0f1b5f115a
ptxas is a proprietary compiler from Nvidia that can compile PTX to machine code (SASS). It has a lot of diagnostics to catch errors in PTX, which can be used to verify PTX output from llc. Set -DPXTAS_EXECUTABLE=/path/to/ptxas CMake option to enable it. If this option is not set, then ptxas is substituted to true which effectively disables all ptxas RUN lines. LLVM_PTXAS_EXECUTABLE environment variable takes precedence over the CMake option, and allows to override ptxas executable that is used for LIT without complete re-configuration. Differential Revision: https://reviews.llvm.org/D121727
68 lines
2.5 KiB
LLVM
68 lines
2.5 KiB
LLVM
; RUN: llc < %s -march=nvptx64 -mcpu=sm_20 | FileCheck %s
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; RUN: %if ptxas %{ llc < %s -march=nvptx64 -mcpu=sm_20 | %ptxas-verify %}
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; Checks how NVPTX lowers alloca buffers and their passing to functions.
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;
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; Produced with the following CUDA code:
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; extern "C" __attribute__((device)) void callee(float* f, char* buf);
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;
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; extern "C" __attribute__((global)) void kernel_func(float* a) {
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; char buf[4 * sizeof(float)];
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; *(reinterpret_cast<float*>(&buf[0])) = a[0];
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; *(reinterpret_cast<float*>(&buf[1])) = a[1];
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; *(reinterpret_cast<float*>(&buf[2])) = a[2];
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; *(reinterpret_cast<float*>(&buf[3])) = a[3];
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; callee(a, buf);
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; }
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; CHECK: .visible .entry kernel_func
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define void @kernel_func(float* %a) {
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entry:
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%buf = alloca [16 x i8], align 4
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; CHECK: .local .align 4 .b8 __local_depot0[16]
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; CHECK: mov.u64 %SPL
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; CHECK: ld.param.u64 %rd[[A_REG:[0-9]+]], [kernel_func_param_0]
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; CHECK: cvta.to.global.u64 %rd[[A1_REG:[0-9]+]], %rd[[A_REG]]
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; CHECK: add.u64 %rd[[SP_REG:[0-9]+]], %SP, 0
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; CHECK: ld.global.f32 %f[[A0_REG:[0-9]+]], [%rd[[A1_REG]]]
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; CHECK: st.local.f32 [{{%rd[0-9]+}}], %f[[A0_REG]]
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%0 = load float, float* %a, align 4
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%1 = bitcast [16 x i8]* %buf to float*
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store float %0, float* %1, align 4
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%arrayidx2 = getelementptr inbounds float, float* %a, i64 1
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%2 = load float, float* %arrayidx2, align 4
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%arrayidx3 = getelementptr inbounds [16 x i8], [16 x i8]* %buf, i64 0, i64 1
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%3 = bitcast i8* %arrayidx3 to float*
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store float %2, float* %3, align 4
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%arrayidx4 = getelementptr inbounds float, float* %a, i64 2
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%4 = load float, float* %arrayidx4, align 4
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%arrayidx5 = getelementptr inbounds [16 x i8], [16 x i8]* %buf, i64 0, i64 2
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%5 = bitcast i8* %arrayidx5 to float*
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store float %4, float* %5, align 4
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%arrayidx6 = getelementptr inbounds float, float* %a, i64 3
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%6 = load float, float* %arrayidx6, align 4
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%arrayidx7 = getelementptr inbounds [16 x i8], [16 x i8]* %buf, i64 0, i64 3
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%7 = bitcast i8* %arrayidx7 to float*
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store float %6, float* %7, align 4
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; CHECK: .param .b64 param0;
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; CHECK-NEXT: st.param.b64 [param0+0], %rd[[A_REG]]
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; CHECK-NEXT: .param .b64 param1;
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; CHECK-NEXT: st.param.b64 [param1+0], %rd[[SP_REG]]
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; CHECK-NEXT: call.uni
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; CHECK-NEXT: callee,
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%arraydecay = getelementptr inbounds [16 x i8], [16 x i8]* %buf, i64 0, i64 0
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call void @callee(float* %a, i8* %arraydecay) #2
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ret void
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}
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declare void @callee(float*, i8*)
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!nvvm.annotations = !{!0}
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!0 = !{void (float*)* @kernel_func, !"kernel", i32 1}
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