I'm not 100% sure if the title is the real cause but the following code crashes: <

This is a duplicate of <a class="issue-link js-issue-link" data-error-text="Failed to

That's in druntime, I was hitting it in <d

[x86] segmentation fault with aligned struct parameters about ldc HOT 5 CLOSED

the-horo commented on August 26, 2024

[x86] segmentation fault with aligned struct parameters

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Comments (5)

kinke commented on August 26, 2024

This is a duplicate of #1356; see in particular #1356 (comment).

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kinke commented on August 26, 2024

You do have this existing workaround, right?

ldc/runtime/druntime/src/core/int128.d

Lines 37 to 40 in e170ca5

 version (X86_64) private enum Cent_alignment = 16; 

 // 32-bit x86: need default alignment due to https://github.com/ldc-developers/ldc/issues/1356 

 else version (LDC_X86) private enum Cent_alignment = U.alignof; 

 else private enum Cent_alignment = (size_t.sizeof * 2);

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the-horo commented on August 26, 2024

That's in druntime, I was hitting it in

ldc/dmd/common/int128.d

Lines 23 to 27 in e170ca5

 align(16) struct Cent 

 { 

 U lo; // low 64 bits 

 U hi; // high 64 bits 

 }

which I found out by running ldc2-unittest on x86 when compiling with another ldc2 installation.

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kinke commented on August 26, 2024

Ah okay, that 'copy'. It's unused, except for ldc2-unittest.

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the-horo commented on August 26, 2024

Alright then, if it's unused and the underlying issue was already reported then I can ignore it. Thank you again for your help.

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[x86] segmentation fault with aligned struct parameters about ldc HOT 5 CLOSED

Comments (5)

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	version (X86_64) private enum Cent_alignment = 16;
	// 32-bit x86: need default alignment due to https://github.com/ldc-developers/ldc/issues/1356
	else version (LDC_X86) private enum Cent_alignment = U.alignof;
	else private enum Cent_alignment = (size_t.sizeof * 2);

	align(16) struct Cent
	{
	U lo; // low 64 bits
	U hi; // high 64 bits
	}