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https://github.com/c64scene-ar/llvm-6502.git
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a112087e42
This allows us to compile "int cst[] = {-1, -1, -1};" into
movl $-1, 16(%rsp)
movq $-1, 8(%rsp)
instead of
movl _cst+8(%rip), %eax
movl %eax, 16(%rsp)
movq _cst(%rip), %rax
movq %rax, 8(%rsp)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122548 91177308-0d34-0410-b5e6-96231b3b80d8
20 lines
696 B
LLVM
20 lines
696 B
LLVM
; RUN: opt -memcpyopt -S < %s | FileCheck %s
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@cst = internal constant [3 x i32] [i32 -1, i32 -1, i32 -1], align 4
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
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declare void @foo(i32*) nounwind
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define void @test1() nounwind {
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%arr = alloca [3 x i32], align 4
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%arr_i8 = bitcast [3 x i32]* %arr to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %arr_i8, i8* bitcast ([3 x i32]* @cst to i8*), i64 12, i32 4, i1 false)
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%arraydecay = getelementptr inbounds [3 x i32]* %arr, i64 0, i64 0
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call void @foo(i32* %arraydecay) nounwind
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ret void
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; CHECK: @test1
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; CHECK: call void @llvm.memset
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; CHECK-NOT: call void @llvm.memcpy
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; CHECK: ret void
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}
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