[PATCH] TargetLowering: n * r where n > 2 should be an illegal addressing mode

[Tom Stellard]

On Thu, Feb 13, 2014 at 08:21:04AM -0800, Tom Stellard wrote:
> From: Tom Stellard <thomas.stellard at amd.com>
> 

Please ignore this patch.  Scaled addressing modes are more
common than I though, so I don't think this is correct.

-Tom

> ---
>  lib/CodeGen/TargetLoweringBase.cpp                 |  2 ++
>  test/CodeGen/R600/codegen-prepare-addrmode-sext.ll | 18 ++++++++++++++++++
>  2 files changed, 20 insertions(+)
>  create mode 100644 test/CodeGen/R600/codegen-prepare-addrmode-sext.ll
> 
> diff --git a/lib/CodeGen/TargetLoweringBase.cpp b/lib/CodeGen/TargetLoweringBase.cpp
> index beaa9b9..00b551b 100644
> --- a/lib/CodeGen/TargetLoweringBase.cpp
> +++ b/lib/CodeGen/TargetLoweringBase.cpp
> @@ -1420,6 +1420,8 @@ bool TargetLoweringBase::isLegalAddressingMode(const AddrMode &AM,
>        return false;
>      // Allow 2*r as r+r.
>      break;
> +  default: // Don't allow n * r
> +    return false;
>    }
>  
>    return true;
> diff --git a/test/CodeGen/R600/codegen-prepare-addrmode-sext.ll b/test/CodeGen/R600/codegen-prepare-addrmode-sext.ll
> new file mode 100644
> index 0000000..226f8e5
> --- /dev/null
> +++ b/test/CodeGen/R600/codegen-prepare-addrmode-sext.ll
> @@ -0,0 +1,18 @@
> +; RUN: opt -codegenprepare -S -o - %s | FileCheck %s
> +
> +target datalayout = "e-p:32:32-p1:64:64-p2:64:64-p3:32:32-p4:32:32-p5:64:64-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64"
> +target triple = "r600--"
> +
> +; XFAIL: *
> +
> +; CHECK-LABEL: @test
> +; CHECK: mul
> +; CHECK-NEXT: sext
> +define void @test(i8 addrspace(1)* nocapture readonly %in, i32 %a, i8 %b) {
> +entry:
> +  %0 = mul nsw i32 %a, 3
> +  %1 = sext i32 %0 to i64
> +  %2 = getelementptr i8 addrspace(1)* %in, i64 %1
> +  store i8 %b, i8 addrspace(1)* %2
> +  ret void
> +}
> -- 
> 1.8.1.5
> 
> _______________________________________________
> llvm-commits mailing list
> llvm-commits at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits