https://bugs.llvm.org/show_bug.cgi?id=34647
Bug ID: 34647
Summary: llc version 4.0 and later takes up to 45 times as long
to compile shader code for Mesa
Product: new-bugs
Version: 4.0
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: bcroc...@redhat.com
CC: llvm-bugs@lists.llvm.org
Created attachment 19167
--> https://bugs.llvm.org/attachment.cgi?id=19167&action=edit
Vertex shader bytecode
The Piglit (OpenGL test suite) ext_transform_feedback-max-varyings test
utilizes somewhat unusual shader programs (both vertex and fragment shaders).
The llc compiler prior to 4.0 compiled these programs in
not-unacceptable times of 0.078 seconds for a representative
vertex shader and 2.6-4.5 seconds for a representative fragment shader.
The V4.0 and later llc takes a MUCH longer time to compile the same
code: 1.66 seconds for the vertex shader (a factor of 20 times slower!)
and 1 minute 55 seconds for the fragment shader (a factor of 25-45 times
slower!).
I will attach sample vertex shader code (ir_draw_llvm_vs_variant0.bc)
and fragment shader code (ir_fs914_variant0.bc).
The target architecture is PPC64LE.
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