llvm-6502/test/Transforms/InstCombine/mul.ll
Chris Lattner 19e40ade3d Handle the unsigned form as well
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11739 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23 06:37:33 +00:00

75 lines
1.3 KiB
LLVM

; This test makes sure that mul instructions are properly eliminated.
;
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep mul
implementation
int %test1(int %A) {
%B = mul int %A, 1
ret int %B
}
int %test2(int %A) {
%B = mul int %A, 2 ; Should convert to an add instruction
ret int %B
}
int %test3(int %A) {
%B = mul int %A, 0 ; This should disappear entirely
ret int %B
}
double %test4(double %A) {
%B = mul double 1.0, %A ; This is safe for FP
ret double %B
}
int %test5(int %A) {
%B = mul int %A, 8
ret int %B
}
ubyte %test6(ubyte %A) {
%B = mul ubyte %A, 8
%C = mul ubyte %B, 8
ret ubyte %C
}
int %test7(int %i) {
%tmp = mul int %i, -1 ; %tmp = sub 0, %i
ret int %tmp
}
ulong %test8(ulong %i) {
%j = mul ulong %i, 18446744073709551615 ; tmp = sub 0, %i
ret ulong %j
}
uint %test9(uint %i) {
%j = mul uint %i, 4294967295 ; %j = sub 0, %i
ret uint %j
}
uint %test10(int %a, uint %b) {
%c = setlt int %a, 0
%d = cast bool %c to uint
%e = mul uint %d, %b ; e = b & (a >> 31)
ret uint %e
}
uint %test11(int %a, uint %b) {
%c = setle int %a, -1
%d = cast bool %c to uint
%e = mul uint %d, %b ; e = b & (a >> 31)
ret uint %e
}
uint %test11(ubyte %a, uint %b) {
%c = setgt ubyte %a, 127
%d = cast bool %c to uint
%e = mul uint %d, %b ; e = b & (a >> 31)
ret uint %e
}