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81db61a2e6
and generalize it so that it can be used by IndVarSimplify. Implement the base IndVarSimplify transformation code using IVUsers. This removes TestOrigIVForWrap and associated code, as ScalarEvolution now has enough builtin overflow detection and folding logic to handle all the same cases, and more. Run "opt -iv-users -analyze -disable-output" on your favorite loop for an example of what IVUsers does. This lets IndVarSimplify eliminate IV casts and compute trip counts in more cases. Also, this happens to finally fix the remaining testcases in PR1301. Now that IndVarSimplify is being more aggressive, it occasionally runs into the problem where ScalarEvolutionExpander's code for avoiding duplicate expansions makes it difficult to ensure that all expanded instructions dominate all the instructions that will use them. As a temporary measure, IndVarSimplify now uses a FixUsesBeforeDefs function to fix up instructions inserted by SCEVExpander. Fortunately, this code is contained, and can be easily removed once a more comprehensive solution is available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71535 91177308-0d34-0410-b5e6-96231b3b80d8
91 lines
2.9 KiB
LLVM
91 lines
2.9 KiB
LLVM
; RUN: llvm-as < %s | opt -indvars | llvm-dis > %t
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; RUN: grep phi %t | count 4
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; RUN: grep {= phi i32} %t | count 4
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; RUN: not grep {sext i} %t
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; RUN: not grep {zext i} %t
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; RUN: not grep {trunc i} %t
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; RUN: not grep {add i8} %t
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; PR1301
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; Do a bunch of analysis and prove that the loops can use an i32 trip
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; count without casting.
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; ModuleID = 'ada.bc'
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64"
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target triple = "i686-pc-linux-gnu"
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define void @kinds__sbytezero([256 x i32]* nocapture %a) nounwind {
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bb.thread:
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%tmp46 = getelementptr [256 x i32]* %a, i32 0, i32 0 ; <i32*> [#uses=1]
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store i32 0, i32* %tmp46
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br label %bb
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bb: ; preds = %bb, %bb.thread
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%i.0.reg2mem.0 = phi i8 [ -128, %bb.thread ], [ %tmp8, %bb ] ; <i8> [#uses=1]
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%tmp8 = add i8 %i.0.reg2mem.0, 1 ; <i8> [#uses=3]
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%tmp1 = sext i8 %tmp8 to i32 ; <i32> [#uses=1]
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%tmp3 = add i32 %tmp1, 128 ; <i32> [#uses=1]
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%tmp4 = getelementptr [256 x i32]* %a, i32 0, i32 %tmp3 ; <i32*> [#uses=1]
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store i32 0, i32* %tmp4
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%0 = icmp eq i8 %tmp8, 127 ; <i1> [#uses=1]
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br i1 %0, label %return, label %bb
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return: ; preds = %bb
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ret void
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}
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define void @kinds__ubytezero([256 x i32]* nocapture %a) nounwind {
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bb.thread:
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%tmp35 = getelementptr [256 x i32]* %a, i32 0, i32 0 ; <i32*> [#uses=1]
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store i32 0, i32* %tmp35
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br label %bb
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bb: ; preds = %bb, %bb.thread
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%i.0.reg2mem.0 = phi i8 [ 0, %bb.thread ], [ %tmp7, %bb ] ; <i8> [#uses=1]
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%tmp7 = add i8 %i.0.reg2mem.0, 1 ; <i8> [#uses=3]
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%tmp1 = zext i8 %tmp7 to i32 ; <i32> [#uses=1]
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%tmp3 = getelementptr [256 x i32]* %a, i32 0, i32 %tmp1 ; <i32*> [#uses=1]
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store i32 0, i32* %tmp3
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%0 = icmp eq i8 %tmp7, -1 ; <i1> [#uses=1]
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br i1 %0, label %return, label %bb
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return: ; preds = %bb
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ret void
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}
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define void @kinds__srangezero([21 x i32]* nocapture %a) nounwind {
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bb.thread:
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br label %bb
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bb: ; preds = %bb, %bb.thread
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%i.0.reg2mem.0 = phi i8 [ -10, %bb.thread ], [ %tmp7, %bb ] ; <i8> [#uses=2]
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%tmp12 = sext i8 %i.0.reg2mem.0 to i32 ; <i32> [#uses=1]
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%tmp4 = add i32 %tmp12, 10 ; <i32> [#uses=1]
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%tmp5 = getelementptr [21 x i32]* %a, i32 0, i32 %tmp4 ; <i32*> [#uses=1]
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store i32 0, i32* %tmp5
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%tmp7 = add i8 %i.0.reg2mem.0, 1 ; <i8> [#uses=2]
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%0 = icmp sgt i8 %tmp7, 10 ; <i1> [#uses=1]
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br i1 %0, label %return, label %bb
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return: ; preds = %bb
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ret void
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}
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define void @kinds__urangezero([21 x i32]* nocapture %a) nounwind {
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bb.thread:
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br label %bb
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bb: ; preds = %bb, %bb.thread
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%i.0.reg2mem.0 = phi i8 [ 10, %bb.thread ], [ %tmp7, %bb ] ; <i8> [#uses=2]
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%tmp12 = sext i8 %i.0.reg2mem.0 to i32 ; <i32> [#uses=1]
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%tmp4 = add i32 %tmp12, -10 ; <i32> [#uses=1]
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%tmp5 = getelementptr [21 x i32]* %a, i32 0, i32 %tmp4 ; <i32*> [#uses=1]
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store i32 0, i32* %tmp5
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%tmp7 = add i8 %i.0.reg2mem.0, 1 ; <i8> [#uses=2]
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%0 = icmp sgt i8 %tmp7, 30 ; <i1> [#uses=1]
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br i1 %0, label %return, label %bb
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return: ; preds = %bb
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ret void
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}
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