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eee962e1ce
in addition to integer expressions. Rewrite GetOrEnforceKnownAlignment as a ComputeMaskedBits problem, moving all of its special alignment knowledge to ComputeMaskedBits as low-zero-bits knowledge. Also, teach ComputeMaskedBits a few basic things about Mul and PHI instructions. This improves ComputeMaskedBits-based simplifications in a few cases, but more noticeably it significantly improves instcombine's alignment detection for loads, stores, and memory intrinsics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49492 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1.4 KiB
LLVM
44 lines
1.4 KiB
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {align 16} | count 1
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; A multi-dimensional array in a nested loop doing vector stores that
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; aren't yet aligned. Instcombine can understand the addressing in the
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; Nice case to prove 16 byte alignment. In the Awkward case, the inner
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; array dimension is not even, so the stores to it won't always be
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; aligned. Instcombine should prove alignment in exactly one of the two
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; stores.
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@Nice = global [1001 x [20000 x double]] zeroinitializer, align 32
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@Awkward = global [1001 x [20001 x double]] zeroinitializer, align 32
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define void @foo() nounwind {
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entry:
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br label %bb7.outer
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bb7.outer:
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%i = phi i64 [ 0, %entry ], [ %indvar.next26, %bb11 ]
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br label %bb1
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bb1:
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%j = phi i64 [ 0, %bb7.outer ], [ %indvar.next, %bb1 ]
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%t4 = getelementptr [1001 x [20000 x double]]* @Nice, i64 0, i64 %i, i64 %j
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%q = bitcast double* %t4 to <2 x double>*
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store <2 x double><double 0.0, double 0.0>, <2 x double>* %q, align 8
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%s4 = getelementptr [1001 x [20001 x double]]* @Awkward, i64 0, i64 %i, i64 %j
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%r = bitcast double* %s4 to <2 x double>*
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store <2 x double><double 0.0, double 0.0>, <2 x double>* %r, align 8
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%indvar.next = add i64 %j, 2
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%exitcond = icmp eq i64 %indvar.next, 557
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br i1 %exitcond, label %bb11, label %bb1
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bb11:
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%indvar.next26 = add i64 %i, 1
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%exitcond27 = icmp eq i64 %indvar.next26, 991
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br i1 %exitcond27, label %return.split, label %bb7.outer
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return.split:
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ret void
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}
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