llvm-6502/test/Transforms/InstCombine/dce-iterate.ll
Dan Gohman ae3a0be92e Split the Add, Sub, and Mul instruction opcodes into separate
integer and floating-point opcodes, introducing
FAdd, FSub, and FMul.

For now, the AsmParser, BitcodeReader, and IRBuilder all preserve
backwards compatability, and the Core LLVM APIs preserve backwards
compatibility for IR producers. Most front-ends won't need to change
immediately.

This implements the first step of the plan outlined here:
http://nondot.org/sabre/LLVMNotes/IntegerOverflow.txt


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72897 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-04 22:49:04 +00:00

25 lines
1.3 KiB
LLVM

; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret double .sy}
define internal double @ScaleObjectAdd(double %sx, double %sy, double %sz) nounwind {
entry:
%sx34 = bitcast double %sx to i64 ; <i64> [#uses=1]
%sx3435 = zext i64 %sx34 to i960 ; <i960> [#uses=1]
%sy22 = bitcast double %sy to i64 ; <i64> [#uses=1]
%sy2223 = zext i64 %sy22 to i960 ; <i960> [#uses=1]
%sy222324 = shl i960 %sy2223, 320 ; <i960> [#uses=1]
%sy222324.ins = or i960 %sx3435, %sy222324 ; <i960> [#uses=1]
%sz10 = bitcast double %sz to i64 ; <i64> [#uses=1]
%sz1011 = zext i64 %sz10 to i960 ; <i960> [#uses=1]
%sz101112 = shl i960 %sz1011, 640 ; <i960> [#uses=1]
%sz101112.ins = or i960 %sy222324.ins, %sz101112
%a = trunc i960 %sz101112.ins to i64 ; <i64> [#uses=1]
%b = bitcast i64 %a to double ; <double> [#uses=1]
%c = lshr i960 %sz101112.ins, 320 ; <i960> [#uses=1]
%d = trunc i960 %c to i64 ; <i64> [#uses=1]
%e = bitcast i64 %d to double ; <double> [#uses=1]
%f = fadd double %b, %e
ret double %e
}