mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
19 lines
806 B
LLVM
19 lines
806 B
LLVM
; This file contains various testcases that check to see that instcombine
|
|
; is narrowing computations when possible.
|
|
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | \
|
|
; RUN: grep {ret i1 false}
|
|
|
|
; test1 - Eliminating the casts in this testcase (by narrowing the AND
|
|
; operation) allows instcombine to realize the function always returns false.
|
|
;
|
|
define i1 @test1(i32 %A, i32 %B) {
|
|
%C1 = icmp slt i32 %A, %B ; <i1> [#uses=1]
|
|
%ELIM1 = zext i1 %C1 to i32 ; <i32> [#uses=1]
|
|
%C2 = icmp sgt i32 %A, %B ; <i1> [#uses=1]
|
|
%ELIM2 = zext i1 %C2 to i32 ; <i32> [#uses=1]
|
|
%C3 = and i32 %ELIM1, %ELIM2 ; <i32> [#uses=1]
|
|
%ELIM3 = trunc i32 %C3 to i1 ; <i1> [#uses=1]
|
|
ret i1 %ELIM3
|
|
}
|
|
|