llvm-6502/test/Transforms/SimplifyCFG/PhiEliminate.ll
2004-03-30 19:45:39 +00:00

38 lines
1.0 KiB
LLVM

; Test a bunch of cases where the cfg simplification code should
; be able to fold PHI nodes into computation in common cases. Folding the PHI
; nodes away allows the branches to be eliminated, performing a simple form of
; 'if conversion'.
; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis > %t.xform
; RUN: not grep phi %t.xform && grep ret %t.xform
declare void %use(bool)
declare void %use(int)
void %test(bool %c, int %V, int %V2) {
br bool %c, label %T, label %F
T:
br label %F
F:
%B1 = phi bool [true, %0], [false, %T]
%B2 = phi bool [true, %T], [false, %0]
%I1 = phi int [1, %T], [0, %0]
%I2 = phi int [1, %0], [0, %T]
%I3 = phi int [17, %T], [0, %0]
%I4 = phi int [17, %T], [5, %0]
%I5 = phi int [%V, %T], [0, %0]
%I6 = phi int [%V, %0], [0, %T]
%I7 = phi int [%V, %0], [%V2, %T]
call void %use(bool %B1)
call void %use(bool %B2)
call void %use(int %I1)
call void %use(int %I2)
call void %use(int %I3)
call void %use(int %I4)
call void %use(int %I5)
call void %use(int %I6)
call void %use(int %I7)
ret void
}