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Large constant materialized twice #18158

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llvmbot opened this issue Nov 2, 2013 · 2 comments
Closed

Large constant materialized twice #18158

llvmbot opened this issue Nov 2, 2013 · 2 comments
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bugzilla Issues migrated from bugzilla llvm:codegen

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@llvmbot
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llvmbot commented Nov 2, 2013

Bugzilla Link 17784
Version trunk
OS All
Reporter LLVM Bugzilla Contributor

Extended Description

Given

#include <stdint.h>
uint64_t val, *p;
extern uint64_t xtr( uint64_t);

uint64_t caller() {
uint64_t x;
p = &val;
x = 12345123400L;
*p = x;
return xtr(x);
}

clang produces

movq	%rax, (%rcx)
movabsq	$12345123400, %rcx      ## imm = 0x2DFD3A248
movq	%rcx, (%rax)
movabsq	$12345123400, %rdi      ## imm = 0x2DFD3A248

There was a thread about this bug in:

http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-August/064535.html
@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 9, 2021
@JOE1994
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JOE1994 commented Dec 2, 2023

With clang trunk, large constant is no longer materialized twice.

@JOE1994 JOE1994 closed this as completed Dec 2, 2023
@fhahn
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fhahn commented Dec 2, 2023

Thanks for checking and closing!

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@fhahn @JOE1994 @llvmbot