4fe342cb75
Today Polly generates induction variable in this way: polly.indvar = phi 0, polly.indvar.next ... polly.indvar.next = polly.indvar + stide polly.loop_cond = predicate polly.indvar, (UB - stride) Instead of: polly.indvar = phi 0, polly.indvar.next ... polly.indvar.next = polly.indvar + stide polly.loop_cond = predicate polly.indvar.next, UB The way Polly generate induction variable cause some problem in the indvar simplify pass. This patch make polly generate the later form, by assuming the induction variable never overflow Differential Revision: https://reviews.llvm.org/D33089 llvm-svn: 302866
57 lines
1.8 KiB
LLVM
57 lines
1.8 KiB
LLVM
; RUN: opt %loadPolly -polly-ast -analyze < %s | FileCheck %s
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; RUN: opt %loadPolly -polly-codegen -S < %s | FileCheck %s -check-prefix=CODEGEN
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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@A = common global [1024 x i32] zeroinitializer
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define void @bar(i64 %n) {
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start:
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fence seq_cst
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br label %loop.header
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loop.header:
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%i = phi i64 [ 0, %start ], [ %i.next, %loop.backedge ]
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%scevgep = getelementptr [1024 x i32], [1024 x i32]* @A, i64 0, i64 %i
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%exitcond = icmp ne i64 %i, %n
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br i1 %exitcond, label %loop.body, label %ret
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loop.body:
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store i32 1, i32* %scevgep
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br label %loop.backedge
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loop.backedge:
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%i.next = add nsw i64 %i, 1
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br label %loop.header
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ret:
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fence seq_cst
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ret void
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}
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; CHECK: for (int c0 = 0; c0 < n; c0 += 1)
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; CHECK: Stmt_loop_body(c0)
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; CODEGEN: polly.start:
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; CODEGEN: br label %polly.loop_if
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; CODEGEN: polly.loop_exit:
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; CODEGEN: br label %polly.merge_new_and_old
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; CODEGEN: polly.loop_if:
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; CODEGEN: %polly.loop_guard = icmp slt i64 0, %n
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; CODEGEN: br i1 %polly.loop_guard, label %polly.loop_preheader, label %polly.loop_exit
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; CODEGEN: polly.loop_header:
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; CODEGEN: %polly.indvar = phi i64 [ 0, %polly.loop_preheader ], [ %polly.indvar_next, %polly.stmt.loop.body ]
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; CODEGEN: br label %polly.stmt.loop.body
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; CODEGEN: polly.stmt.loop.body:
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; CODEGEN: [[PTR:%[a-zA-Z0-9_\.]+]] = getelementptr [1024 x i32], [1024 x i32]* @A, i64 0, i64 %polly.indvar
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; CODEGEN: store i32 1, i32* [[PTR]]
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; CODEGEN: %polly.indvar_next = add nsw i64 %polly.indvar, 1
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; CODEGEN: %polly.loop_cond = icmp slt i64 %polly.indvar_next, %n
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; CODEGEN: br i1 %polly.loop_cond, label %polly.loop_header, label %polly.loop_exit
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; CODEGEN: polly.loop_preheader:
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; CODEGEN: br label %polly.loop_header
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