvm-upgrade.Tanya Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48483 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-02Use the llvm-upgrade program to upgrade llvm assembly.Reid Spencer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32115 91177308-0d34-0410-b5e6-96231b3b80d8
2005-02-24add another testcase to make sure it gets turned into a switch (answer: yes ↵Chris Lattner
it does) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20291 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-24The simplifycfg pass should be able to turn stuff like:Chris Lattner
if (X == 4 || X == 7) and if (X != 4 && X != 7) into switch instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11791 91177308-0d34-0410-b5e6-96231b3b80d8
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