[all-commits] [llvm/llvm-project] 1cdcee: [HLSL][Matrix] Make matrix truncation respect defa...

[Deric C. via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1cdcee267c8d03064b887488ed00d78c4775b365
      https://github.com/llvm/llvm-project/commit/1cdcee267c8d03064b887488ed00d78c4775b365
  Author: Deric C. <cheung.deric at gmail.com>
  Date:   2026-03-06 (Fri, 06 Mar 2026)

  Changed paths:
    M clang/lib/CodeGen/CGExprScalar.cpp
    M clang/test/CodeGenHLSL/BasicFeatures/MatrixExplicitTruncation.hlsl
    M clang/test/CodeGenHLSL/BasicFeatures/MatrixImplicitTruncation.hlsl

  Log Message:
  -----------
  [HLSL][Matrix] Make matrix truncation respect default matrix memory layout (#184280)

Fixes #183127 and #184371

This PR makes the matrix truncation cast implementation use the new
matrix flattened index helper functions introduced by #182904 so that it
reads elements from the source matrix using the default matrix memory
layout instead of always assuming column-major order.

This PR also fixes a bug where matrix truncation truncated the wrong
elements.

Assisted-by: claude-opus-4.6



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