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Diffstat (limited to 'llvm/docs/AMDGPUUsage.rst')
| -rw-r--r-- | llvm/docs/AMDGPUUsage.rst | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/llvm/docs/AMDGPUUsage.rst b/llvm/docs/AMDGPUUsage.rst index c5b9bd9..1935763 100644 --- a/llvm/docs/AMDGPUUsage.rst +++ b/llvm/docs/AMDGPUUsage.rst @@ -1844,6 +1844,20 @@ The AMDGPU backend supports the following calling conventions: ..TODO:: Describe. + ``amdgpu_gfx_whole_wave`` Used for AMD graphics targets. Functions with this calling convention + cannot be used as entry points. They must have an i1 as the first argument, + which will be mapped to the value of EXEC on entry into the function. Other + arguments will contain poison in their inactive lanes. Similarly, the return + value for the inactive lanes is poison. + + The function will run with all lanes enabled, i.e. EXEC will be set to -1 in the + prologue and restored to its original value in the epilogue. The inactive lanes + will be preserved for all the registers used by the function. Active lanes only + will only be preserved for the callee saved registers. + + In all other respects, functions with this calling convention behave like + ``amdgpu_gfx`` functions. + ``amdgpu_gs`` Used for Mesa/AMDPAL geometry shaders. ..TODO:: Describe. |