http://llvm.org/bugs/show_bug.cgi?id=14032
Bug #: 14032
Summary: Missed optimization: could form GEP of nicer type
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
The following kind of thing is produced by dragonegg from GCC's "pointer-plus
expression". The whole function could be turned into something like this:
%pp = getelementptr inbounds double* %p, i64 %i
%l = load double* %pp
by the optimizers, but it isn't. Testcase:
target datalayout =
"e-p:64:64:64-S128-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f16:16:16-f32:32:32-f64:64:64-f128:128:128-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
define double @foo(double *%p, i64 %i) {
%o = mul i64 %i, 8
%q = bitcast double* %p to i8*
%pp = getelementptr inbounds i8* %q, i64 %o
%r = bitcast i8* %pp to double*
%l = load double* %r
ret double %l
}
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