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Bug 21527 – Unnecessary store to memory in SIMD code

Status: RESOLVED
Resolution: FIXED
Severity: enhancement
Priority: P1
Component: dmd
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2021-01-06T10:57:36Z
Last change time: 2021-01-06T11:52:53Z
Keywords: backend, performance, pull, SIMD
Assigned to: No Owner
Creator: Walter Bright

Comments

Comment #0 by bugzilla — 2021-01-06T10:57:36Z

The following code: float f(float a, float b) { float c = a + b; float d = c - b; return d; } unnecessarily stores c into memory when it could be left in an XMM register. Compile with -m32 -O.

Comment #1 by dlang-bot — 2021-01-06T11:01:16Z

@WalterBright created dlang/dmd pull request #12103 "fix Issue 21527 - Unnecessary store to memory in SIMD code" fixing this issue: - fix Issue 21527 - Unnecessary store to memory in SIMD code https://github.com/dlang/dmd/pull/12103

Comment #2 by dlang-bot — 2021-01-06T11:52:53Z

dlang/dmd pull request #12103 "fix Issue 21527 - Unnecessary store to memory in SIMD code" was merged into master: - 4de894dcd8022925132674643c47d2108443765f by Walter Bright: fix Issue 21527 - Unnecessary store to memory in SIMD code https://github.com/dlang/dmd/pull/12103