https://bugs.llvm.org/show_bug.cgi?id=45475
Bug ID: 45475
Summary: [PPC] wrong code generated for ppc_fp128 sign testing
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: PowerPC
Assignee: unassignedb...@nondot.org
Reporter: car...@google.com
CC: llvm-bugs@lists.llvm.org, nemanja.i....@gmail.com
Compile the following code with command line
llc --mtriple=powerpc64le-grtev4-linux-gnu t.ll
define zeroext i1 @ppc128(ppc_fp128 %fp) {
%v128 = bitcast ppc_fp128 %fp to i128
%low = trunc i128 %v128 to i64
%shift = lshr i128 %v128, 64
%high = trunc i128 %shift to i64
%c = icmp slt i64 %high, 0 // %c = icmp slt i64 %low, 0
ret i1 %c
}
LLVM generates:
li 3, 0
blr
If I testing the sign of the %low part as in comment, llvm generates the same
code.
In both cases I expect llvm generate bit extraction instructions.
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