http://llvm.org/bugs/show_bug.cgi?id=17784
Bug ID: 17784
Summary: Large contant materialized twice
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
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
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