http://llvm.org/bugs/show_bug.cgi?id=21048
Bug ID: 21048
Summary: initialization of global var with a (sqrt) function
optimized away
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 13078
--> http://llvm.org/bugs/attachment.cgi?id=13078&action=edit
test source
The initialization of a double to NaN (by way of sqrt(-2.01)) is failing, due
to the sqrt call being optimized out.
Per debug, this appears to be occurring during the "Early CSE" pass.
opt -O1 -S -o optimized.ll llvm_debug_variable_init.ll
The llvm_debug_variable_init.ll file contains a snippet including:
define void @__cxx_global_var_init() section ".text.startup" {
entry:
%0 = call double @llvm.sqrt.f64(double -2.010000e+00), !dbg !1818
store double %0, double* getelementptr inbounds (%"NumberUnion"* @fruity ,
i32 0, i32 0), align 8, !dbg !1818
ret void, !dbg !1818
}
The optimized.ll output contains:
define void @__cxx_global_var_init() #0 section ".text.startup" {
entry:
store double 0.000000e+00, double* getelementptr inbounds (%NumberUnion*
@fruity, i64 0, i32 0), align 8
ret void
}
... with no sign of the sqrt call.
output from
"opt llvm_debug_variable_init.ll -O1 -S --print-after-all --print-before-all
> optimized_debug.ll 2>&1 " will also be attached momentarily.
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