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Report From: Delphi-BCB/Compiler/Delphi/Code Generation/Optimization [ Add a report in this area ]

Report #: 105561

Status: Open

Not complete optimization: constant propagation.

Project: Delphi

Build #: 16.0.4429.46931

Version: 16.4

Submitted By: Denis Volodarsky

Report Type: Suggestion / Enhancement Request

Date Reported: 5/12/2012 11:17:07 PM

Severity: Infrequently encountered problem

Last Updated: 8/6/2012 12:47:57 PM

Platform: All versions

Internal Tracking #:

Resolution: None (Resolution Comments)

Resolved in Build: : None

Duplicate of: None

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Description

Example function:

function test: integer;
begin
  result := 10;
  result := result + 1 + 2 + 3;
  result := result + 1 + 2 + 3;
  result := result + 1 + 2 + 3;
end;

This example generates such asm code (release mode):
mov eax, 10
add eax, 6
add eax, 6
add eax, 6
i.e. it's obviously folds constants at lines, but not propagates result futrher.

final code should be just
mov eax, 28

Steps to Reproduce:

None

Workarounds

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