http://llvm.org/bugs/show_bug.cgi?id=3299
Summary: LLVM optimizer can't eliminate loop with floating point
counter
Product: libraries
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P2
Component: Loop Optimizer
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
LLVM optimizer fails to eliminate following dead loop with floating point
counter.
(The exception is that i is incremented by 1.0f)
/* floop.c */
void
func() {
float i;
for (i = 0.0f; i < 1000.0f; i += 1.2f) {
}
}
$ clang -emit-llvm-bc floop.c
$ opt -std-compile-opts floop.bc | llvm-dis
opt -std-compile-opts test.bc | llvm-dis
; ModuleID = '<stdin>'
target datalayout =
"e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin9"
define void @func(...) nounwind readnone {
entry:
br label %for.inc
for.inc: ; preds = %for.inc, %entry
%i.0.reg2mem.0 = phi float [ 0.000000e+00, %entry ], [ %add, %for.inc
]; <float> [#uses=1]
%add = add float %i.0.reg2mem.0, 0x3FF3333340000000 ;
<float> [#uses=2]
%cmp = fcmp olt float %add, 1.000000e+03 ; <i1>
[#uses=1]
br i1 %cmp, label %for.inc, label %return
return: ; preds = %for.inc
ret void
}
(loop wasn't eliminated after optimization)
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