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llvm-mirror/test/Transforms/InstCombine/add2.ll
Chris Lattner 510a6b249c be more aggressive about transforming add -> or when the operands have no
intersecting bits.  This triggers all over the place, for example in lencode,
with adds of stuff like:

	%tmp580 = mul i32 %tmp579, 2	
	%tmp582 = and i32 %b8, 1
and

	%tmp28 = shl i32 %abs.i, 1		
	%sign.0 = select i1 %tmp23, i32 1, i32 0
and
	%tmp344 = shl i32 %tmp343, 2	
	%tmp346 = and i32 %tmp96, 3

etc.

llvm-svn: 51263
2008-05-19 20:01:56 +00:00

47 lines
1.1 KiB
LLVM

; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \
; RUN: grep -v OK | not grep add
;; Target triple for gep raising case below.
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 = "i686-apple-darwin8"
define i64 @test1(i64 %A, i32 %B) {
%tmp12 = zext i32 %B to i64
%tmp3 = shl i64 %tmp12, 32
%tmp5 = add i64 %tmp3, %A
%tmp6 = and i64 %tmp5, 123
ret i64 %tmp6
}
; PR1795
define void @test2(i32 %.val24) {
EntryBlock:
add i32 %.val24, -12
inttoptr i32 %0 to i32*
store i32 1, i32* %1
add i32 %.val24, -16
inttoptr i32 %2 to i32*
getelementptr i32* %3, i32 1
load i32* %4
tail call i32 @callee( i32 %5 )
ret void
}
declare i32 @callee(i32)
define i32 @test3(i32 %A) {
%B = and i32 %A, 7
%C = and i32 %A, 32
%F = add i32 %B, %C
ret i32 %F
}
define i32 @test4(i32 %A) {
%B = and i32 %A, 128
%C = lshr i32 %A, 30
%F = add i32 %B, %C
ret i32 %F
}