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5e06a05a16
have trouble with an intermediate add overflowing. Also, be more conservative about the case where the induction variable in an SLT loop exit can step past the RHS of the SLT and overflow in a single step. Make getSignedRange more aggressive, to recover for some common cases which the above fixes pessimized. This addresses rdar://7561161. llvm-svn: 94512
78 lines
3.2 KiB
LLVM
78 lines
3.2 KiB
LLVM
; RUN: opt < %s -S -analyze -scalar-evolution -disable-output | FileCheck %s
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; ScalarEvolution should be able to fold away the sign-extensions
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; on this loop with a primary induction variable incremented with
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; a nsw add of 2.
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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"
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define void @foo(i32 %no, double* nocapture %d, double* nocapture %q) nounwind {
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entry:
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%n = and i32 %no, 4294967294
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%0 = icmp sgt i32 %n, 0 ; <i1> [#uses=1]
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br i1 %0, label %bb.nph, label %return
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bb.nph: ; preds = %entry
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br label %bb
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bb: ; preds = %bb.nph, %bb1
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%i.01 = phi i32 [ %16, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=5]
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; CHECK: %1 = sext i32 %i.01 to i64
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; CHECK: --> {0,+,2}<%bb>
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%1 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
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; CHECK: %2 = getelementptr inbounds double* %d, i64 %1
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; CHECK: --> {%d,+,16}<%bb>
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%2 = getelementptr inbounds double* %d, i64 %1 ; <double*> [#uses=1]
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%3 = load double* %2, align 8 ; <double> [#uses=1]
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%4 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
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%5 = getelementptr inbounds double* %q, i64 %4 ; <double*> [#uses=1]
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%6 = load double* %5, align 8 ; <double> [#uses=1]
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%7 = or i32 %i.01, 1 ; <i32> [#uses=1]
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; CHECK: %8 = sext i32 %7 to i64
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; CHECK: --> {1,+,2}<%bb>
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%8 = sext i32 %7 to i64 ; <i64> [#uses=1]
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; CHECK: %9 = getelementptr inbounds double* %q, i64 %8
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; CHECK: {(8 + %q),+,16}<%bb>
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%9 = getelementptr inbounds double* %q, i64 %8 ; <double*> [#uses=1]
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; Artificially repeat the above three instructions, this time using
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; add nsw instead of or.
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%t7 = add nsw i32 %i.01, 1 ; <i32> [#uses=1]
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; CHECK: %t8 = sext i32 %t7 to i64
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; CHECK: --> {1,+,2}<%bb>
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%t8 = sext i32 %t7 to i64 ; <i64> [#uses=1]
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; CHECK: %t9 = getelementptr inbounds double* %q, i64 %t8
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; CHECK: {(8 + %q),+,16}<%bb>
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%t9 = getelementptr inbounds double* %q, i64 %t8 ; <double*> [#uses=1]
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%10 = load double* %9, align 8 ; <double> [#uses=1]
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%11 = fadd double %6, %10 ; <double> [#uses=1]
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%12 = fadd double %11, 3.200000e+00 ; <double> [#uses=1]
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%13 = fmul double %3, %12 ; <double> [#uses=1]
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%14 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
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%15 = getelementptr inbounds double* %d, i64 %14 ; <double*> [#uses=1]
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store double %13, double* %15, align 8
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%16 = add nsw i32 %i.01, 2 ; <i32> [#uses=2]
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br label %bb1
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bb1: ; preds = %bb
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%17 = icmp slt i32 %16, %n ; <i1> [#uses=1]
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br i1 %17, label %bb, label %bb1.return_crit_edge
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bb1.return_crit_edge: ; preds = %bb1
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br label %return
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return: ; preds = %bb1.return_crit_edge, %entry
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ret void
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}
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; CHECK: Loop %bb: backedge-taken count is ((-1 + %n) /u 2)
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; CHECK: Loop %bb: max backedge-taken count is 1073741822
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