61 lines
1.7 KiB
LLVM
61 lines
1.7 KiB
LLVM
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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; Instcombine should be able to prove vector alignment in the
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; presence of a few mild address computation tricks.
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; CHECK: @test0(
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; CHECK: align 16
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define void @test0(i8* %b, i64 %n, i64 %u, i64 %y) nounwind {
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entry:
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%c = ptrtoint i8* %b to i64
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%d = and i64 %c, -16
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%e = inttoptr i64 %d to double*
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%v = mul i64 %u, 2
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%z = and i64 %y, -2
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%t1421 = icmp eq i64 %n, 0
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br i1 %t1421, label %return, label %bb
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bb:
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%i = phi i64 [ %indvar.next, %bb ], [ 20, %entry ]
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%j = mul i64 %i, %v
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%h = add i64 %j, %z
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%t8 = getelementptr double* %e, i64 %h
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%p = bitcast double* %t8 to <2 x double>*
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store <2 x double><double 0.0, double 0.0>, <2 x double>* %p, align 8
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%indvar.next = add i64 %i, 1
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%exitcond = icmp eq i64 %indvar.next, %n
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br i1 %exitcond, label %return, label %bb
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return:
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ret void
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}
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; When we see a unaligned load from an insufficiently aligned global or
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; alloca, increase the alignment of the load, turning it into an aligned load.
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; CHECK: @test1(
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; CHECK: tmp = load
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; CHECK: GLOBAL{{.*}}align 16
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@GLOBAL = internal global [4 x i32] zeroinitializer
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define <16 x i8> @test1(<2 x i64> %x) {
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entry:
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%tmp = load <16 x i8>* bitcast ([4 x i32]* @GLOBAL to <16 x i8>*), align 1
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ret <16 x i8> %tmp
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}
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; When a load or store lacks an explicit alignment, add one.
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; CHECK: @test2(
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; CHECK: load double* %p, align 8
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; CHECK: store double %n, double* %p, align 8
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define double @test2(double* %p, double %n) nounwind {
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%t = load double* %p
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store double %n, double* %p
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ret double %t
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}
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