Test source: git
Source: <stdin>
----------------------------------------
define i32 @shuf_4bytes(<4 x i8> %x) {
%0:
%bswap = shufflevector <4 x i8> %x, <4 x i8> poison, 3, 2, 1, 0
%cast = bitcast <4 x i8> %bswap to i32
ret i32 %cast
}
=>
define i32 @shuf_4bytes(<4 x i8> %x) {
%0:
%1 = bitcast <4 x i8> %x to i32
%cast = bswap i32 %1
ret i32 %cast
}
Transformation seems to be correct!
----------------------------------------
define i32 @shuf_load_4bytes(* %p) {
%0:
%x = load <4 x i8>, * %p, align 4
%bswap = shufflevector <4 x i8> %x, <4 x i8> poison, 3, 2, 4294967295, 0
%cast = bitcast <4 x i8> %bswap to i32
ret i32 %cast
}
=>
define i32 @shuf_load_4bytes(* %p) {
%0:
%1 = bitcast * %p to *
%x1 = load i32, * %1, align 4
%cast = bswap i32 %x1
ret i32 %cast
}
Transformation doesn't verify!
ERROR: Target is more poisonous than source
Example:
* %p = pointer(non-local, block_id=1, offset=0)
Source:
<4 x i8> %x = < #x00 (0), poison, #x00 (0), #x00 (0) >
<4 x i8> %bswap = < #x00 (0), #x00 (0), any, #x00 (0) >
i32 %cast = #x00000000 (0) [based on undef value]
SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 > size: 0 align: 4 alloc type: 0
Block 1 > size: 8 align: 4 alloc type: 0
Target:
* %1 = pointer(non-local, block_id=1, offset=0)
i32 %x1 = poison
i32 %cast = poison
Source value: #x00000000 (0)
Target value: poison
------------------- SMT STATS -------------------
Num queries: 8
Num invalid: 0
Num skips: 0
Num trivial: 16 (66.7%)
Num timeout: 0 (0.0%)
Num errors: 0 (0.0%)
Num SAT: 4 (50.0%)
Num UNSAT: 4 (50.0%)
Alive2: Transform doesn't verify; aborting!
+ : 'RUN: at line 2' + /home/nlopes/alive2/build/opt-alive.sh -instcombine -S + /home/nlopes/llvm/build/bin/FileCheck /home/nlopes/llvm/llvm/test/Transforms/InstCombine/bswap-inseltpoison.ll FileCheck error: '<stdin>' is empty. FileCheck command line: /home/nlopes/llvm/build/bin/FileCheck /home/nlopes/llvm/llvm/test/Transforms/InstCombine/bswap-inseltpoison.ll