[PATCH] D75179: [AMDGPU][ConstantFolding] Fold llvm.amdgcn.fract intrinsic

[Jay Foad via Phabricator via llvm-commits]

foad marked an inline comment as done.
foad added inline comments.


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Comment at: llvm/lib/Analysis/ConstantFolding.cpp:1797
+    if (IntrinsicID == Intrinsic::amdgcn_fract) {
+      // TODO what should amdgcn_fract return for tiny negative arguments?
+      // GLSL defines fract(x) as x - floor(x).
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arsenm wrote:
> This should match the instruction behavior (although I guess we can ignore the bug on SI)
Is there a good public reference for that? The Vega ISA Reference Guide doesn't go into much detail.


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https://reviews.llvm.org/D75179